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Articles 1 - 25 of 25
Full-Text Articles in Influenza Virus Vaccines
Epidemiology Of Shigella Species And Serotypes In Children: A Retrospective Substudy Of The Mal-Ed Observational Birth Cohort Study, Elizabeth T. Rogawski Mcquade, Jie Liu, Mustafa Mahfuz, Alexandre Havt, Furqan Kabir, Adil Kalam, Fatima Aziz, Sahrish Muneer, Najeeha Talat Iqbal, Zulfiqar Ahmed Bhutta
Epidemiology Of Shigella Species And Serotypes In Children: A Retrospective Substudy Of The Mal-Ed Observational Birth Cohort Study, Elizabeth T. Rogawski Mcquade, Jie Liu, Mustafa Mahfuz, Alexandre Havt, Furqan Kabir, Adil Kalam, Fatima Aziz, Sahrish Muneer, Najeeha Talat Iqbal, Zulfiqar Ahmed Bhutta
Department of Paediatrics and Child Health
Background: Shigellosis is a leading cause of diarrhoea in children globally. We aimed to assess the burden of specific Shigella species and Shigella flexneri serotypes, characterise their clinical syndromes and natural immunity, and evaluate their relevance as causes of diarrhoea and linear growth faltering.
Methods: In the MAL-ED birth cohort study, children younger than 17 days were enrolled from Nov 3, 2009, to Feb 29, 2012, in Bangladesh, Brazil, India, Nepal, Pakistan, Peru, Tanzania, and South Africa and were followed up for 2 years. In this retrospective substudy, we retested Shigella quantitative PCR-positive diarrhoeal and non-diarrhoeal stool samples with molecular …
Omicron Spike Function And Neutralizing Activity Elicited By A Comprehensive Panel Of Vaccines, John E. Bowen, Amin Addetia, Ha V Dang, Cameron Stewart, Jack T. Brown, William K. Sharkey, Kaitlin R. Sprouse, Kumail Ahmed, Asefa Shariq Ansari, Najeeha Talat Iqbal
Omicron Spike Function And Neutralizing Activity Elicited By A Comprehensive Panel Of Vaccines, John E. Bowen, Amin Addetia, Ha V Dang, Cameron Stewart, Jack T. Brown, William K. Sharkey, Kaitlin R. Sprouse, Kumail Ahmed, Asefa Shariq Ansari, Najeeha Talat Iqbal
Department of Paediatrics and Child Health
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron variant of concern comprises several sublineages, with BA.2 and BA.2.12.1 having replaced the previously dominant BA.1 and with BA.4 and BA.5 increasing in prevalence worldwide. We show that the large number of Omicron sublineage spike mutations leads to enhanced angiotensin-converting enzyme 2 (ACE2) binding, reduced fusogenicity, and severe dampening of plasma neutralizing activity elicited by infection or seven clinical vaccines relative to the ancestral virus. Administration of a homologous or heterologous booster based on the Wuhan-Hu-1 spike sequence markedly increased neutralizing antibody titers and breadth against BA.1, BA.2, BA.2.12.1, BA.4, and …
Pneumococcal Carriage In Infants Post-Pcv10 Introduction In Pakistan: Results From Serial Cross-Sectional Surveys, Shahira Shahid, Amala Khan, Muhammad Imran Nisar, Farah Khalid, Muhammad Farrukh Qazi, Sheraz Ahmed, Furqan Kabir, Aneeta Hotwani, Sahrish Muneer, Syed Asad Ali, Anita K. M. Zaidi, Fyezah Jehan
Pneumococcal Carriage In Infants Post-Pcv10 Introduction In Pakistan: Results From Serial Cross-Sectional Surveys, Shahira Shahid, Amala Khan, Muhammad Imran Nisar, Farah Khalid, Muhammad Farrukh Qazi, Sheraz Ahmed, Furqan Kabir, Aneeta Hotwani, Sahrish Muneer, Syed Asad Ali, Anita K. M. Zaidi, Fyezah Jehan
Department of Paediatrics and Child Health
The 10-valent pneumococcal vaccine was introduced in Pakistan's Expanded Program on Immunization (EPI) in 2013 as a 3 + 0 schedule without catchup. We conducted three annual cross-sectional surveys from 2014-2016 to measure vaccine-type (VT) carriage in infants from a rural part of Pakistan. Nasopharyngeal specimens were collected by random sampling of infants from two union councils of Matiari. Samples were then transported to the Infectious Disease Research Laboratory (IDRL) at the Aga Khan University within 6-8 h of collection. Serotypes were established using sequential multiplex PCR. Of the 665 children enrolled across three surveys, 547 were culture-positive for pneumococcus. …
An Epidemiological, Strategic And Response Analysis Of The Covid-19 Pandemic In South Asia: A Population-Based Observational Study, Hafiz Muhammad Salman, Javaria Syed, Atif Riaz, Zouina Sarfraz, Azza Sarfraz, Syed Hashim Abbas Ali Bokhari, Ivan Cherrez Ojeda
An Epidemiological, Strategic And Response Analysis Of The Covid-19 Pandemic In South Asia: A Population-Based Observational Study, Hafiz Muhammad Salman, Javaria Syed, Atif Riaz, Zouina Sarfraz, Azza Sarfraz, Syed Hashim Abbas Ali Bokhari, Ivan Cherrez Ojeda
Department of Paediatrics and Child Health
Introduction: South Asia has had a dynamic response to the ongoing COVID-19 pandemic. The overall burden and response have remained comparable across highly-burdened countries within the South Asian Region.
Methodology: Using a population-based observational design, all eight South Asian countries were analyzed using a step-wise approach. Data were obtained from government websites and publicly-available repositories for population dynamics and key variables.
Results: South Asian countries have a younger average age of their population. Inequitable distribution of resources centered in urban metropolitan cities within South Asia is present. Certain densely populated regions in these countries have better testing and healthcare facilities …
Usability And Acceptability Of A Mobile App For Behavior Change And To Improve Immunization Coverage Among Children In Pakistan: A Mixed-Methods Study, Abdul Momin Kazi, Nazia Ahsan, Waliyah Mughis, Saima Jamal, Raheel Allana, Mehreen Raza, Sahrish Muneer, Muhammad Ayub Khan Mughal, Hussain Kalimuddin, Fareeha Sameen
Usability And Acceptability Of A Mobile App For Behavior Change And To Improve Immunization Coverage Among Children In Pakistan: A Mixed-Methods Study, Abdul Momin Kazi, Nazia Ahsan, Waliyah Mughis, Saima Jamal, Raheel Allana, Mehreen Raza, Sahrish Muneer, Muhammad Ayub Khan Mughal, Hussain Kalimuddin, Fareeha Sameen
Department of Paediatrics and Child Health
Background: Pakistan's immunization uptake rates are still significantly lower than anticipated despite several initiatives. Lack of awareness, forgetting about vaccination schedule, and vaccine misconception/misinformation are a few of the major drivers that mitigate the rates of immunization. The current COVID-19 pandemic emphasizes the importance of immunization. The significant reductions in regular childhood vaccination during pandemic have increased the risk of outbreaks of vaccine-preventable diseases. Concerns among parents over possibly exposing their children to COVID-19 during child visits may have contributed to the reported declines. Innovative and cost-effective mHealth interventions must be implemented in order to address the problem of inadequate …
Respiratory Syncytial Virus-Associated Mortality Among Young Infants In Karachi, Pakistan: A Prospective Postmortem Surveillance Study, Abdul Momin Kazi, Obianuju G. Aguolu, Waliyah Mughis, Nazia Ahsan, Saima Jamal, Ayub Khan, Hanya M. Qureshi, Inci Yildirim, Fauzia A. Malik, Saad B. Omer
Respiratory Syncytial Virus-Associated Mortality Among Young Infants In Karachi, Pakistan: A Prospective Postmortem Surveillance Study, Abdul Momin Kazi, Obianuju G. Aguolu, Waliyah Mughis, Nazia Ahsan, Saima Jamal, Ayub Khan, Hanya M. Qureshi, Inci Yildirim, Fauzia A. Malik, Saad B. Omer
Department of Paediatrics and Child Health
Background: Respiratory syncytial virus (RSV) is an important cause of infant morbidity and mortality and a potential target for maternal immunization strategies. However, data on the role of RSV in young infant deaths in developing countries are limited.
Methods: We conducted a community-based mortality surveillance from August 2018-March 2020 for infants ≤6 months in Karachi, Pakistan. We tested (reverse transcription-polymerase chain reaction) nasopharyngeal swabs from deceased infants for presence of RSV. We performed verbal autopsies and calculated odds of RSV-associated mortality with 95% CIs and used multivariable logistic regression to evaluate associations.
Results: We collected 490 nasopharyngeal specimens from 1280 …
Effectiveness Of Typhoid Conjugate Vaccine Against Culture-Confirmed Salmonella Enterica Serotype Typhi In An Extensively Drug-Resistant Outbreak Setting Of Hyderabad, Pakistan: A Cohort Study, Mohammad Tahir Yousafzai, Sultan Karim, Sonia Qureshi, Abdul Momin Kazi, Hina Memon, Amber Junejo, Zohra Khawaja, Najeeb Ur Rehman, Muhammad Sajid Ansari, Rafey Ali, Heera Mani Lohana, Farah Naz Qamar
Effectiveness Of Typhoid Conjugate Vaccine Against Culture-Confirmed Salmonella Enterica Serotype Typhi In An Extensively Drug-Resistant Outbreak Setting Of Hyderabad, Pakistan: A Cohort Study, Mohammad Tahir Yousafzai, Sultan Karim, Sonia Qureshi, Abdul Momin Kazi, Hina Memon, Amber Junejo, Zohra Khawaja, Najeeb Ur Rehman, Muhammad Sajid Ansari, Rafey Ali, Heera Mani Lohana, Farah Naz Qamar
Department of Paediatrics and Child Health
Background: Salmonella enterica serotype Typhi (S Typhi) is a major public health problem in low-income and middle-income countries. We aimed to investigate the effectiveness and impact of the typhoid conjugate vaccine Typbar-TCV against S Typhi among children in an outbreak setting of extensively drug-resistant (XDR) S Typhi in Pakistan.
Methods: This cohort study was done from Feb 21, 2018, to Dec 31, 2019. A census survey of all households located in the Qasimabad and Latifabad subdistricts of Hyderabad, Pakistan, was done at baseline, and 174 005 households were registered in the census. The Typbar-TCV immunisation campaign was initiated at temporary …
Acceptance Of Covid-19 Vaccine In Pakistan: A Nationwide Cross-Sectional Study, Mohammad Aadil Qamar, Omar Irfan, Rubaid A. Dhillon, Areesh Bhatti, Mir Ibrahim Sajid, Safia Awan, Wajiha Rizwan, Ali Bin Sarwar Zubairi, Zouina Sarfraz, Javaid Ahmed Khan
Acceptance Of Covid-19 Vaccine In Pakistan: A Nationwide Cross-Sectional Study, Mohammad Aadil Qamar, Omar Irfan, Rubaid A. Dhillon, Areesh Bhatti, Mir Ibrahim Sajid, Safia Awan, Wajiha Rizwan, Ali Bin Sarwar Zubairi, Zouina Sarfraz, Javaid Ahmed Khan
Department of Paediatrics and Child Health
Introduction: The coronavirus disease 2019 (COVID-19) vaccine is available across various countries worldwide, with public-private partnerships ensuring all individuals are vaccinated through a phased approach. Irrespective of the geographical spread, several myths pertaining to the COVID-19 vaccine have stemmed, ultimately limiting the national administration of vaccines and rollouts. This study assessed the acceptance of the COVID-19 vaccine among the general public in Pakistan.
Methods: A pre-validated questionnaire was administered from January 2021 to February 2021 to assess the public attitude and acceptance of the COVID-19 vaccine. Logistic regression analyses were run to identify factors associated with the acceptance among the …
Direct And Indirect Effect Of 10 Valent Pneumococcal Vaccine On Nasopharyngeal Carriage In Children Under 2 Years Of Age In Matiari, Pakistan, Muhammad Imran Nisar, Sheraz Ahmed, Fyezah Jehan, Shahira Shahid, Sadia Shakoor, Furqan Kabir, Aneeta Hotwani, Sahrish Munir, Sajid Muhammad, Farah Khalid, Syed Asad Ali, Anita K. M. Zaidi, Najeeha Talat Iqbal
Direct And Indirect Effect Of 10 Valent Pneumococcal Vaccine On Nasopharyngeal Carriage In Children Under 2 Years Of Age In Matiari, Pakistan, Muhammad Imran Nisar, Sheraz Ahmed, Fyezah Jehan, Shahira Shahid, Sadia Shakoor, Furqan Kabir, Aneeta Hotwani, Sahrish Munir, Sajid Muhammad, Farah Khalid, Syed Asad Ali, Anita K. M. Zaidi, Najeeha Talat Iqbal
Department of Paediatrics and Child Health
Background: Pakistan introduced Ten-valent pneumococcal-conjugate-vaccine PCV10 in 2012 as a 3 + 0 schedule without catch-up.
Methods: Children <2 years old in Matiari, Sindh provided nasopharyngeal swabs between 2014 and 2018, which were cultured for pneumococcus and serotyped through multiplex PCR at the Aga Khan University Hospital. Carriage rates over time for Vaccine-Type (VT) and Non-VT (NVT) serotypes were used to estimate direct, indirect, total and overall effects of vaccination. Regression analysis was used to determine factors associated with VT carriage.
Results: Pneumococcus was detected in 2370/3140 (75%). VT carriage decreased overall, 16.1-9.6% (p-trend <0.001); vaccinated (all 3 doses of PCV10 received) 11.3-8.1% (p-trend 0.031) and unvaccinated (no PCV10 dose received) 17.4-10.3% (p-trend 0.003) with a decline in serotypes 6B, 9V/9A and 19F. Immunization increased from 41.0% to 68.4% (p-trend 0.001). Direct effect of vaccine was 32.8% (95% CI 14.7-47.0%) and indirect effect 44.6%(95% CI 40.6-48.6%). Factors associated with decreased VT colonization were education 1-5 years (aOR 0.7, 95%CI 0.6-1.0), history of difficulty breathing (aOR 0.7, 95%CI 0.5-1.0), exposure to smoke (aOR 0.8, 95% CI 0.6-1.0), child fully immunized (aOR 0.7, 95%CI 0.5-1.0) and enrolled in 3rd (aOR 0.6, 95%CI 0.4-0.8) and 4th (aOR 0.6, 95%CI 0.5-0.9) year of the study whereas history of runny nose (aOR 1.5, 95% CI 1.2-1.9) was positively associated.
Conclusions: Decrease in VT pneumococcal carriage in vaccinated and unvaccinated children indicates herd immunity. Sustained increase in vaccine coverage and close long-term surveillance is warranted.
Covid-19 Vaccine-Associated Thrombosis With Thrombocytopenia Syndrome (Tts): A Systematic Review And Post Hoc Analysis, Muhammad Usman Hafeez, Maha Ikram, Zunaira Shafiq, Azza Sarfraz, Zouina Sarfraz, Vikash Jaiswal, Muzna Sarfraz, Ivan Chérrez-Ojeda
Covid-19 Vaccine-Associated Thrombosis With Thrombocytopenia Syndrome (Tts): A Systematic Review And Post Hoc Analysis, Muhammad Usman Hafeez, Maha Ikram, Zunaira Shafiq, Azza Sarfraz, Zouina Sarfraz, Vikash Jaiswal, Muzna Sarfraz, Ivan Chérrez-Ojeda
Department of Paediatrics and Child Health
Background: A new clinical syndrome has been recognized following the COVID-19 vaccine, termed thrombosis with thrombocytopenia syndrome (TTS). The following systematic review focuses on extrapolating thrombotic risk factors, clinical manifestations, and outcomes of patients diagnosed with TTS following the COVID-19 vaccine.
Methods: We utilized the World Health Organization's criteria for a confirmed and probable case of TTS following COVID-19 vaccination and conducted a systematic review and posthoc analysis using the PRISMA 2020 statement. Data analysis was conducted using SPSS V25 for factors associated with mortality, including age, gender, anti-PF4/heparin antibodies, platelet nadir, D-dimer peak, time to event diagnosis, arterial or …
An Artificial Intelligence-Based, Personalized Smartphone App To Improve Childhood Immunization Coverage And Timelines Among Children In Pakistan: Protocol For A Randomized Controlled Trial, Abdul Momin Kazi, Saad Ahmed Qazi, Sadori Khawaja, Nazia Ahsan, Rao Moueed Ahmed, Muhammad Ayub Khan Mughal, Hussain Kalimuddin, Yasir Rauf, Mehreen Raza, Saima Jamal
An Artificial Intelligence-Based, Personalized Smartphone App To Improve Childhood Immunization Coverage And Timelines Among Children In Pakistan: Protocol For A Randomized Controlled Trial, Abdul Momin Kazi, Saad Ahmed Qazi, Sadori Khawaja, Nazia Ahsan, Rao Moueed Ahmed, Muhammad Ayub Khan Mughal, Hussain Kalimuddin, Yasir Rauf, Mehreen Raza, Saima Jamal
Department of Paediatrics and Child Health
Background: The immunization uptake rates in Pakistan are much lower than desired. Major reasons include lack of awareness, parental forgetfulness regarding schedules, and misinformation regarding vaccines. In light of the COVID-19 pandemic and distancing measures, routine childhood immunization (RCI) coverage has been adversely affected, as caregivers avoid tertiary care hospitals or primary health centers. Innovative and cost-effective measures must be taken to understand and deal with the issue of low immunization rates. However, only a few smartphone-based interventions have been carried out in low- and middle-income countries (LMICs) to improve RCI.
Objective: The primary objectives of this study are to …
Illness Severity And Outcomes Among Enteric Fever Cases From Bangladesh, Nepal, And Pakistan: Data From The Surveillance For Enteric Fever In Asia Project, 2016-2019, Ashley T. Longley, Caitlin Hemlock, Kashmira Date, Stephen P. Luby, Jason R. Andrews, Samir K. Saha, Isaac I. Bogoch, Mohammad Tahir Yousafzai, Denise O. Garrett, Farah Naz Qamar
Illness Severity And Outcomes Among Enteric Fever Cases From Bangladesh, Nepal, And Pakistan: Data From The Surveillance For Enteric Fever In Asia Project, 2016-2019, Ashley T. Longley, Caitlin Hemlock, Kashmira Date, Stephen P. Luby, Jason R. Andrews, Samir K. Saha, Isaac I. Bogoch, Mohammad Tahir Yousafzai, Denise O. Garrett, Farah Naz Qamar
Department of Paediatrics and Child Health
Background: Enteric fever can lead to prolonged hospital stays, clinical complications, and death. The Surveillance for Enteric Fever in Asia Project (SEAP), a prospective surveillance study, characterized the burden of enteric fever, including illness severity, in selected settings in Bangladesh, Nepal, and Pakistan. We assessed disease severity, including hospitalization, clinical complications, and death among SEAP participants.
Methods: We analyzed clinical and laboratory data from blood culture-confirmed enteric fever cases enrolled in SEAP hospitals and associated network laboratories from September 2016 to September 2019. We used hospitalization and duration of hospital stay as proxies for severity. We conducted a follow-up interview …
Typhoid And Paratyphoid Cost Of Illness In Pakistan: Patient And Health Facility Costs From The Surveillance For Enteric Fever In Asia Project Ii, Nelly Mejia, Farah Naz Qamar, Mohammad Tahir Yousafzai, Jamal Raza, Denise O. Garrett, Kashmira Date, Taiwo Abimbola, Sarah W. Pallas
Typhoid And Paratyphoid Cost Of Illness In Pakistan: Patient And Health Facility Costs From The Surveillance For Enteric Fever In Asia Project Ii, Nelly Mejia, Farah Naz Qamar, Mohammad Tahir Yousafzai, Jamal Raza, Denise O. Garrett, Kashmira Date, Taiwo Abimbola, Sarah W. Pallas
Department of Paediatrics and Child Health
Background: The objective of this study was to estimate the cost of illness from enteric fever (typhoid and paratyphoid) at selected sites in Pakistan.
Methods: We implemented a cost-of-illness study in 4 hospitals as part of the Surveillance for Enteric Fever in Asia Project (SEAP) II in Pakistan. From the patient and caregiver perspective, we collected direct medical, nonmedical, and indirect costs per case of enteric fever incurred since illness onset by phone after enrollment and 6 weeks later. From the health care provider perspective, we collected data on quantities and prices of resources used at 3 of the hospitals, …
Antimicrobial Resistance In Typhoidal Salmonella: Surveillance For Enteric Fever In Asia Project, 2016-2019, Farah Naz Qamar, Mohammad Tahir Yousafzai, Irum Fatima Dehraj, Sadia Shakoor, Seema Irfan, Aneeta Hotwani, Muhammad J. Hunzai, Rozina Thobani, Najeeb Rahman, Junaid Mehmood, Ashraf M. Memon
Antimicrobial Resistance In Typhoidal Salmonella: Surveillance For Enteric Fever In Asia Project, 2016-2019, Farah Naz Qamar, Mohammad Tahir Yousafzai, Irum Fatima Dehraj, Sadia Shakoor, Seema Irfan, Aneeta Hotwani, Muhammad J. Hunzai, Rozina Thobani, Najeeb Rahman, Junaid Mehmood, Ashraf M. Memon
Department of Paediatrics and Child Health
Background: Clinicians have limited therapeutic options for enteric as a result of increasing antimicrobial resistance, and therefore typhoid vaccination is recommended as a preventive measure. As a part of the Surveillance for Enteric Fever in Asia Project (SEAP), we investigated the extent measured the burden of antimicrobial resistance (AMR) among confirmed enteric fever cases in Bangladesh, Nepal, and Pakistan.
Methods: From September 2016-September 2019, SEAP recruited study participants of all age groups from its outpatient, inpatient, hospital laboratory, laboratory network, and surgical sites who had a diagnosis of febrile illness that was either suspected or blood culture confirmed for enteric …
Strategies To Improve Coverage Of Typhoid Conjugate Vaccine (Tcv) Immunization Campaign In Karachi, Pakistan, Farah Qamar Naz, Rabab Batool, Sonia Qureshi, Miqdad Ali, Tahira Sadaf, Junaid Mehmood, Khalid Iqbal, Akram Sultan, Noah Duff, Mohammad Tahir Yousafzai
Strategies To Improve Coverage Of Typhoid Conjugate Vaccine (Tcv) Immunization Campaign In Karachi, Pakistan, Farah Qamar Naz, Rabab Batool, Sonia Qureshi, Miqdad Ali, Tahira Sadaf, Junaid Mehmood, Khalid Iqbal, Akram Sultan, Noah Duff, Mohammad Tahir Yousafzai
Department of Paediatrics and Child Health
The emergence and spread of extensively drug-resistant (XDR) typhoid in Karachi, Pakistan led to an outbreak response in Lyari Town, Karachi utilizing a mass immunization campaign with typhoid conjugate vaccine (TCV), Typbar TCV®. The mass immunization campaign, targeted Lyari Town, Karachi, one of the worst affected towns during the XDR typhoid outbreak. Here we describe the strategies used to improve acceptance and coverage of Typbar TCV in Lyari Town, Karachi. The mass immunization campaign with Typbar TCV was started as a school- and hospital-based vaccination campaign targeting children between the age of 6 months to 15 years old. A dose …
Immunity And Field Efficacy Of Type 2-Containing Polio Vaccines After Cessation Of Trivalent Oral Polio Vaccine: A Population-Based Serological Study In Pakistan, Arie Voorman, Atif Habib, Imtiaz Hussain, Rana Muhammad Safdar, Jamal A. Ahmed, William C. Weldon, Imran Ahmed, Muhammad Umer, Jeffrey Partridge, Sajid Bashir Soofi
Immunity And Field Efficacy Of Type 2-Containing Polio Vaccines After Cessation Of Trivalent Oral Polio Vaccine: A Population-Based Serological Study In Pakistan, Arie Voorman, Atif Habib, Imtiaz Hussain, Rana Muhammad Safdar, Jamal A. Ahmed, William C. Weldon, Imran Ahmed, Muhammad Umer, Jeffrey Partridge, Sajid Bashir Soofi
Department of Paediatrics and Child Health
Background: In Pakistan and other countries using oral polio vaccine (OPV), immunity to type 2 poliovirus is now maintained by a single dose of inactivated polio vaccine (IPV) in routine immunization, supplemented in outbreak settings by monovalent OPV type 2 (mOPV2) and IPV. While well-studied in clinical trials, population protection against poliovirus type 2 achieved in routine and outbreak settings is generally unknown.
Methods: We conducted two phases of a population-based serological survey of 7940 children aged 6-11 months old, between November 2016 and October 2017 from 13 polio high-risk locations in Pakistan.
Results: Type 2 seroprevalence was 50% among …
Global Burden Of Respiratory Infections Associated With Seasonal Influenza In Children Under 5 Years In 2018: A Systematic Review And Modelling Study, Xin Wang, You Li, Katherine L. O'Brien, Qalab Abbas, Syed Asad Ali, Respiratory Virus Global Epidemiology Network, Mohammad Tahir Yousafzai, Zulfiqar Ahmed Bhutta, Sajid Bashir Soofi, Anita K. M. Zaidi
Global Burden Of Respiratory Infections Associated With Seasonal Influenza In Children Under 5 Years In 2018: A Systematic Review And Modelling Study, Xin Wang, You Li, Katherine L. O'Brien, Qalab Abbas, Syed Asad Ali, Respiratory Virus Global Epidemiology Network, Mohammad Tahir Yousafzai, Zulfiqar Ahmed Bhutta, Sajid Bashir Soofi, Anita K. M. Zaidi
Department of Paediatrics and Child Health
Background: Seasonal influenza virus is a common cause of acute lower respiratory infection (ALRI) in young children. In 2008, we estimated that 20 million influenza-virus-associated ALRI and 1 million influenza-virus-associated severe ALRI occurred in children under 5 years globally. Despite this substantial burden, only a few low-income and middle-income countries have adopted routine influenza vaccination policies for children and, where present, these have achieved only low or unknown levels of vaccine uptake. Moreover, the influenza burden might have changed due to the emergence and circulation of influenza A/H1N1pdm09. We aimed to incorporate new data to update estimates of the global …
Seroprevalence Of Anti-Polio Antibodies In Children From Polio High Risk Area Of Afghanistan: A Cross Sectional Survey 2017, Imtiaz Hussain, Ondrej Mach, Nasir A. Hamid, Zaid Bhatti, Deborah D. Moore, Shahid Khan, Hasan Khan, William C. Weldon, Zulfiqar Ahmed Bhutta, Sajid Bashir Soofi
Seroprevalence Of Anti-Polio Antibodies In Children From Polio High Risk Area Of Afghanistan: A Cross Sectional Survey 2017, Imtiaz Hussain, Ondrej Mach, Nasir A. Hamid, Zaid Bhatti, Deborah D. Moore, Shahid Khan, Hasan Khan, William C. Weldon, Zulfiqar Ahmed Bhutta, Sajid Bashir Soofi
Department of Paediatrics and Child Health
Background: Afghanistan is one of the remaining wild-poliovirus (WPV) endemic countries. We conducted a seroprevalence survey of anti-poliovirus antibodies in Kandahar Province.
Methods: Children in two age groups (6–11 months and 36–48 months) visiting Mirwais hospital in Kandahar for minor ailments unrelated to polio were enrolled. After obtaining informed consent, we collected venous blood and conducted neutralization assay to detect poliovirus neutralizing antibodies.
Results: A total of 420 children were enrolled and 409/420 (97%) were analysed. Seroprevalence to poliovirus type 1 (PV1) was 97% and 100% in the younger and older age groups respectively; it was 71% and 91% for …
Evaluation Of Vaccine Derived Poliovirus Type 2 Outbreak Response Options: A Randomized Controlled Trial, Karachi, Pakistan, Ali Faisal Saleem Dr, Mohammad Tahir Yousafzai, Ondrej Mach, Asia Khan, Farheen Quadri, William C. Weldon, M. Steven Oberste, Syed S. Zaidi, Muhammad M. Alam, Anita K. M. Zaidi
Evaluation Of Vaccine Derived Poliovirus Type 2 Outbreak Response Options: A Randomized Controlled Trial, Karachi, Pakistan, Ali Faisal Saleem Dr, Mohammad Tahir Yousafzai, Ondrej Mach, Asia Khan, Farheen Quadri, William C. Weldon, M. Steven Oberste, Syed S. Zaidi, Muhammad M. Alam, Anita K. M. Zaidi
Department of Paediatrics and Child Health
Background: Outbreaks of circulating vaccine derived polioviruses type 2 (cVDPV2) remain a risk to poliovirus eradication in an era without live poliovirus vaccine containing type 2 in routine immunization. We evaluated existing outbreak response strategies recommended by the World Health Organization (WHO) for control of cVDPV2 outbreaks.
Methods: Seronegative children for poliovirus type 2 (PV2) at 22 weeks of life were assigned to one of four study groups and received respectively (1) one dose of trivalent oral poliovirus vaccine (tOPV); (2) monovalent OPV 2 (mOPV2); (3) tOPV together with a dose of inactivated poliovirus vaccine (IPV); or (4) mOPV2 with …
A Comparison Of Three Diagnostic Platforms For The Detection Of Influenza A And B In Children, Furqan Kabir, Marvi Tariq, Fatima Aziz, Syed Imran Rizvi, Shahida Qureshi, Syed Asad Ali, Najeeha Talat Iqbal
A Comparison Of Three Diagnostic Platforms For The Detection Of Influenza A And B In Children, Furqan Kabir, Marvi Tariq, Fatima Aziz, Syed Imran Rizvi, Shahida Qureshi, Syed Asad Ali, Najeeha Talat Iqbal
Department of Paediatrics and Child Health
Background: Viral flu is the predominant cause of hospitalization in young children, which invariably leads to enhanced morbidity and mortality in children in developing countries. Initial treatment of viral flu is based on presumptive diagnosis. Bedside testing is not common in clinical settings because of variable sensitivity and specificity of rapid tests in different settings.
Methods: To address this issue, we evaluated the performance of Binax influenza A/B rapid testing kit against two robust molecular platforms (quantitative real-time polymerase chain reaction [qRT-PCR] and TaqMan array card [TAC]) in 24 nasopharyngeal (NP) swabs, collected from children under 5 years of age. …
Case-Control Vaccine Effectiveness Studies: Data Collection, Analysis And Reporting Results, Jennifer R. Verani, Abdullah H. Baqui, Claire V. Broome, Thomas Cherian, Cheryl Cohen, Jennifer L. Farrar, Daniel R. Feikin, Michelle J. Groome, Rana A. Hajjeh, Anita K. M. Zaidi
Case-Control Vaccine Effectiveness Studies: Data Collection, Analysis And Reporting Results, Jennifer R. Verani, Abdullah H. Baqui, Claire V. Broome, Thomas Cherian, Cheryl Cohen, Jennifer L. Farrar, Daniel R. Feikin, Michelle J. Groome, Rana A. Hajjeh, Anita K. M. Zaidi
Department of Paediatrics and Child Health
The case-control methodology is frequently used to evaluate vaccine effectiveness post-licensure. The results of such studies provide important insight into the level of protection afforded by vaccines in a 'real world' context, and are commonly used to guide vaccine policy decisions. However, the potential for bias and confounding are important limitations to this method, and the results of a poorly conducted or incorrectly interpreted case-control study can mislead policies. In 2012, a group of experts met to review recent experience with case-control studies evaluating vaccine effectiveness; we summarize the recommendations of that group regarding best practices for data collection, analysis, …
Case-Control Vaccine Effectiveness Studies: Preparation, Design, And Enrollment Of Cases And Control, Jennifer R. Verani, Abdullah H. Baqui, Claire V. Broome, Thomas Cherian, Cheryl Cohen, Jennifer L. Farrar, Daniel R. Feikin, Michelle J. Groome, Rana A. Hajjeh, Anita K. M. Zaidi
Case-Control Vaccine Effectiveness Studies: Preparation, Design, And Enrollment Of Cases And Control, Jennifer R. Verani, Abdullah H. Baqui, Claire V. Broome, Thomas Cherian, Cheryl Cohen, Jennifer L. Farrar, Daniel R. Feikin, Michelle J. Groome, Rana A. Hajjeh, Anita K. M. Zaidi
Department of Paediatrics and Child Health
Case-control studies are commonly used to evaluate effectiveness of licensed vaccines after deployment in public health programs. Such studies can provide policy-relevant data on vaccine performance under 'real world' conditions, contributing to the evidence base to support and sustain introduction of new vaccines. However, case-control studies do not measure the impact of vaccine introduction on disease at a population level, and are subject to bias and confounding, which may lead to inaccurate results that can misinform policy decisions. In 2012, a group of experts met to review recent experience with case-control studies evaluating the effectiveness of several vaccines; here we …
Vaccine Coverage And Adherence To Epi Schedules In Eight Resource Poor Settings In The Mal-Ed Cohort Study, Christel Hoest, Jessica C. Seidman, Gwenyth Lee, James A. Platts-Mills, Syed Asad Ali, Maribel Paredes Olortegui, Pascal Bessong, Ram Chandyo, Sudhir Babji, Venkata Raghava Mohan
Vaccine Coverage And Adherence To Epi Schedules In Eight Resource Poor Settings In The Mal-Ed Cohort Study, Christel Hoest, Jessica C. Seidman, Gwenyth Lee, James A. Platts-Mills, Syed Asad Ali, Maribel Paredes Olortegui, Pascal Bessong, Ram Chandyo, Sudhir Babji, Venkata Raghava Mohan
Department of Paediatrics and Child Health
Background: Launched in 1974, the Expanded Program on Immunization (EPI) is estimated to prevent two-three million deaths annually from polio, diphtheria, tuberculosis, pertussis, measles, and tetanus. Additional lives could be saved through better understanding what influences adherence to the EPI schedule in specific settings.
Methods: The Etiology, Risk Factors and Interactions of Enteric Infections and Malnutrition and the Consequences for Child Health and Development (MAL-ED) study followed cohorts in eight sites in South Asia, Africa, and South America and monitored vaccine receipt over the first two years of life for the children enrolled in the study. Vaccination histories were obtained …
Effect Of Mobile Phone Text Messages Reminders On Uptake Of Routine Immunization Among Children In Pakistan- Study Protocol For A Randomized Clinical Trial, Abdul Momin Kazi, Murtaza Ali, Khurram Zubair, Hussain Kalimuddin, Syed Asad Ali
Effect Of Mobile Phone Text Messages Reminders On Uptake Of Routine Immunization Among Children In Pakistan- Study Protocol For A Randomized Clinical Trial, Abdul Momin Kazi, Murtaza Ali, Khurram Zubair, Hussain Kalimuddin, Syed Asad Ali
Department of Paediatrics and Child Health
Introduction: Routine Immunization (RI) is considered one of the best public health interventions to decrease child morbidity and mortality. The RI coverage in Pakistan is still well below the desired level, leading to continued polio transmission, large measles outbreaks and thousands of deaths from vaccine-preventable illnesses. Different innovative and cost effective strategies are required to look into for enhancement in vaccination uptake and coverage. We plan to test the effectiveness of reminders to parents/caregivers on cell phones through short messaging system (SMS) in improving vaccine uptake and on-time routine immunization for children in Pakistan.
Methods and Analysis: A parallel-randomized controlled …
Real-World Comparison Of Two Molecular Methods For Detection Of Respiratory Viruses, Syed Asad Ali, James E. Gern, Tina V. Hartert, Kathryn M. Edwards, Marie R. Griffin, E Kathryn Mille, Tebeb Gebretsadik, Tressa Pappas, Wai Ming Lee, John V. Williams
Real-World Comparison Of Two Molecular Methods For Detection Of Respiratory Viruses, Syed Asad Ali, James E. Gern, Tina V. Hartert, Kathryn M. Edwards, Marie R. Griffin, E Kathryn Mille, Tebeb Gebretsadik, Tressa Pappas, Wai Ming Lee, John V. Williams
Department of Paediatrics and Child Health
Background: Molecular polymerase chain reaction (PCR) based assays are increasingly used to diagnose viral respiratory infections and conduct epidemiology studies. Molecular assays have generally been evaluated by comparing them to conventional direct fluorescent antibody (DFA) or viral culture techniques, with few published direct comparisons between molecular methods or between institutions. We sought to perform a real-world comparison of two molecular respiratory viral diagnostic methods between two experienced respiratory virus research laboratories.
Methods: We tested nasal and throat swab specimens obtained from 225 infants with respiratory illness for 11 common respiratory viruses using both a multiplex assay (Respiratory MultiCode-PLx Assay [RMA]) …