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Articles 8881 - 8910 of 12203
Full-Text Articles in Entire DC Network
Being Ready To Treat Ebola Virus Disease Patients, David Brett-Major, Shevin T. Jacob, Frederique A. Jacquerioz, George F. Risi, William A. Fischer, Yasuyuki Kato, Catherine F. Houlihan, Ian Crozier, Henry Kyobe Bosa, James V. Lawler, Takuya Adachi, Sara K. Hurley, Louise E. Berry, John C. Carlson, Thomas C. Button, Susan L. Mclellan, Barbara J. Shea, Gary G. Kuniyoshi, Mauricio Ferri, Srinivas G. Murthy, Nicola Petrosillo, Francois Lamontagne, David T. Porembka, John S. Schieffelin, Lewis Rubinson, Tim O'Dempsey, Suzanne M. Donovan, Daniel G. Bausch, Robert A. Fowler, Thomas E. Fletcher
Being Ready To Treat Ebola Virus Disease Patients, David Brett-Major, Shevin T. Jacob, Frederique A. Jacquerioz, George F. Risi, William A. Fischer, Yasuyuki Kato, Catherine F. Houlihan, Ian Crozier, Henry Kyobe Bosa, James V. Lawler, Takuya Adachi, Sara K. Hurley, Louise E. Berry, John C. Carlson, Thomas C. Button, Susan L. Mclellan, Barbara J. Shea, Gary G. Kuniyoshi, Mauricio Ferri, Srinivas G. Murthy, Nicola Petrosillo, Francois Lamontagne, David T. Porembka, John S. Schieffelin, Lewis Rubinson, Tim O'Dempsey, Suzanne M. Donovan, Daniel G. Bausch, Robert A. Fowler, Thomas E. Fletcher
Journal Articles: Epidemiology
As the outbreak of Ebola virus disease (EVD) in West Africa continues, clinical preparedness is needed in countries at risk for EVD (e.g., United States) and more fully equipped and supported clinical teams in those countries with epidemic spread of EVD in Africa. Clinical staff must approach the patient with a very deliberate focus on providing effective care while assuring personal safety. To do this, both individual health care providers and health systems must improve EVD care. Although formal guidance toward these goals exists from the World Health Organization, Medecin Sans Frontières, the Centers for Disease Control and Prevention, and …
Prevalence Of Schistosoma Haematobium Infection Among School-Age Children In Afar Area, Northeastern Ethiopia, Abraham Degarege, Zeleke Mekonnen, Bruno Levecke, Mengistu Legesse, Yohannes Negash, Jozef Vercruysse, Berhanu Erko
Prevalence Of Schistosoma Haematobium Infection Among School-Age Children In Afar Area, Northeastern Ethiopia, Abraham Degarege, Zeleke Mekonnen, Bruno Levecke, Mengistu Legesse, Yohannes Negash, Jozef Vercruysse, Berhanu Erko
Journal Articles: Epidemiology
In this study, the prevalence and intensity of Schistosoma haematobium infection was determined among school-age children living in the Middle and Lower Awash Valley, Afar Regional State of Ethiopia. Between February and May 2014, urine samples were collected from 885 school-age children (5-16 years of age) from the Middle (n = 632; 4 villages) and Lower (n = 253; 3 villages) Awash Valley. All samples were processed using urine filtration to detect and quantify S. haematobium eggs. In addition, a subset of the urine samples was tested for hematuria using a urine dipstick (n = 556). The overall prevalence was …
Soil-Transmitted Helminth Infections And Associated Risk Factors Among Schoolchildren In Durbete Town, Northwestern Ethiopia, Tilahun Alelign, Abraham Degarege, Berhanu Erko
Soil-Transmitted Helminth Infections And Associated Risk Factors Among Schoolchildren In Durbete Town, Northwestern Ethiopia, Tilahun Alelign, Abraham Degarege, Berhanu Erko
Journal Articles: Epidemiology
Identifying determinants of soil transmitted helminth infection is vital to design control strategy for the disease. This study assessed the prevalence of STH infections and associated factors among schoolchildren in Durbete town, northwestern Ethiopia. Data about the sociodemographic and socioeconomic status of the children were collected using a questionnaire and stool samples were diagnosed using thick Kato-Katz smear. STH infection was more common among school-age children in Durbete town. Hookworm was the most frequent helminth species detected. The prevalence of STH infection was more in children who did not practice wearing shoes and washing hands before eating and in those …
Overview Of Australian Indigenous Health Status, 2014, Jane Burns, Samantha Burrow, Neil Drew, Michelle Elwell, Caitlin Gray, Millie Harford-Mills, Joanne Hoareau, Renee Lynch, Andrea Macrae, Trish O'Hara, Christine Potter, Kathy Ride, Avinna Trzesinski
Overview Of Australian Indigenous Health Status, 2014, Jane Burns, Samantha Burrow, Neil Drew, Michelle Elwell, Caitlin Gray, Millie Harford-Mills, Joanne Hoareau, Renee Lynch, Andrea Macrae, Trish O'Hara, Christine Potter, Kathy Ride, Avinna Trzesinski
Research outputs 2014 to 2021
The main purpose of the Overview is to provide a comprehensive summary of the most recent indicators of the health and current health status of Australia’s Aboriginal and Torres Strait Islander peoples. It has been prepared by the Australian Indigenous HealthInfoNet as a part of our contribution to ‘closing the gap’ in health between Aboriginal and Torres Strait Islander people and other Australians by making relevant, high quality knowledge and information easily accessible to policy makers, health service providers, other health professionals including Health workers, program managers, clinicians, researchers, students and the general community.
The initial sections of this Overview …
Community Readiness Assessment: Applications For Community Nutrition Research, Whitney E. Houser
Community Readiness Assessment: Applications For Community Nutrition Research, Whitney E. Houser
All Master's Theses
Trends in qualitative community nutrition research demonstrate a powerful, emerging perspective in the midst of a field historically dominated by quantitative methods of inquiry. For this qualitative study, ten key respondents were purposively selected and interviewed using the Community Readiness Model (CRM) to capture community knowledge of food insecurity issues and strategies. Data were analyzed using anchored rating scales, revealing readiness at a stage three, characterized by a vague awareness of local food insecurity. The purpose of this study is to report on the strengths and challenges of the CRM experienced when utilizing the model to address food insecurity. The …
The Role Of Kentucky State-Supported Postsecondary Education In Creating A Healthier Citizenship, Julia K. Buchanan
The Role Of Kentucky State-Supported Postsecondary Education In Creating A Healthier Citizenship, Julia K. Buchanan
Theses and Dissertations--Educational Leadership Studies
Citizens within the United States of America (USA) and the Commonwealth of Kentucky exhibit indicators of lessened health status in a variety of areas. Many chronic diseases and conditions are due to individual lifestyle behaviors, which can be modified through the implementation of dedicated health and wellness programming. Such programs, often housed within institutions of higher education, have the ability to impact many individuals including students, faculty, staff, and community members. This dissertation is a report of a mixed-methods study that begins to explore how state-supported postsecondary institutions may be able to impact individual behavior and thus, resulting health outcomes. …
Gender Considerations Along The Hiv Treatment Cascade: An Evidence Review With Priority Actions, Melanie Croce-Galis, Jill Gay, Karen Hardee, What Works Association, Population Council
Gender Considerations Along The Hiv Treatment Cascade: An Evidence Review With Priority Actions, Melanie Croce-Galis, Jill Gay, Karen Hardee, What Works Association, Population Council
Reproductive Health
This treatment brief provides policymakers and program implementers with evidence about the impact of gender dynamics on treatment access and adherence and the gender-related gaps in treatment research and programming. It also includes priority actions that can be taken to better address gender within treatment programming and raises questions for implementation science in order to achieve the global 90-90-90 goal. This brief draws from What Works for Women and Girls: Evidence for HIV Interventions and uses the WHO treatment cascade framework to identify and analyze major gender considerations in providing antiretroviral therapy to those living with HIV in low- and …
Diabetes Among Hispanic Immigrants: The Impact Of Age At Migration, Nancy Hahn
Diabetes Among Hispanic Immigrants: The Impact Of Age At Migration, Nancy Hahn
Walden Dissertations and Doctoral Studies
Diabetes is a disease that affects the Hispanic population in disproportionate numbers. With larger numbers of immigrants coming to the United States who are of Hispanic origin, the individual risk and health burden of this disease will have a major impact on the quality of life and the health care system. Research into the influence of the timing of changes in lifestyle suggested an association between specific levels of socioecological exposures and certain health conditions. This study examined that possibility. The use of the National Health Interview Survey, 2005-2011, provided adequate data for examining whether age at migration was associated …
Health Literacy And The Level Of Hypertension In Urban Latinos, Marlene Rosetta Glashen
Health Literacy And The Level Of Hypertension In Urban Latinos, Marlene Rosetta Glashen
Walden Dissertations and Doctoral Studies
Health literacy (HL) plays a significant role in health care communication and patient compliance. Low health literacy leads to noncompliance with health instructions, poor health choices, failure to participate in recommended health screenings, frequent hospitalizations, and higher health care costs. Using the health belief model (HBM) as the conceptual framework, this quantitative, cross-sectional study addresses a gap in the literature related to the research questions of this study. The research questions are: (a) Is there a relationship between HL and the level of hypertension (HTN) in hypertensive urban Latinos?, and (b) Will HL predict the level of control of HTN …
Inflammatory Markers Associated With Disease Progression Of Cardiorenal Syndrome, Srikanta Banerjee
Inflammatory Markers Associated With Disease Progression Of Cardiorenal Syndrome, Srikanta Banerjee
Walden Dissertations and Doctoral Studies
An increase in cellular inflammatory biomarkers directly increases the risk of cardiovascular disease (CVD). Using the social ecological and biomedical theories, the study examined quantitatively how specific inflammatory biomarkers are associated with cardiorenal syndrome (CRS), a potential complication of hypertension and diabetes, and how sociodemographic factors modify this association in the U.S. adult population. A retrospective secondary data analysis of the data collected from National Health and Nutrition Examination Survey (NHANES) 1999-2010 was utilized to evaluate these hypotheses. High sensitivity C-reactive protein, homocysteine (hcy), and fibrinogen had a modifying effect on Type 4 (chronic reno-cardiac etiology), Type 2 CRS (chronic …
A Phenomenological Inquiry Into The Low Rates Of Influenza Vaccination Among Older African Americans, Delia Roxanne Howson-Santana
A Phenomenological Inquiry Into The Low Rates Of Influenza Vaccination Among Older African Americans, Delia Roxanne Howson-Santana
Walden Dissertations and Doctoral Studies
Influenza vaccination is recommended for persons with high-risk health conditions such as chronic diseases to prevent flu-related complications and death. African Americans 65 years and older have consistently been reported to have the lowest influenza vaccination rates compared to all other racial groups, despite having higher rates of chronic diseases. A review of the literature indicated that there is a dearth of qualitative studies examining the grounds for these low rates. In this study, 15 African Americans 65 years and older were interviewed to explore the factors that contribute to low rates of flu vaccination among this racial group. Research …
Alternative Therapy For Sickle Cell Disease, Huda Alsultan
Alternative Therapy For Sickle Cell Disease, Huda Alsultan
Graduate Research Papers
Sickle cell disease can lead to serious complications, such as stroke, acute chest syndrome, pulmonary hypertension, organ damage, blindness, skin ulcers, gallstones and priapism. Additionally, patients with sickle cell disease usually have several pain crises during the year, which means they have to be admitted to the hospital a couple days or weeks in order to treat these crises by pain relievers through IV line or veins. This necessitates quite often that the patient would be absent from their jobs or schools. Frequent absences may cause people with sickle cell disease to experience stress which in turn leads to a …
Health-Related Coping Strategies Among Korean Immigrant Women Living In The U.S., Su-Joung Shim
Health-Related Coping Strategies Among Korean Immigrant Women Living In The U.S., Su-Joung Shim
Open Access Theses
Immigrants are known to experience enormous culture transitions that can affect their health. Depressive symptoms are characteristic of immigrants in general, and women immigrants in particular often suffer from mental health problems along with health-related issues. The qualitative study presented here relates the health-related experiences of Korean women immigrants living in a hosting country, the U.S. in this study, with the purpose of exploring their health-related issues and coping strategies.^ Qualitative research methods based on grounded theory were employed to explore the health-related coping strategies of Korean immigrant women in the U.S. A nonprobability, purposive, and snowball sampling method was …
Preliminary Nutritional Profile Analysis Of Box Tops 4 Education Food Products, Hannah Griffith
Preliminary Nutritional Profile Analysis Of Box Tops 4 Education Food Products, Hannah Griffith
Williams Honors College, Honors Research Projects
The marketing of unhealthy food to children is often cited as a cause of the obesity epidemic.1 However, most studies that examine this issue evaluated the marketing of food through print or television advertising. This project investigates the marketing of food products to children through incentive based programs, specifically General Mill’s Box Tops 4 Education. This study undertakes a preliminary systematic analysis of Box Tops food items to determine their healthfulness. A subset of all Box Tops food products was selected for review and a basic quantitative content analysis of priority nutrients was performed. Priority nutrients were identified …
Freshman 15: How The University Of Akron Is Affected Per Residence Hall, Daniel G. Mcquillen
Freshman 15: How The University Of Akron Is Affected Per Residence Hall, Daniel G. Mcquillen
Williams Honors College, Honors Research Projects
Students entering their freshmen year of college face a variety of lifestyle changes. These changes often include increased caloric consumption, increased levels of stress, decreased physical activity, and increased alcohol consumption. Because of these lifestyle changes, it is commonly asserted that freshman gain weight throughout their first year in college. A common expression used to describe this weight gain is the “Freshman 15,” which asserts that the average student gains 15 pounds during their freshman year. PURPOSE: The purpose of this study was to gather data regarding the on-campus freshmen’s diet and exercise habits. The data gathered was used to …
Wellness Wednesday: Monitoring Lifestyle Changes Via The Transtheoretical Model, Mariah J. Bloom Ms.
Wellness Wednesday: Monitoring Lifestyle Changes Via The Transtheoretical Model, Mariah J. Bloom Ms.
Williams Honors College, Honors Research Projects
Physical activity has been shown to improve cognition, functional and overall health indicators across the lifespan. Older adults are less likely to participate in physical due to barriers and risk related factors. Additionally, lower income, underserved populations experience added barriers as well. Interventions addressing negative health behaviors in these populations have rarely been implemented. PURPOSE: Using the Transtheoretical Model (TTM) behavior change theory, the purpose of this study was to determine if five, monthly educational and exercise classes targeting these populations will improve motivation levels and result in facilitating increases in physical activity levels. METHODS: One validated TTM survey was …
Women's Fitness Week, Claire T. Lucas, Tiffany M. Finch
Women's Fitness Week, Claire T. Lucas, Tiffany M. Finch
Williams Honors College, Honors Research Projects
This project addressed women’s wellness. Many women experience physical and mental health issues related to a lack of physical activity or psychological support. Women’s Fitness Week was offered to women of the University of Akron and the outside community, providing opportunities to learn more about and improve upon the various dimensions of wellness – emotional, environmental, financial, intellectual, occupational, physical, social/cultural, and spiritual. Events were held at the University’s Student Recreation and Wellness Center and encompassed topics such as nutrition, weight training, and self-defense. The goals of this project were to: increase knowledge levels of fitness, health, and wellness, increase …
The Effects Of Vitamin D Supplementation On Influenza, Jonah M. Spoerndle
The Effects Of Vitamin D Supplementation On Influenza, Jonah M. Spoerndle
Williams Honors College, Honors Research Projects
Recently the role of vitamin D in other non-classical capacities has been evaluated. One of these non-classical vitamin D roles is assisting in maintaining proper immune system health. One disease that has a great effect on the immune system is influenza. Vitamin D helps to prevent and limit influenza by moderating the inflammatory cytokines as well as promoting the production of monocytes that help destroy the invading materials. Through the use of vitamin D supplementation the recommended daily amount of vitamin D can be assured and optimal health could be achieved. The purpose of this project was to design a …
Association Of Kidney Stones With Chronic Disease Among Adults In The United States: Considerations By Race-Ethnicity, Lashaunta Marie Glover
Association Of Kidney Stones With Chronic Disease Among Adults In The United States: Considerations By Race-Ethnicity, Lashaunta Marie Glover
Electronic Theses and Dissertations
Background: little research has been conducted to describe the relationship between kidney stones and risk of cardiovascular disease and stroke in individuals of different race ethnicities. Purpose: the purpose of this study was to compare the prevalence of co-morbidities and to investigate whether there was a statistically significant association between kidney stone formers and increased odds of cardiovascular disease and stroke in race-ethnicity groups. Methods: data from the 2007-2012 cycles of the national health and nutrition examination survey (Nhanes) were used. Survey and biological data used included kidney stone cases, hypertension, obesity, diabetes, chronic kidney disease, cardiovascular disease and stroke. …
Social Contexts Of Infant Feeding And Infant Feeding Decisions, Ellen J. Schafer, Natalie A. Williams, Siri Digney, Marion E. Hare, Sato Ashida
Social Contexts Of Infant Feeding And Infant Feeding Decisions, Ellen J. Schafer, Natalie A. Williams, Siri Digney, Marion E. Hare, Sato Ashida
Department of Child, Youth, and Family Studies: Faculty Publications
Background: Infant feeding takes place within a network of social relationships. However, the social context in which infant feeding advice is received remains underresearched.
Objective: The objective of this study was to evaluate the social contexts of infant feeding by examining individual and relationship characteristics of mothers and network members associated with advice to exclusively breastfeed, exclusively formula feed, or use a combination of breast milk and formula.
Methods: Information about 287 network members was reported by 80 low-income mothers during a one-time survey. Characteristics of relationships associated with mothers receiving advice (exclusively breastfeed/formula feed, combination feed) from each network …
Thinking About Ebola, David Brett-Major
Thinking About Ebola, David Brett-Major
Journal Articles: Epidemiology
No abstract provided.
Complementary Alternative Medicine: Awareness And Perceptions Of Health Care Providers Who Provide Systemic Lupus Care, Carmen Ionie Bartley
Complementary Alternative Medicine: Awareness And Perceptions Of Health Care Providers Who Provide Systemic Lupus Care, Carmen Ionie Bartley
Walden Dissertations and Doctoral Studies
The purpose of this study was to explore healthcare providers' awareness and perceptions of complementary and alternative medicine (CAM) use in providing systemic lupus erythematosus (SLE) care. This phenomenolgical study was built upon existing research indicating SLE patients' need to foster better communication about CAM use. Participants were recruited from the Long Island Rheumalogical Clinic in the State of New York. Individual in-depth semistructered interviews were conducted to explore the awareness and perceptions of a purposive sample of 10 healthcare providers who care for patients with SLE. Transcripts were analyzed, and categorical themes were developed. Guided by the use of …
Health-Related Beliefs Among Low-Income African American Women And Their Perceptions About Obesity, Cenora Kimberly Akhidenor
Health-Related Beliefs Among Low-Income African American Women And Their Perceptions About Obesity, Cenora Kimberly Akhidenor
Walden Dissertations and Doctoral Studies
The aim of this study was to explore the health-related beliefs and perceptions of low-income African American women regarding obesity. Phenomenology served as the conceptual framework for this study. African American women, especially those in low-income brackets, have been shown to weigh more than women of other racial/ethnic groups. The consequences of these high rates are increased risks of developing chronic health disorders, such as type II diabetes and cardiovascular disease. The study sample consisted of 7 low-income obese African American women, ranging in age from 20 to 62, who resided in the Pacific Northwest. Recruitment for participation occurred via …
Post Hysterectomy Discharge Destination And Risk Of Hospital Readmission In Elderly Women, Ruth Ann Churley-Strom
Post Hysterectomy Discharge Destination And Risk Of Hospital Readmission In Elderly Women, Ruth Ann Churley-Strom
Walden Dissertations and Doctoral Studies
In elderly women, discharge after gynecologic surgery is often associated with increased morbidity. Little information exists about elderly women's discharge destination after gynecologic surgery and the outcome of early hospital readmission. The purpose of this study, conceptualized using the quality health outcomes model, was to examine whether post hysterectomy discharge destination is an independent predictor of 30-day hospital readmission in women age 65 and older. Examination of covariates included patient age, race, medical comorbidity and complications of care, as well as surgical anatomic approach and operative technique. This study involved use of a retrospective cohort design and data from 10,598 …
Temporality Of Risk Factors And The Gender Differential Related To Autism Spectrum Disorder Diagnosis, Donna L. Sullivan
Temporality Of Risk Factors And The Gender Differential Related To Autism Spectrum Disorder Diagnosis, Donna L. Sullivan
Walden Dissertations and Doctoral Studies
Autism spectrum disorders (ASD) constitute life-long neurodevelopmental conditions. Globally, ASD risk for males remains 2 to 4 times greater than for females. Critical exposure mechanisms, their timing on ASD risk, and associations with the ASD gender differential remain elusive. The purpose of this study was to describe the relationship between preconception, pregnancy, recalled lactation practice, and infant traits, on ASD risk and the gender differential of ASD. A recently published temporal framework was adapted to study effects of maternal smoking and vitamin use, and recalled lactation practice on offspring ASD diagnosis with adjustment for preconception health and infant breathing traits. …
A Cross-Sectional Study: Dietary Micronutrient Levels In Allied Health And Nursing Students, Grisseel A. Cruz-Espaillat
A Cross-Sectional Study: Dietary Micronutrient Levels In Allied Health And Nursing Students, Grisseel A. Cruz-Espaillat
Walden Dissertations and Doctoral Studies
The adequate intake of micronutrients is important to maintain optimal health and prevent nutritional disorders and chronic disease. Studies have shown that medical students often reduce self-care behaviors and lack adequate dietary intake, leading to nutritional deficiencies. In this quantitative cross-sectional study, measurements of micronutrient levels in a sample of allied health and nursing students were compared to Recommended Daily Allowance (RDA) values. NutritionQuest Data-on-Demand System was used to analyze nutrients and food group intake. The postpositivist paradigm was used to examine how the independent and dependent variables relate to each other. Using a one-sample t test, a comparison of …
The Association Of Lead With Cataracts And Vision-Related Problems In Perimenopausal Women, Imogene Drakes
The Association Of Lead With Cataracts And Vision-Related Problems In Perimenopausal Women, Imogene Drakes
Walden Dissertations and Doctoral Studies
Around the world, women are subject to an earlier incidence of cataracts, have a higher risk for cataracts, and also have a higher risk for other vision-related problems than men. Previous research has indicated an association between endogenous lead stored in long bones and cataracts in men over 60 years of age; however, a similar study in women did not reveal an association. This case control study was conducted to investigate whether perimenopausal mobilization of endogenous lead serves as a possible causative factor for women's generalized vision issues and cataract incidence in particular. Secondary data were gathered from 1,416 women …
Emergency Medical Service Worker Knowledge Of And Compliance With Occupational Exposures To Infectious Diseases, Debra Ann Wrentz-Hudson
Emergency Medical Service Worker Knowledge Of And Compliance With Occupational Exposures To Infectious Diseases, Debra Ann Wrentz-Hudson
Walden Dissertations and Doctoral Studies
Firefighter Emergency Medical Service (EMS) responder personnel are at a high risk for occupational exposures to bloodborne and airborne infectious pathogens due to their unpredictable work duties in the pre-hospital environment. Not much is known about the compliance with Universal Precautions (UP) among firefighter EMS responders' personnel with regards to occupational exposures to infectious diseases. The purpose of this cross-sectional research study was to determine the relationship between compliance with UP, knowledge of UP, attitudes towards UP, occupational practices, and occupational exposures to bloodborne and airborne pathogens to prevent transmission of infectious disease among firefighter EMS responder personnel in the …
Patient And Provider Characteristics And Practice Patterns Of Primary Care Physicians Of Weight-Related Counseling, Kolby T. Redd
Patient And Provider Characteristics And Practice Patterns Of Primary Care Physicians Of Weight-Related Counseling, Kolby T. Redd
Theses and Dissertations
Background: The United States Preventive Services Task Force (USPSTF) recommends three types of health education counseling for use in primary care practices for adult, obese patients. While these recommendations are well known, a low percentage of physicians provide this counseling to their patients on a consistent basis. There are inconsistencies in past studies in regards to what aspects of the health encounter influence the likelihood of receiving health education counseling during a primary care visit. The objective of this study was to (1) investigate the patterns of these three types of counseling occurring within primary care practices and to …
Evolution In Action: Climate Change, Biodiversity Dynamics And Emerging Infectious Disease, Eric P. Hoberg, Daniel R. Brooks
Evolution In Action: Climate Change, Biodiversity Dynamics And Emerging Infectious Disease, Eric P. Hoberg, Daniel R. Brooks
Harold W. Manter Laboratory of Parasitology: Faculty Publications
Climatological variation and ecological perturbation have been pervasive drivers of faunal assembly, structure and diversification for parasites and pathogens through recurrent events of geographical and host colonization at varying spatial and temporal scales of Earth history. Episodic shifts in climate and environmental settings, in conjunction with ecological mechanisms and host switching, are often critical determinants of parasite diversification, a view counter to more than a century of coevolutionary thinking about the nature of complex host–parasite assemblages. Parasites are resource specialists with restricted host ranges, yet shifts onto relatively unrelated hosts are common during phylogenetic diversification of parasite lineages and directly …