Influenza Virus Vaccines Commons^™

Evaluating Covid-19, Influenza, And Rsv Vaccine Effectiveness, Iromi N. Jayawardena

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Respiratory infectious diseases, including COVID-19, influenza, and RSV, pose significant public health challenges, especially during the respiratory virus season. Vaccination remains the primary intervention to mitigate morbidity and mortality associated with these diseases. Vaccine effectiveness (VE) can vary between seasons and populations, necessitating continuous evaluation. This study aims to evaluate the effectiveness of the 2024-2025 COVID-19 mRNA vaccine, 2024-2025 seasonal influenza vaccine, and single-dose RSV vaccine over two seasons.

Utilizing electronic health records (EHRs) from the Prisma Health healthcare system, this dissertation emulated target trials to assess the vaccine effectiveness of each vaccine. Risk set propensity matching was used to …

Impact Of Haemophilus Influenzae Type B Conjugate Vaccine On Bacterial Meningitis In The Dominican Republic, Ellen H. Lee, Miriam Corcino, Arelis Moore De Peralta, Zacarias Garib, Chabela Peña, Jacquelin Sánchez, Josefina Fernández, Jesús M. Feris-Iglesias, Brendan Flannery

Publications

OBJECTIVES:

Widespread use of Haemophilus influenzae type b (Hib) vaccines has dramatically reduced the burden of Hib disease throughout the Americas. Few studies have evaluated the impact of Hib vaccination on non-culture-confirmed disease. This study analyzed trends in probable bacterial meningitis before and after the introduction of Hib vaccine in the Dominican Republic and estimated vaccine effectiveness against Hib meningitis.

METHODS:

Meningitis cases among children < 5 years of age were identified from admission records of the main pediatric hospital in Santo Domingo during 1998-2004. Laboratory criteria were used to classify meningitis cases with probable bacterial etiology; confirmed cases had positive bacterial culture or antigen detection in cerebrospinal fluid. Cumulative incidence rates of confirmed and probable bacterial meningitis were calculated for children living in the National District. Confirmed cases of Hib meningitis were enrolled in a case-control study with age- and neighborhood-matched control children to calculate vaccine effectiveness.

RESULTS:

Before vaccine introduction, annual rates of meningitis with probable bacterial etiology were 49 cases per 100 000 children < 5 years old; Hib accounted for 60% of confirmed bacterial cases. During 2002-2004, after vaccine introduction, annual rates of probable bacterial meningitis were 65% lower at 16 cases per 100 000, and Hib accounted for 26% of confirmed cases. Rates of Hib meningitis and probable bacterial meningitis with no determined etiology declined by 13 and 17 cases per 100 000, respectively.

CONCLUSIONS:

Introduction of Hib vaccine substantially reduced the incidence of confirmed and probable bacterial meningitis in …