Background. Influenza vaccination of healthcare personnel (HCP) is recommended in> 40
countries. However, there is controversy surrounding the evidence that HCP vaccination …

Diabetes mellitus imposes a significant and increasing burden on society, with major
consequences for human health, welfare and the economy worldwide. Persons with …

Background There is a paucity of data on vaccine-induced or infection-induced (hybrid or
natural) immunity against omicron (B. 1.1. 529) subvariant BA. 2, particularly in comparing …

Importance The Omicron variant is phylogenetically and antigenically distinct from earlier
SARS-CoV-2 variants and the original vaccine strain. Protection conferred by prior SARS …

Background Influenza vaccine effectiveness (VE) is generally interpreted in the context of
vaccine match/mismatch to circulating strains with evolutionary drift in the latter invoked to …

Influenza viruses undergo frequent antigenic changes. As a result, the viruses circulating
change within and between seasons, and the composition of the influenza vaccine is …

Objective The test-negative design has emerged in recent years as the preferred method for
estimating influenza vaccine effectiveness (VE) in observational studies. However, the …

Background. Each year, the US Influenza Vaccine Effectiveness Network examines the
effectiveness of influenza vaccines in preventing medically attended acute respiratory …

The effect of prior influenza vaccination history on vaccine effectiveness was assessed in a
community cohort over 8 seasons. Current-and previous-season vaccination generated …

Background The serotype-specific effectiveness of 23-valent pneumococcal polysaccharide
vaccine (PPV23) against pneumococcal pneumonia has not been established in people …