Importance The incidence of SARS-CoV-2 infection, including among individuals who have
received 2 doses of COVID-19 vaccine, increased substantially following the emergence of …

Background COVID-19 vaccines provide protection against symptomatic infection that might
require medical attention and against severe outcomes; however, there is a paucity of …

Objective To estimate waning of covid-19 vaccine effectiveness over six months after second
dose. Design Cohort study, approved by NHS England. Setting Linked primary care …

Since the emergence of the SARS-CoV-2 Omicron variant, multiple observational studies
have reported negative vaccine effectiveness (VE) against infection, symptomatic infection …

Objectives Evidence on waning patterns in protection from vaccine-induced, infection-
induced, and hybrid immunity against death is scarce. The aim of this study is to assess the …

In March 2021 the World Health Organization (WHO) made interim guidance available on
best practices for undertaking vaccine effectiveness (VE) evaluations in Evaluation of COVID …

Background The COVID-19 pandemic posed significant challenges to global health
systems. Efficient public health responses required a rapid and secure collection of health …

Background Evidence on protection of different patterns of infection-and vaccine-acquired
immunity against Omicron-associated severe illness is useful in planning booster …

The authors correctly note that there was a difference in the number of vaccinated and
unvaccinated children who remained infectious after day 5. Specifically, there were no …

By Aug 10, 2022, 3 497 208 of the estimated 4· 4 million adults living in Scotland had
received three doses of a COVID19 vaccine. However, a proportion of the adult population …