Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a highly transmissible
and virulent human-infecting coronavirus that emerged in late December 2019 in Wuhan …

We estimated the seroprevalence of anti‐severe acute respiratory syndrome coronavirus 2
(SARS‐CoV‐2) antibodies in residents of African countries and explored its associated …

Objective To estimate the effectiveness of the inactivated whole virus vaccine, CoronaVac
(Sinovac Biotech), against symptomatic covid-19 in the elderly population of São Paulo …

Brazil has been severely hit by COVID-19, with rapid spatial spread of both cases and
deaths. We used daily data on reported cases and deaths to understand, measure, and …

Background The interaction between COVID-19, non-communicable diseases, and chronic
infectious diseases such as HIV and tuberculosis is unclear, particularly in low-income and …

Brazil has been heavily affected by coronavirus disease 2019 (COVID-19). In this study, we
used data on reported total deaths in 2020 and in January–April 2021 to measure and …

Background Although COVID-19 has greatly affected many low-income and middle-income
countries, detailed information about patients admitted to the intensive care unit (ICU) is still …

Summary Background Background The second wave of the COVID-19 pandemic was more
aggressive in Brazil compared to other countries around the globe. Considering the …

Background Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant,
Gamma, emerged in the city of Manaus in late 2020 during a large resurgence of …

Background SARS-CoV-2 predisposes patients to secondary infections; however, a better
understanding of the impact of coinfections on the outcome of hospitalized COVID-19 …