PRO/AH/EDR> COVID-19 update (554): Nigeria mutation, UK duration of immunity, WHO, global

COVID-19 -- Nigeria
Abstract
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Background
The relationship between the presence of antibodies to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and the risk of subsequent reinfection remains unclear.
Methods
We investigated the incidence of SARS-CoV-2 infection confirmed by polymerase chain reaction (PCR) in seropositive and seronegative health care workers attending testing of asymptomatic and symptomatic staff at Oxford University Hospitals in the United Kingdom. Baseline antibody

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