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Chinese COVID-19 vaccine maintains protection in variant-plagued Brazil

As potentially more dangerous coronavirus variants spread worldwide, scientists and clinicians have raced to discover how well the available COVID-19 vaccines protect against the mutant strains. Preliminary results from a large study of health care workers now suggest one dose of CoronaVac, a vaccine developed by a Chinese company, is […]

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From Vaccine Nationalism to Vaccine Equity — Finding a Path Forward

The global effort to develop safe and effective Covid-19 vaccines has yielded remarkable results, owing in part to early, decisive investments in clinical discovery through efforts such as Operation Warp Speed. These achievements highlight the payoff of stable, long-term support of basic research and immunology: our scientific community was prepared […]

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Antibody Responses in Seropositive Persons after a Single Dose of SARS-CoV-2 mRNA Vaccine

The efficacy of two injections of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike messenger RNA (mRNA) vaccines (BNT162b2 [Pfizer] and mRNA-1273 [Moderna])1 in preventing symptomatic SARS-CoV-2 infection in persons without previous coronavirus disease 2019 (Covid-19) has been shown to be high. We wondered what the response would be to the […]

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