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Articles on Epidemiology

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Friaaz Azeez gets tested for COVID-19 by a health-care worker at a pop-up testing centre at the Islamic Institute of Toronto in Scarborough, Ont., on May 29, 2020. THE CANADIAN PRESS/Nathan Denette

‘What do you mean, it was a false positive?’ Making sense of COVID-19 tests and terminology

Understanding terms like sensitivity and specificity can help us make sense of COVID-19 testing, the accuracy of tests and what the results mean.
On Aug. 11, Russian President Vladimir Putin announced that a coronavirus vaccine developed in the country has been registered for use. Russian Health Ministry/Handout/Anadolu Agency via Getty Images

A COVID-19 vaccine needs the public’s trust – and it’s risky to cut corners on clinical trials, as Russia is

As Russia fast tracks a coronavirus vaccine, scientists worry about skipped safety checks – and the potential fallout for trust in vaccines if something ends up going wrong.
Health care workers use a nasal swab to test a person for COVID-19 in Pembroke Park, Florida. Joe Raedle/Getty Images News via Getty Images

Video: What the huge COVID-19 testing undercount in the US means

A recent report by the CDC estimated that the true number of COVID-19 cases in the US could be six to 24 times more than the number of confirmed cases. A public health scholar explains the implications.
By setting out the continent’s research priorities, scientists can focus better on what needs to be done. Maliutina Anna/Shutterstock

Africa’s scientists set out their COVID-19 research priorities

Some of the priorities were drawn from the World Health Organisation's Roadmap; others were expressed by researchers in and from Africa as being important to the continent's many contexts.

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