NIH Dir. Francis Collins tells ABC News' BobWoodruff that data to find COVID-19 vaccine is 'encouraging'—'as long as everybody understands: first has to mean really effective and completely safe.'
vaccine candidates, provides reassuring glimmers of hope that scientists are on track to develop an effective and safe vaccine at record speed.
According to the World Health Organization , there are at least 23 COVID-19 vaccine candidates that have progressed to various stages of human studies. So far, several of these candidates have showed promising preliminary data from their early clinical trials, either in peer-reviewed journals, directly online to preprint servers or in press releases.
A subject receives a shot in the first-stage safety study clinical trial of a potential vaccine by Moderna for COVID-19, the disease caused by the new coronavirus, at the Kaiser Permanente Washington Health Research Institute in Seattle, March 16, 2020.Also on Monday, CanSino Biologics released data in the Lancet that showed similar results. And last week, the U.S.
According to Goepfert, antibodies protect against infection, while T-cells -- especially a specific subtype known as killer T-cells -- attack previously-infected cells and are very good at preventing disease.
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