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There are more than 200 COVID-19 vaccines in development as
drug companies race to be first to develop a successful vaccine and, so far,
clinical trials have produced mixed findings.
Scientists, using both newer and traditional technologies, have
reported both positive and negative outcomes, including side effects such as
fatigue and chills, and a more serious risk with one vaccine that actually
enhances the disease.
Source: MedPage
Today August 6, 2020