COVID-19 Vaccines May Be Reactogenic

COVID-19 Vaccines May Be Reactogenic
(AP Photo/Hans Pennink)

While the world awaits the results of large clinical trials of Covid-19 vaccines, experts say the data so far suggest one important possibility: The vaccines may carry a bit of a kick.

In vaccine parlance, they appear to be “reactogenic,” meaning they have induced short-term discomfort in a percentage of the people who have received them in clinical trials.

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