The youngest volunteers so far to get experimental coronavirus vaccines have been given their first doses and are now being watched carefully to see if they are experiencing any unusual side effects.

A team at Cincinnati Children's Hospital vaccinated 100 children as young as 12 last week, said Dr. Robert Frenck, who is leading the trial for Pfizer's Covid-19 vaccine at the hospital. "Now we are pausing to watch for reactions to the vaccine. We right now are in a planned pause to make sure that everything is as safe as it can be," Frenck told CNN.

Among the side effects doctors are watching for are lumps, redness or pain at the site of the injection, as well as fever or aches.

Abhinav, 12, is one of the young volunteers. The seventh grader -- whose parents asked that only his first name be used to protect his privacy -- hopes that widespread vaccination will help make it safe for his grandparents to resume visits from India, and for classes to get back to normal at school

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