This 12-year-old is happy to be testing a Covid-19 vaccine - CNN

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.

When asked why he signed Abhinav up for the trial, he said, "I think primarily to protect my son.

We felt it was a thing to do."

Sharat, himself a physician at the hospital, volunteered for the Phase 1 test of the vaccine earlier this year and felt confident it would be not only safe for his son, but would prevent the virus from infecting him.

"I am aware of the side-effects affecting the AstraZeneca vaccine," he said.

Frenck said people may be nervous about giving children an experimental vaccine but noted Pfizer's has already been tested in tens of thousands of adults.

"The reason we can use this vaccine in children is that Pfizer has 30,000 adults who have been enrolled and it has safety data from all those people," he said.

Plus, he said, it will be important to vaccinate children against coronavirus if there is to be any hope of controlling the pandemic.