Dr. Angela Shen of Children's Hospital of Philadelphia, answers COVID-19 vaccine FAQ - Efficacy, side effects, and Pfizer vs. Moderna

Vaccines are being distributed around the country, leading to several questions about what the vaccine actually does and when will you receive it. Dr. Shen answers that and more.

PHILADELPHIA (WPVI) -- Host Matt O'Donnell interviews Dr. Angela Shen, Scientist and Vaccine Education Specialist for Children's Hospital of Philadelphia (CHOP).

They discuss the multiple COVID-19 vaccines on the market today and those coming to market soon. Dr. Shen also discusses the efficacy and side effects of the vaccines, the federal mission to educate the public, and the true definition of 'herd immunity'.

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CHOP Dr. Angela Shen answers FAQ on COVID-19 vaccines