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Evidence and experts to help you understand today’s public health news—and what it means for tomorrow.

Aug 20, 2021

I am fully vaccinated with the Moderna vaccine. If I catch the delta variant will I acquire additional immunity—in addition to the immunity to the vaccination? If I received the COVID-19 vaccine and I’m now breastfeeding, will my baby receive antibodies? Do masks get less effective depending on how long they’re worn?

Dr. Amesh Adalja of the Johns Hopkins Center for Health Security addresses your questions submitted to