By William Moss, Executive Director | Published by John Hopkins University of Medicine Coronavirus Resource Center

The views and opinions expressed here are those of the authors and do not necessarily reflect the position of either Johns Hopkins University and Medicine or the University of Washington.

• Rumors and conspiracy theories about Covid-19 vaccines are circulating, but it is critical to separate fact from fiction.
• As with shingles and flu vaccines, the Pfizer and Moderna mRNA vaccines cause expected and temporary side effects – local inflammation (redness and swelling) at the site of injection or more generalized reactions such as fever and muscle aches.
• We will learn much more about side effects associated with the mRNA vaccines as more people are vaccinated – including more about vaccine safety in children younger than 16 years of age, pregnant and lactating women, and immunocompromised individuals.

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