Received my first covid shot of moderna in june. returned in july and accidentally receive a first shot of pfizer. what should i do?

There is a study confirming the efficacy of using two different types of COVID 19 vaccination. There may be a third administration required. Please check back with your PCP or Healthtap for the latest updates.

Officially, CDC and many other experts advise against mixing vaccine types. However, research has shown no increased risk of side effects and probably equal effectiveness when people get both Pfizer and Moderna vaccines. And several other countries' public health experts say it's OK. But to be maximally protected, you still should get a second dose of one vaccine or the other.