Anna Camp opened up in an Instagram post about her recent COVID-19 diagnosis, and pleads with her followers to wear a mask.

She says she believes she contracted the virus the one time she didn’t wear a mask. Camp says she was “incredibly safe”, wearing a mask and using hand sanitizer.

Then, “one time, when the world was starting to open up, I decided to forgo wearing my mask in public. One. Time. And I ended up getting it.”

She describes being “extremely sick” for more than three weeks, and still experiencing lingering symptoms.