Does the airport has a site to test for PCR Covid 19 where the result is quick? We need a negative test for Covid for our flight to Viet Nam on Janaury 19 arriving on January 21, 2022.

All airports have a medical area. I didn't see a test site. You can google free testing sites in your area and be ready for your trip

I don't know if they have a test site at SFO what I do know that everyone is doing their part of wearing a mask 😷

Yes,they have a medical center where they do the PCR but I don't know if they are fast but also you can have the J&J vaccine if you request it.