So this guy somehow was exposed to the Hamilton Air force Base batch.
Hamilton Air Force base???
I found this, from yesterday....
...An international traveler who arrived before dawn Monday at Naval Base Ventura County at Point Mugu has been put under a federal 14-day quarantine for coronavirus, officials said.
The U.S. Department of Health and Human Services said Sunday in a statement that the base could house passengers arriving at Los Angeles International Airport. The department was not immediately available to comment on how many travelers could be sent to the Point Mugu location....
Hamilton Air Force Base hasn’t been a thing for 30 years. Maybe you mean Travis AFB? Solano County is where it is. So it seems likely something went FUBAR and it was spread at Travis.