@duke You can't get vaccinated in Cali either. The process is crap as appointments + ID + proof of residence required (utility bill). Getting an appointment is like a lottery. In my county, there are four locations doing 60 jabs an hour, and a week's worth of appointments are booked in less than an hour. Then there are side effects to the vaccine. I suffered for 10 days but some folks have no problem at all.
I tried to find info on transit passengers but no luck. Travelers from China rules are different depending on if you are a US citizen or not. Lots of restrictions if you want to enter from China.