Guessing cargo planes fly themselves so there is no worries there are any sick crew on board. Guess all the crates and contents of the crates were never touched by sick human hands. What the heck was the point of only stopping passenger planes?
the point of concern would be the private transportation and hotels the crews use. Cargo is netted and palletized so the load doesn’t shift during flight. These pallets are unloaded with either a forklift or scissorlifts, put on a truck and offloaded at the airport warehouse for sorting or staging. The ground crew will have no contact with the flight crew. and neither will the warehouse folks. The flight crew are regulated by FAA regulations to travel to and from the hotel as a group on private vehicles, check temps 2x day and subject to 14 day quarantine. Since there’s no stewardesses, it will be the Captain who is designated to report any sickness enroute. Flight crew being generally intelligent people with a vested interest in staying infection-free, they wouldn’t cover for a sick crewmember. I’d put air cargo in the low-risk category.