Covid test

I used to work in a poultry processing plant and once in a while a USDA inspector would randomly check the birds for salmonella and find 30 or 40% were contaminated. The last things that happens to the birds is that they pass through a large tank filled with ice water to cool them down for shipping. At any given time there are 4 or 5,000 birds in the tank and they are in there mixing for 40 minutes. If even one bird was contaminated they would all be when the left the tank. Today's news said that in some over crowded facilities at the border as many as 10% test positive for Covid. This virus is easy to transfer and in these close quarters where the people stay up to a week, it is likely that they will all test positive.