They have no idea how and when people become contagious, its different with everybody......its still their in the blood and fecal matter and urine........
The one thing and many are guilty of it, is walking round aircraft in socks or bare foot on long flights..........do not do this. Those aircraft plane floors are perfect breeding grounds for diseases.
I think “infectious” is highly subjective to the individual and circumstances of transmission. How was the virus transmitted? How did it bind to the host? Did it pass through the skin or was it ingested somehow? Where is the focal point of colonization on the host? This virus can bind to receptors in human skin, apparently just touching someone, according to CDC officials in the “hot zone” can transmit the virus to a new host.