Three, if by air.
Sepkowitz
Kent A
KA
Farr
Barry M
BM
D000391:Air Microbiology; D001228:Aspergillosis / Q000517:prevention & control / Q000635:transmission*; D003428:Cross Infection / Q000382:microbiology / Q000635:transmission*; D006801:Humans; D017053:Infection Control; D014376:Tuberculosis / Q000517:prevention & control / Q000635:transmission*; D014481:United States