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. 2007 Dec 10;35(10):S27–S64. doi: 10.1016/j.ajic.2007.07.001

Table 6.

Infectious doses for viruses that cause respiratory diseases

Virus Minimal infectious dose associated with intranasal inoculation
Respiratory syncytial virus 100-640 TCID50
Rhinovirus 0.032-0.4 TCID50; also cited as 1-10 TCID50
Influenza 2-790 TCID50
Parainfluenza 1.5-80 TCID50

From Boone and Gerba.94