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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
