The three factors that make an avian flu “dangerous” for humans are 1. Transmissibility from bird to human; 2. Contagiousness from human to human and; 3. Severity of disease in infected humans.
What the CDC is saying seems to be the opposite:
- Since H7N9 is not spreading easily from person to person at this time, CDC does not recommend that people delay or cancel trips to China. The World Health Organization also is watching this situation closely and does not recommend any travel restrictions.