Chapter 21
Infectivity can last for as long as 2 days after resolution of symptoms. The virus particles are extremely hardy; their infectivity persists after exposure to acid, ether and heat (60o C for 30 min). 2. What is known about the pathogenesis of the infection? The incubation period is 24-48 hours, and the mean duration of illness is 12-60 hours. ................
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