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The typical incubation period for influenza is 1â4 days (average: 2 days). Most healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick.he typical incubation period for influenza is 1â4 days (average: 2 days). Most healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick.
The incubation period is seven to 21 (usually 10 to 21) days after exposure to the herpes varicella-zoster virus to the development of the symptoms. The disease is most contagious a day or two before the rash appears and until the rash is completely dry and scabbed over, about five to six days after onset of the rash.