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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 virusâ incubation period averages 25 days but can range from 15-30 days. Symptoms of infection include nausea, diarrhea, fever, jaundice, and anorexia. A vaccine is available, as well as an immunoglobulin shot that will prevent disease post-exposure.