How long after exposure to h1n1 do symptoms appear？ And how long a h1n1 patients will have exposure symptoms? Answer: Incubation period is one to seven days,If seven days without any discomfort,You Can remove isolation,General symptoms in 1-2 days.. TIP: Preclinical,Time longer than theAvian influenza, incubation period. Influenza pandemic with the early symptoms H1N1 ordinary [...]