The incubation period of avian influenza is generally 2-4 days, very few up to 8-9 days, the vast majority do not exceed 1 week. The length of the incubation period of avian influenza is closely related to the mode of exposure, if direct contact with live birds with the virus or sick or dead birds, the amount of infected virus is larger, and the incubation period is relatively short. If you are infected with the avian influenza virus through contact with the environment, the amount of infected virus is small and the incubation period is relatively long, but it is generally rarely more than 1 week. There are many subtypes of viruses that cause avian influenza, and the incubation period may vary slightly between subtypes, but overall it is relatively similar. The two subtypes that have caused larger pandemics are H5N1 and H7N9. There have been studies showing that the median incubation period for human infection with H5N1 avian influenza is 3.3 days, and for human-to-human clusters, the incubation period for re-emerging cases is 3-5 days, with individual cases lasting up to 8-9 days. the incubation period for H7N9 avian influenza is 3.1-3.4 days, similar to that of H5N1. The main source of infection of avian influenza is a variety of birds, including waterfowl and flying birds, and people engaged in poultry breeding, trafficking, slaughtering, processing and working in live poultry markets are at high risk and need to always pay attention to prevent infection with the avian influenza virus. After contact with poultry, once within 1 week there is a fever, sore throat, cough, headache, muscle aches and other manifestations, or general malaise, weakness, runny nose, nasal congestion, diarrhea, nausea, vomiting, the appearance of conjunctival congestion and other symptoms, you need to promptly go to the hospital for treatment.