Some otherwise healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 to 7 days. Period of Contagiousness People with flu are most contagious in the first 3-4 days after their illness begins.
Cdc Seasonal Influenza Flu Weekly Report Influenza Summary Update
In general the incubation period for influenza is estimated to range from 1 to 4 days with an average of 2 days.
Influenza incubation period. Virus can be detected in the upper airway for up to 1 day before symptoms start and around 35 days after illness finishes in. The incubation period of influenza is usually two days but can range from one to four days. Additional symptoms may include runny nose headache a burning sensation in the.
People with flu are most contagious in the first 3-4 days after their illness begins. Uncomplicated influenza signs and symptoms typically resolve after 3-7 days for the majority of people although cough and malaise can persist for 2 weeks especially in elderly people and those with chronic lung disease. The incubation period for influenza averages 2 days range 14 days and the serial interval the mean interval between onset of illness in 2 successive patients in a chain of transmission is 24 days.
These factors enable influenza to. The incubation period of influenza is 2 days long on average but may range from 1 to 4 days in length. Ascertainment of the incubation period for influenza virus H5N1 is important to define exposure periods for surveillance of patients with suspected influenza virus H5N1 infection.
Incubation period is the time elapsed between exposure to a pathogenic organism a chemical or radiation and when symptoms and signs are first apparent. Influenza A viruses can also cause sporadic infections or spread worldwide in a pandemic when novel strains emerge in the human population from an animal host. No study has specifically focused on the incubation period for human-to-human H7N9 virus transmission.
However this estimate may change as we learn more about the virus. The incubation period for H7N9 virus infection has been estimated to be 37 days 4 6. Limited data on the incubation period suggest that illness onset occurs 7 days after the last exposure to sick or dead poultry 1 4.
Theres no exact time frame thats the same for every person with the flu but in general the CDC says that the incubation period of the flu can range between one and four days with the average. The incubation period for influenza is usually 2 days but ranges from 1 to 4 days. However the incubation period estimated in these studies primarily reflects sporadic poultry-to-human transmission.
The World Health Organization WHO note that the typical incubation period for the flu is about 2 days but that it can range from 1 to 4 days. Some people especially young children and people with weakened. What are the symptoms of influenza.
Also viral excretion peaks early in illness. In a typical infectious disease the incubation period signifies the period taken by the multiplying organism to reach a threshold necessary to produce symptoms in the host. Typical influenza disease is characterized by sudden onset of fever aching muscles sore throat and non-productive cough.
Clinical illness follows a short incubation period and presentation ranges from asymptomatic to fulminant depending on the characteristics of both the virus and the individual host. The average incubation period seems to be around 5 days. Some otherwise healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick.
