Incubation period of influenza A and B in children

The incubation period for influenza A and B in children typically refers to the phase after infection with the influenza A or B virus but before any typical symptoms appear. Influenza A and B viruses are both causes of acute viral upper respiratory tract infections, transmitted via respiratory droplets. The incubation period generally ranges from 14 to 21 days, with influenza A usually having a longer incubation period than influenza B—typically between 14 and 18 days, while influenza B has an incubation period of approximately 14 to 16 days. The length of the incubation period depends on factors such as the virulence of the infecting virus strain, the host's immune resistance, and the individual's immunity. During the incubation period, infected individuals can transmit the virus to others without showing any symptoms. Therefore, controlling transmission during this asymptomatic phase is one of the key preventive measures for airborne infectious diseases.