Which is more severe, Influenza A or Influenza B?

Both influenza A and B viruses can cause serious health problems, but generally, influenza A is considered to have greater potential for severity.

Influenza A, also known as avian influenza, is typically regarded as more severe. After infection with this influenza virus, the viral hemagglutinin binds to surface receptors of host cells, allowing the virus to enter cells, replicate, and spread, easily triggering a strong immune response and the release of large amounts of inflammatory factors, which may lead to severe clinical symptoms. Influenza A viruses can also circulate in animals such as birds and pigs, and sometimes cross the species barrier to infect humans, causing severe illness.

Influenza B primarily spreads among humans. Although it can also lead to severe disease, including pneumonia and other complications, its transmissibility and potential global impact are generally less than those of the influenza A virus. For infants, young children, or elderly individuals with weak immune systems, influenza B can also present as severe influenza and carries a certain mortality risk.

It is recommended to get vaccinated in a timely manner and maintain good personal hygiene habits. If experiencing any physical discomfort, prompt medical attention is advised.