The difference between influenza A and B mainly includes different types of viruses and different intensity of transmission. 1. Different virus types: Influenza A is influenza A, influenza B is influenza B. The causative pathogens of the two are different. influenza A is caused by influenza A viruses and there are subtypes such as H1N1, H2N2, H7N9, etc. Influenza B is caused by influenza B viruses and does not do subtype classification. 2. Transmission intensity: Influenza A is more aggressive, more likely to cause complications, will spread among humans, poultry, livestock, easy to mutate, asymptomatic infected people are infectious, easy to cause widespread pandemics. b influenza attack is relatively weak, the main host for humans, the virus mutates more slowly, generally for local outbreaks. If the patient is not feeling well, he should seek medical attention for a clear diagnosis.