human
What are the different types of flu viruses?
assistant
The different types of flu viruses include Influenza A, B and C. Influenza A is further divided into subtypes based on the type of surface proteins they possess (H1N1, H2N2, etc.). Influenza B can be subdivided into two groups, Victoria and Yamagata, based on their genetic makeup. Influenza C is a single strain virus that has not yet been sub-divided into subtypes.