GOOGLE: There are three types of influenza viruses: A, B, and C. Major epidemics are caused by A and B, and it is usually these two varieties that cause the flu. They have a diameter of about 100 nanometers, making them a medium sized virus.
MORE GOOGLE: Influenza is caused by infection of the respiratory tract with influenza viruses, RNA viruses of the Orthomyxovirus genus. Influenza viruses are classified into 4 types: A, B, C, and D. Only virus types A and B commonly cause illness in humans.
ONE MORE GOOGLE: In the past, it was thought that infection with influenza A was more severe than infection with influenza B. However, a 2015 study in adults with influenza A and influenza B found they both resulted in similar rates of illness and death.
I hope this helps! I honestly don't know what the flu pathogen is either but I guess Google might have helped you a bit..? Sorry I couldn't answer properly. Goo luck!
