Flu A Vs Flu B Cdc. They can affect different populations more severely but have the same symptoms and treatment. During winter months, two types of influenza viruses, types a and b, cause outbreaks, though getting a flu shot can provide you with strong protection.
There are four types of influenza viruses, a, b, c, and d. The difference between seasonal flu and pandemic flu is whether or not people have had a chance to build immunity to the virus through previous exposure.
