Final answer:
Type A influenza is the most widespread type of influenza, responsible for seasonal flu outbreaks and pandemics.
Step-by-step explanation:
The most widespread type of influenza is Type A. It is responsible for the majority of seasonal flu outbreaks and pandemics. Type A influenza viruses infect a wide range of animals including humans, birds, pigs, and even other mammals. They are characterized by their ability to undergo frequent genetic changes, which can lead to new strains that can easily spread and cause illness.
Learn more about Type A influenza