Final answer:
Type A influenza is the most widespread.
Step-by-step explanation:
The most widespread type of influenza is Type A. Type A influenza viruses are found in animals, birds, and humans. They are known to cause global outbreaks or pandemics. An example of a Type A influenza virus is the H1N1 virus that caused the 2009 swine flu pandemic.
Learn more about Type A influenza