H1N1 virus is sometimes mentioned in the news with reference to which one of the following diseases?

H1N1 is a subtype of the Influenza A virus that primarily affects pigs and was responsible for the 2009 global pandemic known as Swine flu. While Bird flu is also an avian influenza, it is typically associated with the H5N1 or H7N9 strains rather than H1N1. This question tests the core concept of identifying specific viral strains associated with major public health outbreaks and infectious diseases.