Swine flu is a respiratory illness caused by the H1N1 influenza virus. It's called "swine flu" because it was originally thought to be a virus that mainly affected pigs. However, this virus can also infect humans. Find out how it spreads and what its symptoms are. To learn with Home Revise Home Tutor, Call 91 8010 963 963 . . . #swineflu #viraldisease #h1n1virus #influenza #infectiousdisease #respiratoryillness #biology #biologynotes #studyreels #schoolnotes #studynotes #exampreparation #studyin