Swine Flu' Strain Has Passed from Humans to Swine Nearly 400 Times Since 2009 July 27, 2023 — A new study of the strain of influenza A responsible for the 2009 H1N1 pandemic -- pdm09 -- shows ...
Swine flu, also known as swine influenza, is a respiratory illness caused by the influenza A virus subtype H1N1. It is called swine flu because the virus jumped to humans from pigs. Here are some ...