'Swine flu' strain has passed from humans to swine nearly 400 times since 2009, study finds - Medical Xpress
medicalxpress.comSubmitted by medicalxpress5525 in health
A new study of the strain of influenza A responsible for the 2009 H1N1 pandemic—pdm09—shows that the virus has passed from humans to swine about 370 times since 2009, and subsequent circulation in swine has resulted in the evolution of pdm09 variants that the…