Read the following article and summarize into 2 paragraphs what you learned
Antigenic and Genetic Characteristics of Swine-Origin 2009 A(H1N1) Influenza Viruses Circulating in Humans
Rebecca J. Garten
Published Online 22 May 2009
Science 10 July 2009:
Vol. 325 no. 5937 pp. 197-201
DOI: 10.1126/science.1176225
link
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3250984/