US health officials are on alert for more cases of a new strain of swine flu were found in three children in Iowa this month.
Ten people in the United States have been infected since July by S-OtrH3N2 virus that takes genes from the 2009 H1N1 swine flu pandemic.
New flu strains combining rare influenza virus (H3N2) in circulation in the North American swine and H1N1 virus from outbreaks.
New flu Strain started when influenza virus combines with a new way.
They may pose a health risk because people have not enough develops immunity to them, ABC News reported.