<prompt> Which influenza strain was isolated in 1989 spreading to many other countries?H2N2H1N1H3N2H5N1  <response>: In 1989, epidemic - the reappearance of swine HINI virus Influenza can occur sporadically, as epidemics or pandemics In 2009, H1N1 Epidemic occurred in Mexico-recent Ref: Baveja 5th ed Pg: 468 