Influenza virus is a common human pathogen that has caused serious respiratory illness and death over the past century It has the potential to cause widespread pandemics A pandemic occurs when a new type of influenza strain appears Swine
influenza has come It has affected a large number the swine flu (H1N1) virus the United States and elsewhere have put the health authorities Swine flu virus to cause infection Swine flu virus generally circulates throughout the year the Centers Control and Prevention (CDC) have received reports