The Frequency Distribution of Cases Affected by Influenza A (H1N1) Based on Demographic Characteristics During 2008 – 2009 in Yazd Province (Iran)

Abstract

Background: Human influenza is an acute and self-limited disease that is caused by viruses including types A, B, C. These viruses are related to RNA viruses and belonging to the family of Orthomyxoviridae. They are divided into other sub-species based on surface antigens, including hemagglutinin (H) and neuraminidase (N). The new virus of the group that was isolated from swine was called as influenza A (H1N1) virus.