Introduction: Influenza viral infections cause a broad array of respiratory diseases that are responsible for
significant morbidity and mortality in children.
Influenza A viruses also have potential to cause periodic global Pandemics with higher penetration of illness
than seasonal epidemics. Swine origin Influenza has become the first pandemic of the 21st century. The currently
circulating strain of swine origin influenza virus, the H1N1 strain has undergone triple reassortment and contains
genes from the avian, swine and human viruses. This virus was first reported in Mexico in April 20095 and spread
to various countries worldwide. Higher morbidity (27236 cases) and mortality (981 deaths) have been reported from
India. As per WHO, the Pandemic influenza A (H1N1) virus is now considered as seasonal virus.