Why swine flu is considered pandemic?
Pandemic in simple terms means a disease or condition that affects thousands of people across various regions at the same period of time. An interesting but disturbing feature noted in the swine flu pandemics is the variation of the structure of the influenza virus. The protein structure of the influenza virus had undergone modifications in the last two pandemic years 1957 and 1968 and same holds true for the recent pandemic in 2009.
