H3N2 has increased from 1% in 1994 to 12% in 2003 to 91% in 2005 . [4] [5] "[C]ontemporary human H3N2 influenza viruses are now endemic in pigs in southern China and can reassort with avian H5N1 viruses in this intermediate host." [6] Electron micrograph of avian flu viruses ( Source: