epidemicity การใช้

The influenza virus has also caused several pandemic threats over the past century, including the pseudo-pandemic of 1947 ( thought of as mild because although globally distributed, it caused relatively few deaths ), The level of preparedness was further increased and sustained with the advent of the H5N1 bird flu outbreaks because of H5N1's high fatality rate, although the strains currently prevalent have limited human-to-human transmission ( anthroponotic ) capability, or epidemicity.