translation.en: At irregular intervals, usually of a few decades, a new influenza virus emerges which is novel to all or most people which means that there can be little specific immunity among humans.
translation.is: Á nokkurra áratuga fresti, en þó óreglulega, birtist nýtt inflúensuafbrigði sem kemur öllum eða næstum öllum jarðarbúum í opna skjöldu.