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.ga: Ag eatraimh neamhrialta, go hiondúil cúpla scór bliain, tagann víreas nua chun cinn atá urnua do mhóramh na ndaoine nó gach duine, a chiallaíonn gur beag imdhíonacht atá i measc daoine.