translation.en: At least some of the three pandemics during the last (20th) century are thought to have come from an animal or bird influenza virus that itself mutated or swapped genes with a human influenza strain (so called recombination) and acquired the ability to both infect humans and, more importantly, spread between them.
translation.ga: Síltear gur tháinig trí phaindéimeach le linn na haoise deiridh (20ú) ó víreas fliú ainmhí nó éanúil a bhí sóite nó a d'aistrigh géineacha le leithchineál an fhliú daonna (comhchuigriú mar is fearr aithne air) agus d'aimsíodar ábaltacht le daoine a ionfhabhtú agus, níos tábhachtaí, an víreas a leathnú ina measc.