The deadly COVID-19 disease which has so far claimed more than 362000 people is believed to one of the worst world’s pandemics on record. But the real plague is yet to come and when it happens it could wipe out half of the world's population a scientist has warned. Dr Michael Greger the author of the best-selling book ‘How Not To Die’ claims that chickens could be the cause of the next deadly pandemic and the worst kind. According to him an apocalyptic virus from chicken farms could lead to a more dangerous pandemic than COVID-19 and wipe out half