RT @NewsTMac: Dr Michael Ryan of WHO on the concept of “herd immunity”. Worth a listen. https://t.co/ujAyAYY2G9 0 atbildes

	Didzis Dejus (2020-05-12 23:26:43) @twitter	RT @NewsTMac: Dr Michael Ryan of WHO on the concept of “herd immunity”. Worth a listen. https://t.co/ujAyAYY2G9