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b'"This is an invisible war and if we don\'t use our weapons we are not going to win it." -Ester Sabino\\n\\nIn the fall of 2020, the Brazilian city of Manaus had the highest SARS CoV-2 infection rate in the world \\u2014 possibly as high as 75 percent. Some speculated that with rates of infection this high, there would not be enough people left for the virus to infect. Had the city reached so-called natural herd immunity? For a few months cases started to drop but this winter things got worse than ever. We\\u2019ll hear what caused this devastating second wave in Manaus, why herd immunity from natural infection wasn\\u2019t protective, and why \\u2014 even with vaccines \\u2014 we can\\u2019t let our guard down.\\n\\nThis podcast was created by Just Human Productions. We\'re powered and distributed by Simplecast. We\'re supported, in part, by listeners like you.\\n\\n#SARSCoV2 #COVID19 #COVID #coronavirus'