Resurgence of Covid-19 in Brazil`s Amazon Dashes Hopes of Herd Immunity
(World News Brazil)

The largest city in Brazil’s Amazon has closed bars and river beaches to contain a fresh surge of coronavirus cases, a trend that may dash theories that Manaus was one of the world’s first places to reach collective, or herd, immunity. When a large portion of a community becomes immune to a disease, its spread becomes unlikely. University of S�o Paulo (USP) researchers suggested that a drastic fall in Covid-19 deaths in Manaus pointed to collective immunity at work, but they also believe that antibodies to the disease after infection may not last more than a few months. Local authorities on Friday enforced a 30-day ban on parties and other...