Coronavirus: Four warning signs indicating emergence of dangerous strains

"The more people infected in a population, the greater the chance of strains emerging," says a coordinator of the Brazilian diagnostics network, which links different universities and research institutes in Brazil to tackle the pandemic.

RIO DE JANEIRO, BRAZIL - The UK was in lockdown in November 2020. No one could leave their homes except for essential activities, such as going for groceries. Gradually, infection rates began to drop in the country, except in Kent.

Despite strict rules against movement of people, Covid-19 continued to spread in that southeastern English county, quickly overwhelming hospitals with infected patients.

In South Africa, in October 2020, a new wave of Covid-19 suddenly began to sweep into the Eastern Cape province. The infection rate was much higher than in other areas of the country, where the number of . . .

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