Researchers found that after exponential growth in Manaus, cases and deaths started to drop significantly, without major interventions taking place.
According to a Reuters report from May, authorities in Manaus struggled to keep pace with burials. It said the State of Amazonas, in which Manaus is the capital, had a death rate of 19.4 per 100,000, compared to 4.4 for Brazil as a whole.
In August, researchers noticed the fall in cases in Manaus and suggested herd immunity may have played a role. They said that while there may have been a change in behavior among the city residents that helped limit transmission,"the unusually high infection rate suggests that herd immunity played a significant role in determining the size of the epidemic."
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