A city in Brazil may have become immune to Covid-19: Study
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The Brazilian city of Manaus, which was devastated by the coronavirus pandemic, may have suffered so many infections that its population now benefits from “herd immunity,” according to a preliminary study.

• More than half the population seropositive

The study suggested that the coronavirus reached its peak in Manaus during March and April and the rate fell down in May and September.

Researchers found that in the peak, 44 % of the population were seropositive for the virus. This number was adjusted to 52 % after cases of false-negatives came to the picture.

• Seroprevalence declined

The study noted that seroprevalence declined in July and August due to waning antibodies.

The study estimated after data adjustment that the final epidemic size was 66 % in terms of seroprevalence.

The authors of the study noted that government measures may have helped in controlling the pandemic, but the “unusually high infection rate suggests that herd immunity played a significant role in determining the size of the epidemic.”

Health experts, however, have warned that deliberately raising herd immunity can have dangerous implications.

Source: https://www.medrxiv.org/content/10.1101/2020.09.16.20194787v1
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