Simple, familiar tactics can rein in the COVID variant

Steep declines in delta variant outbreaks in India and, more recently, the U.K., are likely not due to the nations reaching «herd immunity» or viral behavior, but rather because of shifts in human behavior prompted by mounting cases and deaths, Harvard experts say.

Those outbreaks appeared to follow similar courses: a rapid increase in cases followed by an equally rapid decline. In India, that progression took roughly three months. Cases began rising in March, took off in April, and declined in May and June, settling at levels slightly higher than those in the spring, according to World Health Organization data. In the U.K., meanwhile, cases rose relatively rapidly in June, peaked in July, and then declined before reaching a rough plateau in recent weeks that, though significantly lower, remains high enough to be a matter of concern to experts.

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