The large number of people already infected with the coronavirus in the US has begun to act as a brake on the spread of the disease in hard-hit states.
Millions of US residents have been infected by the virus that causes covid-19, and at least 160,000 are dead. One effect is that the pool of susceptible individuals has been depleted in many areas. After infection, it’s believed, people become immune (at least for months), so they don’t transmit the virus to others. This slows the pandemic down.
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