America’s falling Covid case rate, in 3 charts New cases have fallen 57 percent since early September, with experts attributing the fall to increased immunity. NBC News

The number of new Covid-19 cases in the United States has dropped by nearly a quarter in the last two weeks, further signaling a downward trend in the country’s fourth wave of the pandemic.

The country has averaged about 70,000 new cases per day from Oct. 14 to Oct. 27, a decrease of 22 percent from the two weeks prior. The number of Covid-related deaths also dropped during that time by about 14 percent.

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Shaun Truelove, an infectious diseases scientist at the Johns Hopkins Bloomberg School of Public Health, attributes the drop in cases to a combination of immunity from vaccination and people who have already had a Covid infection. ...