Researchers suspect T-cells have such a large role in protecting the public from COVID -19 that herd immunity could be achieved at a 20 percent rate rather than the 60 to 80 percent assumed for other infectious diseases.
T-cells are a type of white blood cell that help individuals fight bacteria or viruses and may explain why some people who have been exposed to COVID-19 have never gotten sick. Researchers believe some individuals have acquired these cellular warriors by being exposed to coronaviruses in the past.
According to the U.S. Health and Human Services Public Data Hub, there have been more than 5.3 million confirmed cases of COVID-19 in the United States—1.6 percent of the population—and 168,696 deaths, as of August 17.
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