Study claims people were immune to Covid-19 before it existed
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Amid rising number of coronavirus cases across the world, a new study has claimed that people were immune to the virus before it's existence. Earlier in May, another study by researchers Alba Grifoni and others, also detected reactivity in 50 percent of donor blood samples obtained in the United States between 2015 and 2018. These studies gives a clear indication that some people were immune to Covid before it existed.