Groundbreaking Study Explains ‘Preexisting Immunity’ to Covid-19 Among Some Populations

By Ilya Tsukanov – Sputnik – 23.01.2021 SARS-CoV-2, better known simply as the ‘new coronavirus’, is just one of a handful of related RNA viruses that cause respiratory illnesses of varying severity among humans and some animals. Past infections by other coronaviruses help the human immune system fights SARS CoV-2. That’s the conclusion reached by […]