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Thenew (or “novel”) coronavirusthat causes COVID-19 is one of several known to infect humans. Sometimes, a virus in animals crosses over into people. That's what scientists think happened here.So this virus isn't new to the world, but it is new to humans. When scientists found out that it was making people sick in 2019, they named it as a novel coronavirus. Researchers say kids have many of the same COVID-19 symptoms as adults, but they tend to be milder. Some children may be asymptomatic, but they can still spread the virus. Everything You Should Know About The 2019 Coronavirus And Covid The official UK government website for data and insights on coronavirus (COVID-19). The NIH scientists suggested that infection of the pulmonary system may cause an early “viremic” phase, in which the coronavirus is present in the bloodstream throughout the body. “This paper sheds some light, and may help explain why long COVID can occur even in people who had mild or asymptomatic acute ...