Most people who are infected by the SARS-CoV-2 virus, that causes Covid-19, are not asymptomatic throughout the course of infection, a review of studies carried early in the pandemic suggests. While some people who contract the novel coronavirus never experience any symptoms, there remains disagreement about what proportion of total infections these cases represent. The latest study, published in the journal PLOS Medicine, suggests that true asymptomatic cases of SARS-CoV-2 comprise a minority of infections. According to the researchers at the University of Bern, Switzerland and colleagues, the full spectrum and distribution of the severity of COVID-19 symptoms are not well understood.
Some people with the virus may experience severe infections resulting in viral pneumonia, respiratory distress syndrome, and death, while others remain completely asymptomatic or develop…