A vast majority of those testing positive for SARS-CoV-2 are asymptomatic. They simply aren’t sick. The PCR test is merely picking up inactive (noninfectious) viral particles.
In one study, which looked at pregnant women admitted for delivery, 87.5% of the women who tested positive for the presence of SARS-CoV-2 had no symptoms.
A study looking at PCR test data from nearly 10 million residents in Wuhan city found that not a single one of those who had been in close contact with an asymptomatic individual tested positive.
Of the 34,424 residents with a history of COVID-19, 107 individuals tested positive a second time, but none were symptomatic and none were infectious.
When asymptomatic patients were tested for antibodies, they discovered that 190 of the 300, or 63.3%, had actually had a “hot” or productive infection resulting in the production of antibodies. Still, none of their contacts had been infected