More than 80% of the passengers and crew infected with coronavirus on an expedition cruise ship did not show any symptoms, raising questions about the true prevalence of “silent” infections, according to a peer-reviewed study published Wednesday in Thorax.
The three researchers said their findings emphasize the need for accurate global data on the number of people, both symptomatic and asymptomatic, who have been infected with the coronavirus.
“It is difficult to find a reliable estimate of the number of COVID positive patients who have no symptoms,” Alan Smyth, professor of child health at the University of Nottingham and joint editor-in-chief of Thorax, said in a statement. “As countries progress out of lockdown, a high proportion of infected, but asymptomatic, individuals may mean that a much higher percentage of the population than expected may have been infected with COVID.”
It remains unclear what a wider prevalence of infection would mean. The World Health Organization cautioned earlier Wednesday that it’s unknown whether people who have been infected with the coronavirus are at risk of becoming infected again.
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