Eurosurveillance | Estimating the asymptomatic proportion of coronavirus disease 2019 (COVID-19) cases on board the Diamond Princess cruise ship, Yokohama, Japan, 2020 User half-taught-wrong, in the /r/medicine: a subreddit for medical professionals subreddit, 19 Mar 2020
50% of People who tested positive for COVID-19 on Diamond Princess cruise were fully asymptomatic. User SufficientHistorian6, in the conspiracy subreddit, 19 Mar 2020
Study finds that 17.9% of positive cases are asymptomatic (Diamond Princess cruise ship data) User PumpkinCrumpet, in the CoronavirusUS subreddit, 19 Mar 2020
20% on the cruise ship got the infection after a month in close quarters 13% had NO SYMPTOMS. Over half. All 3k were tested. User NosuchRedditor, in the Conservative subreddit, 17 Mar 2020