It seems that the authors misunderstood the Boston study they are citing: > In a Boston homeless shelter, 100% of 147 COVID-19 positive subjects were asymptoma

It seems that the authors misunderstood the Boston study they are citing: > In a Boston homeless shelter, 100% of 147 COVID-19 positive subjects were asymptomatic [3]. That study actually excluded N=15 symptomatic people: > The original cases (N=15) were identified sequentially over a 5-day period, and each was expeditiously removed from the shelter population at the time of symptom recognition. These individuals predated the implementation of universal testing procedures and are excluded from this study. So, it's rather unsurprising that 100% of the remaining people were asymptomatic.