> It is also unknown whether the rates of infection observed in the cloth mask arm are the same or higher than in HCWs who do not wear a mask, as almost all par

> It is also unknown whether the rates of infection observed in the cloth mask arm are the same or higher than in HCWs who do not wear a mask, as almost all participants in the control arm used a mask. from the referenced study. The study doesn't say that cloth masks do nothing, they just say medical masks work better, they don't compare them to N95 masks either. There's other variables not controlled, the specific kind of virus etc.