https://freerepublic.com/focus/chat/3907739/posts?page=360#360
The study population “From May 12 to July 15, 2020, a total of 1848 of 3143 eligible recruits (58.8%) across nine recruit classes were enrolled in the CHARM study”.
Not surprised that negative controls were from July 2019. To be sure of negative, and to match the season.
thanx...makes sense...