Exactly right!  The 2005 study shows that HCQ was used to successfully SUPRESS SARS-1 and  SARS-2 which are corona viruses.  Before it was called covid-19, world renown Dutch virologist Dr. Ron Fouchier was the first to sequence this virus way back in 2013 and was able to determine that its almost identical to SARS-2.   This same virus was stolen from the Canadian Level 4 National Microbiology Lab in Winnipeg, Manitoba in 2019 by two Chinese spies and shipped to Wuhan where this same virus was weaponized.