...a prophylactic may be used not only to treat, but mainly to prevent illness.
Therefore, in a population that routinely and frequently ingests hydroxychloroquine it makes since to use an alternate if the disease has occasionally defeated the primary or initial treatment/protection. The treatment may very well have been effective in populations where it has not been widely used. The question is not just what alternate treatment they used. The more important question here is WHY HAS THE NEED FOR TREATMENT BEEN SO LOW when you would expect the infection rate to be equivalent to other places? Hyroxy -- 😊?