But chloroquine is not successful against the virus because it is an anti malarial drug, but because it is also a zinc ionophore (forcing zinc into the cells where it inhibits the activation of the virus RNA). So not everything that cures malaria cures the virus.  Maybe there are low cases of CV19 in areas with high malaria because nobody goes there. Or because many people take chloroquine as precaution (not a good idea against the virus: you need fever to activate the immune system, timing is essential).  In India, many people take also antibiotics as precaution, creating high antibiotica resistance: https://resistancemap.cddep.org/AntibioticResistance.php The virus does not kill directly, but destroyes the cells in the lungs and paves the way for fungi and bacteria that overwhelm the body. That's when you need antibiotics that still work, and that could become a major problem in India (same in Italy).