European Review for Medical & Pharmacoloical Sciences. 24: 4539-4547.
Using information from the WHO, ISI-Web of Knowledge, Thomson Reuter journals, PubMed, Medline, and clinical trial registries, the authors concluded their findings support the hypothesis that HCQ has efficacy in treatment of Covid-19.
The authors say the basic science in vitro suggests that these drugs can inhibit COVID-19 infections, but it is not conclusive. They say that clinical and consensus data from the literature is also suggestive (but not conclusive) that both drugs can successfully treat the infection.
They also established a clear link between the cases of COVID-19 worldwide with the cases of malaria, as quoted below, and illustrated in the chart above.
QUOTE: “We found that COVID-19 infections are highly pandemic in countries where malaria is least pandemic and are least pandemic in nations where malaria is highly pandemic.”
NOTE: While one may possibly surmise the connection means you can get either Covid-19 or malaria, but not both, it does seem more probable that the long-established treatment/prevention for malaria — HCQ — prevents Covid-19.