So Costa Rica is effectively adopting Mass Fever Treatment with hydroxychloroquine but not the less targeted Mass Drug Adminitration approach. Good for them, hope the WHO will recommend this soon to limit the pandemic worldwide.
So: how many of these enlightened countries using HCQ are also using Zinc? I suspect not so many?
There are obviously many details that might change effectiveness. I'd caution those here looking at evidence not to cherry pick:
Trial shows no results - because it has the wrong combo of drugs
Trial shows results - counted positive even if it has the wrong combo of drugs.
Standard practice is to work out the effective drugs first, then see how the combine.