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Because of the way they are constructed, Randomized Control Trials will never show any benefit for any antiviral against COVID-19. Not Remdesivir, not Kaletra, not HCQ, and not Ivermectin. The reason for this is simple; for the patients that they have recruited for these studies, such as Oxford’s ludicrous RECOVERY study, the intervention is too late to have any positive effect. The clinical course of COVID-19 is such that by the time most people seek medical attention for hypoxia, their viral load has already tapered off to almost nothing. If someone is about 10 days post-exposure and has already been symptomatic for five days, there is hardly any virus left in their bodies, only cellular damage and derangement that has initiated a hyperinflammatory response. It is from this group that the clinical trials for antivirals have recruited, pretty much exclusively. In these trials, they give antivirals to severely ill patients who have no virus in their bodies, only a delayed hyperinflammatory response, and then absurdly claim that antivirals have no utility in treating or preventing COVID-19. These clinical trials do not recruit people who are pre-symptomatic. They do not test pre-exposure or post-exposure prophylaxis. This is like using a defibrillator to shock only flatline, and then absurdly claiming that defibrillators have no medical utility whatsoever when the patients refuse to rise from the dead. The intervention is too late. These trials for antivirals show systematic, egregious selection bias. They are providing a treatment that is futile to the specific cohort they are enrolling. |
And here is a study which looks at viral load since days of symptom onset, showing that at the 72 hour mark there is still plenty of Covid-19 in the body: https://www.nature.com/articles/s41591-020-0869-5
I am not a medical expert, so there may be things to criticize about these studies. All I meant to point out is that people are looking into / have looked at the questions you raise. Doctors and nurses are pretty burnt out; I for one think that they'd be looking for prophylactic treatments.