Your link refers to the following clinical trials for BCG, running since March: https://clinicaltrials.gov/ct2/show/NCT04327206 https://clinicaltrials.gov/ct2/

Your link refers to the following clinical trials for BCG, running since March: https://clinicaltrials.gov/ct2/show/NCT04327206 https://clinicaltrials.gov/ct2/show/NCT04327206 https://clinicaltrials.gov/ct2/show/NCT04328441 https://clinicaltrials.gov/ct2/show/NCT04328441 It seems there are no current clinical trials for OPV, just that author arguing that such trial could be started (first time in April). BTW, looking at how polio manifested, it really is a good example about what viruses are able to do, and why only counting "dead" (as in CFR or whatever) misses the point: https://www.cbc.ca/news/canada/manitoba/covid-19-is-threatening-to-us-past-epidemic-leaves-survivors-at-risk-1.5510947 https://www.cbc.ca/news/canada/manitoba/covid-19-is-threaten... "Polio often destroyed nerve cells that controlled muscles, leaving some with paralyzed limbs or lungs."