I've been following this correlation for about a week and so far it's holding up that BCG inoculation protects against COVID-19: https://www.medrxiv.org/content/10.1101/2020.03.24.20042937v1 … https://economictimes.indiatimes.com/news/science/us-scientists-link-bcg-vaccination-with-fewer-covid-19-cases-indian-scientists-hopeful-but-cautious/articleshow/74931591.cms … https://www.medicalnewstoday.com/articles/covid-19-could-tb-vaccine-offer-protection … https://www.physiciansweekly.com/explainer-how-an-old/ … This also explains a few other differences:
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One problem with BCG though is it is a live virus TB vaccination, so it's fairly harmless to give younger people, but it can be dangerous for the elderly, or pregnant women. https://www.cdc.gov/tb/publications/factsheets/prevention/bcg.htm … Another problem is the strain of the vaccine seems to matter.
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So, I think in the US they'll use a strain created by a company here, but it looks like only Asian strains of the live virus used seem to work. That means if an N.American or European tries to get it, it probably won't work because it's Asian strains of the virus that work.
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