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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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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It's not a virus in the vaccine, it's a bacterium - I guess the possible mechanism for any benefit is to help fight chest infections from related bacteria so that symptoms are reduced. Most children in the UK aren't vaccinated with BCG anymore (I was). https://en.wikipedia.org/wiki/BCG_vaccine …
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