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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This site is a good roundup of various articles and graphs about BCG and COVID-19: https://www.jsatonotes.com/2020/03/if-i-were-north-americaneuropeanaustral.html … One thing it shows is that the low infection rates for young kids may be only because they get the BCG vaccination. In places w/o BCG, younger kids still get it.
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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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