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Skeptasmic's avatar

None of the Buenos Aires specimens were tested for blood type. Lanciano was never tested for Rh factor (+/-) but Tixtla tested AB-. The likelihood of false positives varies by the type of test, but essentially the reason a particularly dirty specimen is likely to test AB is the same reason al large American High School is likely to have both a John and a Matt. Contaminants that will test A and contaminants that will test B are common enough that if you get a whole ton of different contaminants together it's likely you'll wind up with both.

Are you aware that the image you used is from a claimed Eucharistic Miracle of Julia Kim? The Archbishop has said that "The faithful are reminded that these false teachings and associated devotional material should not be promoted or distributed"

https://chancery.catholic.sg/wp-content/uploads/sites/13/2025/10/Chancery-Notice-CHN-CN-2025-026.pdf

redbert's avatar

>Also based on my limited research, this doesn’t seem to be a case of systematic classification bias. It’s not as if type AB is particularly more likely to appear in false positive human blood tests compared to other types. Skeptics of the eucharistic miracles point to possible bacterial or antigen explanations as opposed to human blood. Whether that is the case is debateable; however, this does not explain why all the tests from the substances across times and places end up resolving specifically to type AB.

yes it absolutely does

why is the church not sequencing dna?

Eric Beckmann's avatar

Bacteria or antigens don't explain why the blood type is AB, because bacterial or antigens can arbitrarily test as any blood type (O, A, B, or AB). All three eucharistic miracles listed here happened at different times in places, so there is no reason to postulate that the exact same bacteria / antigens were present at all of them and causing the same blood type results (if bacteria / antigens are even the true cause). In other words, even if all three eucharistic miracles are bacteria / antigens, it would still require some "luck" that all would also happen to test as type AB.

I think Tixtla and Buenos Aires DID undergo DNA testing, but the samples were too degraded to get meaningful results. The testing in Lanciano was done in the 1970s before modern DNA testing was available, and no testing has been authorized since (presumably to avoid destructively sampling the relic).

redbert's avatar

wrong

look up convergence in serology

come back for more

don't bring excuses 🦓

Eric Beckmann's avatar

If I understand correctly, all three of these cases had multiple serological tests conducted. The results did converge as positive for human tissue, but a specific DNA profile couldn't be determined.

redbert's avatar

inconclusive at best

but I'm not catholic so my experience is a little different