The Eucharistic Miracle of Buenos Aires

A consecrated host that, in 1996, reportedly turned to bleeding heart tissue, investigated under then-Archbishop Jorge Bergoglio.

The Buenos Aires case is a modern reported Eucharistic miracle, often discussed alongside Lanciano because of the claimed similarity of the tissue analyzed. It is also notable because the bishop who oversaw its investigation, Jorge Mario Bergoglio, later became Pope Francis.

What happened

On August 18, 1996, in the parish of Santa Maria in the Almagro district of Buenos Aires, a consecrated host was found discarded on a candleholder at the back of the church. Following the custom for a host that cannot be consumed, the priest placed it in water to dissolve and set it in the tabernacle. Days later, rather than dissolving, it was reported to have turned into a bloody, fleshy substance. The then-auxiliary bishop (soon archbishop) Jorge Mario Bergoglio had the sample photographed and kept under preservation, and allowed several years to pass before any analysis, so as to avoid haste.

The scientific findings

Beginning in 1999 the preserved sample was submitted for study, coordinated by Dr. Ricardo Castanon Gomez, and a fragment was eventually examined by Dr. Frederick Zugibe, a forensic pathologist at Columbia University. The analysts worked without being told the sample's origin. The reported findings were:

• The sample is human myocardium, muscle from the wall of the left ventricle of a heart, the chamber that pumps blood to the body.
• The tissue showed signs of inflammation, with intact white blood cells present within it, features ordinarily seen only in living tissue that was under stress at the time of sampling.
• The blood type was reported as AB, the same type reported for the Lanciano relic and for the Shroud of Turin.

Commentators have noted the reported resemblance to the Lanciano relic. It is worth being clear about what such analysis can and cannot settle. A laboratory can describe what the sample is and compare it with the Lanciano relic; it cannot reproduce the alleged event, because a miracle is a singular act of God, not a repeatable experiment. The questions science can genuinely weigh are narrower: whether the sample is what it is claimed to be and whether the testing was competent and honestly reported. On those points the results remain debated. They are offered here as what the examiners reported, which a believer may rightly weigh as a sign.

How the Church regards it

The case has not received a definitive formal declaration and is best described as reported and studied rather than officially approved. That the investigation was overseen by the future Pope Francis has drawn it wide attention, but episcopal interest is not the same as a formal verdict. The Church counsels prudence with alleged miracles and does not oblige belief in them.

Why it matters

Like Lanciano, the account is presented as a sign pointing to the doctrine of the Real Presence, offered for the strengthening of faith rather than as its foundation. Its interest lies partly in its modernity: a reported case from the age of forensic pathology, which believers weigh and skeptics contest with the tools of the present day.