[Al Simmons]

"The blood type on the Shroud and Sudarium also matches the blood type from the Eucharistic miracle at Lanciano."

Link please ;-)

[Nihil Obstat]

Here is one link. I remember reading recently about scientist who did a thorough investigation. The more you know about it the more amazing it is.

http://www.therealpresence.org/eucharst/mir/lanciano.html

And of course, there is a Eucharistic miracle at every mass, it's just that some are more visible than others.