Um tipo sanguíneo tão raro que só se conhece uma pessoa no mundo que o tenha.

https://www.scientificamerican.com/article/doctors-discover-new-blood-type-and-only-one-person-has-it/

Doctors Discover New Blood Type—And Only One Person Has It

Newly discovered “Gwada-negative” is the rarest of 48 known blood groups

Scientific American