I had no idea there are 43 different blood types! From Horowhenua Chronicle, 24 Jun 2022.

most people are aware of the four main blood groups, A, B, AB and O…blood can be divided into …43 recognised types… A very rare type called Jk3… is found in … Māori and Pasifika donors.

Screenshot from article mentioning 43 different blood types.
Miraz Jordan @Miraz