Research overview: feline blood types and their genetics

Cats have a blood group system with important clinical consequences, and this overview surveys feline blood types and their genetic and practical dimensions. It covers the main AB system types A, B and the rare AB, the genetics underlying them, and the marked variation in type frequencies among breeds and geographic populations. The survey explains the clinical importance of blood typing: cats have naturally occurring antibodies against the type they lack, so mismatched transfusions can be fatal, and type-B queens bred to type-A toms can produce neonatal isoerythrolysis, where kittens are harmed by antibodies in the mother's milk. It also notes the more recently recognized Mik antigen. By compiling this knowledge, the survey underscores why blood typing and compatibility testing are essential in feline transfusion medicine and breeding.