Pyruvate kinase deficiency (PK-def)
Red blood cells break down too soon, so the cat has bouts of anaemia: it is then tired, thin and off its food. It can start anywhere between six months and five years, and some cats never show anything. In a 2012 study about 1 in 6 tested Somalis was a carrier. Testing has made the risk smaller today.
How it is found: DNA test of the parents. A kitten only gets it when both parents are carriers.






