[katex]

Yes, sorry .. wasn't quite clear. The most common blood groups are the ones most needed due to the fact most people with these groups will be drawing off the banks. It's for bone marrow transplant, not blood transfusions .. harder to match, but the blood group is the first hurdle.

A suitable match has not been found and the extra problem is that she is of Afro-Caribbean heritage, and seemingly caucasian bone marrow very rarely matches blacks. I think purely due to the fact that ethnic groups are not easily persuaded to donate, and they are likely to have more rare genetic make-ups because their genes are more racially mixed.

Just trying to get people to donate generally is a good starter.