The blood type of B negative is also uncommon, occurring in "2% of Caucasian, 1% of African American, 0.4% of Asian and 1% of Latino American" populations, according to the American Red Cross.

The blood type of B negative is also uncommon, occurring in "2% of Caucasian, 1% of African American, 0.4% of Asian and 1% of Latino American" populations, says the Red Cross. Rh-null is the ...

If you don't know your blood type, you're not alone. However it is important medical information to know, and here's how you can find it.

Human populations that left Africa evolved quickly whereas Neanderthals stayed the same, according to an analysis of blood ...

are people with O-negative and B-negative blood. People with Type O are valued as universal donors who can give blood to anybody, while those with a negative RH are especially valuable because they ...