From FB group for O Negatives:
http://www.facebook.com/group.php?gid=21303229657
The goal of this group pretend to be a place to all people who share the O-negative blood type, so that any person in need can quickly find geographically closest person to be transfused with blood that is safe for him or her, in case an emergency or accident.
It is know the most common blood type is O positive (O+) and the rarest is AB negative (AB-), but just the 6.6% of the world population has O negative (O-) and 0.6% of the population has AB negative (AB-). However, AB- is compatible with O-, A-, and AB- while O- is only compatible with the same blood type.
Additionally, only 7% of the people in the world have the RH negative (-) factor. If you are a woman with RH-, you should become an active member of this group.
There are some shocking characteristics of the people with this genetic code. Nearly 85% of all human beings have RH positive blood. Their red blood cells contain a substance called the RHesus blood factor. This means the positive blood contains a protein that can be traced to the Rhesus monkey. It is acknowledged that blood factors are transmitted with more exactitude than any other human or animal characteristic. While it is known that RH negative blood - (type 'O') is the purest blood known to mankind, it is not known from where the negative factor originates, RH negative factor that makes the blood 'pure'. Pure enough to be the universal blood of the world.
Everyone on the face of the earth can receive RH negative type 'O' blood, but these very same 'O' negative people cannot receive blood from any other type except their own type. An RH negative pregnant mother's body will reject her positive blooded baby in the womb. Her body fights the RHesus factor as a foreign element. A positive mother's body does not fight the negative baby she is carrying however.
Science at this very time is attempting to make the recipe for RH negative 'O' blood, but without success. The protein in positive blood can be cloned, but not so of the negative blood - which is quite interesting. If the RH negative factor does not derive from any known earthly link - from where did it originate? Just for think...
One last recommendation, if you are RH negative (RH-), you should strongly consider becoming a blood donor. Whenever an RH negative patient needs blood, it's harder to find compatible blood for him because there are fewer RH negative donors than RH positive donors. RH negative patients can receive only RH negative blood, but RH positive patients can receive either RH positive or RH negative blood.