It is considered somewhat rare. Only 7% of the population is O Negative. Approximately 20% of the population is CMV negative. So only about 1.4% of the population is O Negative CMV negative. That is fewer than 2 our of ever 100 people. It isn't the rarest, but it is a very useful type.
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O negative CMV negative blood is less common compared to O positive CMV negative blood. The presence of CMV antibodies in blood is more prevalent in the general population, so finding CMV negative blood can be a challenge. However, blood banks do maintain stocks of O negative CMV negative blood for transfusion in certain situations.
Having O positive blood with an Rh(Kell) negative blood type is relatively rare. The O positive blood type is the most common blood type, but the combination of O positive with Kell negative is less common. It is important to discuss any concerns with your healthcare provider regarding blood compatibility for any future medical needs.
If both parents are O negative, their child will also be O negative. This is because O negative is a recessive blood type that requires both parents to contribute an O negative allele for the child to have O negative blood type.
For two parents to have a child with type O negative blood group, both parents must have at least one O and one negative Rh factor allele. The possible parental blood group combinations could be O negative x O negative, O negative x O positive, A negative x O negative, or B negative x O negative.
Yes, a person with O negative blood can donate blood to a person with Rh negative blood. O negative is considered a universal blood type that can be given to individuals of any blood type, including Rh negative individuals.
People with O negative blood are often referred to as "universal donors" because their blood can be transfused to patients with any blood type. Therefore, anyone can donate O negative blood to individuals in need, regardless of their own blood type.