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The frequency of the Rh-negative phenotype differs significantly between populations. In Africa and Asia the Rh-negative phenotype is less common. For example, there are reports of a 6% rate of Rh-negatives in Nigeria [24] and only 1% in Madagascar [25]. In various regions of India Rh negativity was found to be 0.68.4% [26]. In South East Asia and Far East the D-negative phenotype is even rarer. In China [27, 28], Indonesia [29], and Japan [18] less than 1% of the population is Rh-negative.
On the other hand, Western nations like Britain [30] and United States [31] have Rh factor negativity of 17 and 15%, respectively, which are closer to the findings of this study. A study in one region of Saudi Arabia revealed that 29% of the population was Rh negative [32]. Rh-negative frequencies of about 29% were documented among Basques and in distinct populations living in the High Atlas Range of Morocco [25], which have the highest reported prevalence of Rh-negative phenotypes apart from that from Saudi Arabia above.
The higher frequency of group O than non-O phenotypes among the Nilotic natives in this study agrees with the hypothesis that in malaria endemic areas type O is dominant. The Nilotic people are natives to the study area which is among the highest year-round malaria transmission areas in Ethiopia. It appears that the natives with blood type O better survived severe malaria. On the other hand, both Rh-negative and O phenotypes might have encouraged malaria transmission in the area as asymptomatic carriers prevailed probably because of their resistance to malarial disease showing the beneficial effects of the phenotypes.
As aforementioned, in Africa Rh negativity is very low (13%) with the exception of the Yorubas, Chad or Cameroon areas [29]. Previous reports for Ethiopia showed that the Rh negativity in the country to be three times that of the continental average.
The current data calls for routine screening of pregnant women to avoid the potential risk of erythroblastosis fetalis in the study area. In fact both women and men are required to be tested before having a child. But this is rarely practiced in Ethiopia and the current finding would be helpful in creating awareness. Moreover, since Rh-negative blood group is rare in many populations it is scarcely available in blood banks. The finding shows that Rh-negative group is more common than expected among certain groups and such individuals may be approached, encouraged and convinced to donate blood to make this blood group more available in blood banks for the needy and better save life. Table 1 Distribution (%) by population group of ABO and Rh(D) phenotypes in Gambella hospital, southwestern Ethiopia
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He is trapped in a time warp. Can't get out the 1800's. SMH. Blood groups??!! This guy is probably in his 80s'. Wouldn't let go of this archaic mid 1800's thinking about bones and blood groups. All of which has been debunked.
-------------------- Without data you are just another person with an opinion - Deming Posts: 12143 | From: When you have eliminated the impossible, whatever remains, however improbable | Registered: Jun 2007
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Rhesus factor is low in all ethnic groups but lowest in Asians.
what a dumbass.
-------------------- Without data you are just another person with an opinion - Deming Posts: 12143 | From: When you have eliminated the impossible, whatever remains, however improbable | Registered: Jun 2007
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The highest percentage is found among some of the tribes still living in the Atlas Mountains of Morocco (40%)
The next highest are the Basques, ( isolated tribe of Spain) reported in different publications as having 25 and 32%, depending on location. The people of northwest Ireland, the Highland Scots and the western islanders of Norway all have between 16 and 25%, while the Lapps of Norway and Finland have between 5 and 7%. In addition, Cavalli-Sforza reports two small isolated populations of the same tribe, one in Chad and another in Senegal, each with about 25%. On his map, he shows an Rh-negative population in Chad, still living near the formerly enormous Chad lake. Only part of this lake still exists on the spot where the boundaries of Chad, Niger, Nigeria and Cameroon meet. These people may originally have been the sailors on Chad lake. Could it be that this is the original location of the Rh-negative population that then moved to Morocco and Algiers to become the Berbers? Or would it be the other way around?
Yorubans have high RH compared to the rest of West Soudan Black Africans. Bedouin up 18 to 30% RH negative
I am a black woman and not 80. I inherited O RH negative from my mother who had minimal caucasian admixture and always wondered about it since I had to receive the protective shots during both of my pregnancies.
Posts: 165 | From: Miami Beach, Florida | Registered: Jun 2017
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Ok. I will make it simple......blood groups as a means of "racial" categorization" or admixture is grossly outdated. It is 18ht century science.
-------------------- Without data you are just another person with an opinion - Deming Posts: 12143 | From: When you have eliminated the impossible, whatever remains, however improbable | Registered: Jun 2007
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