Prevalence of group O, group A, and non–group O in regions of current or previous malaria19,,–22
| Country/people . | Group O, % . | Group A, % . | Non–group O, % . | Ratio O to A . | Malaria area, current or past . |
|---|---|---|---|---|---|
| Southeast Nigeria | 87 | 8 | 13 | 11.0 | Yes |
| Sudan | 62 | 16 | 38 | 3.86 | Yes |
| Kenya/Kikuyu | 60 | 19 | 40 | 3.16 | Yes |
| African Bushmen | 56 | 34 | 44 | 1.65 | Yes |
| Central African Republic | 44 | 28 | 56 | 1.57 | Yes |
| Congo | 52 | 24 | 48 | 2.17 | Yes |
| Eritrea/Somalia | 60 | 22 | 40 | 2.73 | Yes |
| Ghana | 47 | 23 | 53 | 2.04 | Yes |
| Namibia | 47 | 10 | 53 | 4.70 | Yes |
| Central America; Amazon basin | 90 | < 10 | 10 | > 9 | Yes |
| North American Indians/Navajo | 73 | 27 | 27 | 2.70 | Yes |
| USA, general/Indians | 79 | 16 | 21 | 4.94 | Yes |
| Persia | 38 | 33 | 62 | 1.15 | Yes |
| Turkey | 43 | 34 | 57 | 1.26 | Yes |
| Philippines | 45 | 22 | 55 | 2.04 | Yes |
| Vietnam | 42 | 22 | 58 | 1.91 | Yes |
| Papua New Guinea | 41 | 27 | 59 | 1.52 | Yes |
| Finland | 34 | 41 | 66 | .83 | No |
| Austria & Hungary | 36 | 44 | 64 | .82 | No |
| Sweden | 38 | 47 | 62 | .81 | No |
| Switzerland | 40 | 50 | 60 | .80 | No |
| Norway | 39 | 50 | 61 | .78 | No |
| Bulgaria | 32 | 44 | 68 | .73 | No |
| Czech Republic | 30 | 44 | 70 | .68 | No |
| Portugal | 35 | 53 | 65 | .66 | No |
| Country/people . | Group O, % . | Group A, % . | Non–group O, % . | Ratio O to A . | Malaria area, current or past . |
|---|---|---|---|---|---|
| Southeast Nigeria | 87 | 8 | 13 | 11.0 | Yes |
| Sudan | 62 | 16 | 38 | 3.86 | Yes |
| Kenya/Kikuyu | 60 | 19 | 40 | 3.16 | Yes |
| African Bushmen | 56 | 34 | 44 | 1.65 | Yes |
| Central African Republic | 44 | 28 | 56 | 1.57 | Yes |
| Congo | 52 | 24 | 48 | 2.17 | Yes |
| Eritrea/Somalia | 60 | 22 | 40 | 2.73 | Yes |
| Ghana | 47 | 23 | 53 | 2.04 | Yes |
| Namibia | 47 | 10 | 53 | 4.70 | Yes |
| Central America; Amazon basin | 90 | < 10 | 10 | > 9 | Yes |
| North American Indians/Navajo | 73 | 27 | 27 | 2.70 | Yes |
| USA, general/Indians | 79 | 16 | 21 | 4.94 | Yes |
| Persia | 38 | 33 | 62 | 1.15 | Yes |
| Turkey | 43 | 34 | 57 | 1.26 | Yes |
| Philippines | 45 | 22 | 55 | 2.04 | Yes |
| Vietnam | 42 | 22 | 58 | 1.91 | Yes |
| Papua New Guinea | 41 | 27 | 59 | 1.52 | Yes |
| Finland | 34 | 41 | 66 | .83 | No |
| Austria & Hungary | 36 | 44 | 64 | .82 | No |
| Sweden | 38 | 47 | 62 | .81 | No |
| Switzerland | 40 | 50 | 60 | .80 | No |
| Norway | 39 | 50 | 61 | .78 | No |
| Bulgaria | 32 | 44 | 68 | .73 | No |
| Czech Republic | 30 | 44 | 70 | .68 | No |
| Portugal | 35 | 53 | 65 | .66 | No |