The two previously known strains of HIV are known as HIV-1 and HIV-2. These are similar in structure, but differ in their serological properties. Both are divided into subtypes, which have large differences in the geographical distribution.
of HIV-1 there are two (2) subgroups (occurs mainly in Cameroon and the U.S.) with M and O are known. The group M is further divided into nine (9) subtypes, labeled A (especially in Central and Eastern Africa and Europe), B (especially in Europe, Central Africa, North America, South America, India and Indochina), C (Central and Southern Africa, Europe, India and Indochina), D (Central Africa and Europe), E (Central, Eastern and Southern Africa, Europe, India and Indochina), F (Central Africa, South America and Europe), G (Central and West Africa and Europe), H (Central Africa and Europe) and I (known in the Middle East). The less pathogenic HIV-2 is divided into five (5) sub-groups, with A (worldwide), B (particularly in West Africa, Europe and India), C (West Africa), D (West Africa) and are called E (West Africa).
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