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Genotypic characterization of human immunodeficiency virus type 1 in Greece. Multicentre Study on HIV-1 Heterogeneity.

The HIV-1 subtype distribution in 83 HIV-1-seropositive individuals living in Greece was investigated by using the heteroduplex mobility assay (HMA), DNA sequencing, and phylogenetic analysis. The results revealed that partial HIV-1 gp120 sequences from 71 (86%) patients were subtype B, 5 (6%) were subtype A, 4 were subtype D (5%), 2 (2%) were subtype C, and 1 (1%) was subtype I. The subtype I isolate was documented in an intravenous drug user. A high prevalence (90-100%) of B isolates among intravenous drug users, hemophiliacs, and homosexual men was observed, in contrast to heterosexuals, among whom non-B subtypes seemed to be common (42.9%, p < 0.001). Among the Greek population subtype B is the most frequent (94%), in contrast to the high prevalence (57%) of non-B isolates found in emigrants living in Greece (p < 0.001). A heterosexual transmission case of subtype D in a Greek individual not traveling abroad was also documented. The broad HIV-1 diversity in Greece may be explained by population movements, such as migration and traveling.