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Songok, E.M. et al.

Serological investigation of HIV-1 variant subtype strains in transmission in Nairobi.

In a bid to determine the HIV-1 subtype variants in transmission in Nairobi and its possible association with clinical status, we screened 207 confirmed HIV-1 positive patients visiting HIV/AIDS laboratory at the Virus Research Centre in Nairobi between January and March 1994. We used a selfmade ELISA obtained from an established panel of HIV-1 V3 loop peptides (ANRS, France) and derived from seven isolates: MN, HXB2, SC, Z6, Z2, ELI and CDC4. Test samples were obtained from 95 blood donors and medical examination attendees, 57 patients with chronic diarrhoea, 31 confirmed pulmonary tuberculosis, 16 with pneumonia and 12 herpes zoster. Out of the total, 21.5% had antibodies against the MN strain, 19.1% had against the Z2 strain while reaction against the HXB2 strain was observed in 17.2%. SC, CDC4, Z6 and ELI had prevalences of 11.5%, 6.2%, 5.3% and 3.8% respectively. Fifteen per cent of the tested sera showed no reaction to any of the used peptides. Strong and significant associations were observed between the total number of strains a sample react to and the clinical state. We infer that both the North American consensus strains (MN and HXB2) and the African isolates (Z2 and Z6) are predominant in Nairobi. The correlation between antibody reactivity and clinical state is an interesting observation that necessitates an expanded study and, the use of strain specific peptides maybe a sensitive and easier method for use for molecular epidemiological purposes.[1]

References

Serological investigation of HIV-1 variant subtype strains in transmission in Nairobi. Songok, E.M., Tukei, P.M., Mulaa, F.J. East African medical journal. (1996) [Pubmed]

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