Epidemiology and Infection

Original Papers

Viruses

Heterogeneity and penetration of HIV-1 non-subtype B viruses in an Italian province: public health implications

C. TORTIa1 c1, G. LAPADULAa2, I. IZZOa1, G. BRINDICCIa3, G. LABBATEa4, E. QUIROS-ROLDANa1, I. DIALLOa1, F. GARGIULOa4, F. CASTELNUOVOa5, A. CALABRESIa1, G. CAROSIa1, N. MANCAa4 and L. MONNOa3

a1 Institute of Infectious and Tropical Disease, University of Brescia, Brescia, Italy

a2 Clinic of Infectious Diseases, S. Gerardo Hospital, Monza, Italy

a3 Institute of Infectious Diseases, University of Bari, Bari, Italy

a4 Institute of Microbiology, University of Brescia, Brescia, Italy

a5 Infectious Disease Department, Spedali Civili, Brescia, Italy

SUMMARY

This study assessed changes in prevalence and distribution of HIV-1 non-subtype B viruses in Italian and immigrant patients over two decades in a province in Italy. All HIV-positive patients who underwent genotypic resistance testing were selected. Prevalence of non-subtype B viruses in 3-year periods was calculated. All sequences of non-subtype B and those provided by REGA as unassigned were analysed for phylogenetic relationships. In total, 250/1563 (16%) individuals were infected with a non-subtype B virus. Prevalence increased over time, reaching a peak (31·5%) in 2004–2006. In Italian patients, the most frequent subtypes were B (92·5%) and F1 (4%). F1 subtype was also prevalent in patients from South America (13·6%); in patients of African origin, CRF02_AG (54·9%) and G (12·3%) were the most frequent. HIV-1 non-subtype B infections in Italians were mostly found in patients who acquired HIV sexually. A phylogenetic relationship between F subtypes in Italian and representative HIV-1 sequences from Brazil was found. C subtypes in Italians were phylogenetically related to subtypes circulating in Brazil. Inter-subtype recombinants were also found in the latest years. The HIV-1 epidemic in Brescia province evolved to the point where about 1/3 patients recently diagnosed harboured non-B HIV subtypes. The distribution of HIV-1 non-B subtypes in Italian patients resembled that in South American patients and phylogenetic relatedness between some Italian and South American HIV-1 strains was found. The possible epidemiological link between these two populations would have been missed by looking only at risk factors for HIV acquisition declared by patients. The evidence of inter-subtype recombinants points to significant genetic assortment. Overall our results support phylogenetic analysis as a tool for epidemiological investigation in order to guide targeted prevention strategies.

(Accepted December 16 2009)

(Online publication January 29 2010)

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