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Overall, the prevalence of OBI was 5.9% (95% confidence interval (CI<jats:sub>95%<\/jats:sub>): 3.8\u20138.7%); it was more frequently associated with \u201canti-HBc alone\u201d serological marker (11.3%; adjusted odds ratio = 3.7, CI<jats:sub>95%<\/jats:sub>: 1.4\u20139.8), although it was also detected in the absence of any HBV serological marker (4.9%; CI<jats:sub>95%<\/jats:sub>: 2.3\u20139.1%). A low prevalence of anti-HCV-positive patients with OBI was found (3.1%; CI<jats:sub>95%<\/jats:sub>: 0.6\u20138.7%). HIV RNA plasma levels or other immunological\/clinical characteristics were not significantly associated with OBI. All but one occult HBV infections were sustained by genotype D viral strains. OBI is relatively frequent in HIV-infected patients, although it does not seem to exert a relevant clinical impact. Viral genotypes in occult HBV infections reflect those circulating in the Mediterranean area.<\/jats:p>","DOI":"10.1155\/2013\/859583","type":"journal-article","created":{"date-parts":[[2013,8,26]],"date-time":"2013-08-26T17:01:20Z","timestamp":1377536480000},"page":"1-7","source":"Crossref","is-referenced-by-count":15,"title":["Prevalence of Occult Hepatitis B Virus Infection in a Cohort of HIV-Positive Patients Resident in Sicily, Italy"],"prefix":"10.1155","volume":"2013","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0108-4608","authenticated-orcid":true,"given":"Fabio","family":"Tramuto","sequence":"first","affiliation":[{"name":"Department of Sciences for the Health Promotion and Mother and Child Care \u201cG. 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