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Italian Journal of Dermatology and Venereology 2021 Jul 20

DOI: 10.23736/S2784-8671.21.07042-0

Copyright © 2021 EDIZIONI MINERVA MEDICA

language: English

HIV and syphilis: incidence rate of co-infection and syphilis re-infection in a cohort of newly diagnosed HIV patients

Francesca DI TULLIO 1, Victor D. MANDEL 1, 2 , Gianluca CUOMO 3, Maurizio COPPINI 1, Giovanni GUARALDI 4, Cristina MUSSINI 4, Giovanni PELLACANI 1, Vanni BORGHI 3

1 Dermatology Unit, Surgical, Medical and Dental Department of Morphological Sciences related to Transplant, Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy; 2 Dermatology Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy; 3 Clinic of Infectious Diseases, Azienda Ospedaliero-Universitaria Policlinico, Modena, Italy; 4 Clinic of Infectious Diseases, University of Modena and Reggio Emilia, Modena, Italy


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BACKGROUND: Syphilis represents a major public health concern disproportionately affecting HIV positive patients and in many cases both infections are newly diagnosed at the same time. To date, limited studies are available on syphilis incidence in patients with a new HIV diagnosis.
METHODS: Patients newly diagnosed with HIV in 2010-2018 were included in the study and screening tests for syphilis were performed at baseline and at least once a year. Primary aims were to analyse the incidence rate of HIV-syphilis co-infection and syphilis re-infection. Secondary objective was to identify characteristics independently associated with co-infection and re-infection.
RESULTS: Of 500 newly diagnosed HIV patients, 20% presented a concomitant positive syphilis serology. Among them, 54 patients had a serology indicative for an active syphilis requiring therapy, while 46 had a history of prior treatments. The independent factors for syphilis acquisition were: MSM contact (OR:2.64; 95%CI 1.48-4.72; p<0.001), male gender (OR:2.43; 95%CI 1.08-5.48; p=0.032), and age (OR:1.03; 95%CI 1.01-1.05; p=0.005 per year increasing). Presence of syphilis at the time of HIV diagnosis remained fairly stable during the study period (P for trend, p=0.689). We observed 52 syphilis re-infections related to 37 people. Patients with at least one re-infection were all males and 86.5% MSM.
CONCLUSIONS: Males and MSM with HIV presented high rates of syphilis co-infection and re-infection suggesting persistent high-risk sexual behaviours and the need for appropriate intervention strategies in order to early detect and treat syphilis avoiding life-threatening complications and the spread of the infection in the community.


KEY WORDS: HIV; AIDS; Syphilis; Sexual behavior; Homosexual

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