Serosurvey of anti-Toxoplasma gondii antibodies in homeless persons of São Paulo city, southeastern Brazil

Laís Giuliani FelipettoAlexander Weilker Biondo


Background: Seroprevalence of Toxoplasma gondii has been extensively studied in a variety of vulnerable populations. However, no study has focused on homeless populations. Accordingly, the present study aimed to assess the seroprevalence of anti-T. gondii antibodies and the risk factors associated in homeless persons from homeless shelter of São Paulo city, southeastern Brazil. In addition, anti-HIV antibodies and associated risk of T. gondii and HIV coinfection have been evaluated.Methods: Anti-T. gondii antibodies were detected by indirect fluorescent antibody test. In addition, anti-HIV levels were testedby chemiluminescence enzyme immunoassay, with positive samples confirmed by rapid immunoblot assay.Results: Overall, IgG anti-T. gondii seropositivity was found in 43/120 (35.8%) homeless persons, with endpoint titers varying from 16 to 1,024. The only two pregnant womentested were negative for IgM by chemiluminescence enzyme immunoassay, with normal parturition and clinically healthy newborns in both cases. There were no statistical differences in the risk factors for anti-T. gondii serology (p>0.05). Anti-HIV seropositivity was found in 2/120 (1.7%) homeless persons, confirmed as HIV-1. One HIV seropositive individual w...Continue Reading

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