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An epidemiological study was carried out in 2004-2005 at the anti-tuberculosis centre of Divo (Ivory Coast) to collect sera from patients who consulted for tuberculosis suspicion and to estimate the seroprevalence of human paragonimosis in the context of a systematic screening. No Paragonimus egg was found in the stools and/or sputa of the 167 persons investigated. In contrast, 41 sera were ascertained with antibodies against Paragonimus africanus using ELISA testing. As the optical density (OD) values related to seropositive findings were found under 0.6 (the minimal OD to detect an active paragonimosis), the above antibody titres might originate from patients in chronic or in convalescent stages, or might result of cross reactions with trematodes. Concomitantly, dissection of local crabs (Callinectes marginatus) demonstrated the presence of Paragonimus metacercariae in six out of 34 examined. The parasite burdens in crabs ranged from two to 35 cysts with a mean diameter of 302 microm. In Ivory Coast, the locality of Divo must be considered an at-risk zone in reason of the presence of anti-Paragonimus antibodies in several human sera and the presence of infected crabs at the local market.

First findings on the seroepidemiology of human paragonimosis at the anti-tuberculosis centre of Divo, Republic of Ivory Coast (West Africa)