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Strongyloidiasis is a parasitosis characterized by persistent infection before dissemination and the development of potentially fatal disease. Since diagnosis is difficult, knowledge of the prevalence and geographic distribution of the disease is of practical importance. A study was made of Strongyloides stercoralis infection in a random and representative sample of farm workers in a tourist region in Spain based on the detection of larvae of triple stool samples. The prevalence of infection was 12.4% (95% confidence interval [CI] = 8.416.4). None of the 26 clinical or epidemiologic variables analyzed were found to be predictive of infection. Only eosinophilia (> 400 eosinophils/mm3) was significantly greater among the infected individuals (odds ratio = 73.4, 95% CI = 16.3327.0), with a sensitivity of 93.5% and a specificity of 93.1%. A screening program is proposed to detect eosinophilia, to provide treatment without stool examinations, and thus afford a cost-effective policy for preventing the development of severe forms of the disease among specific risk groups where the prevalence of other parasitoses is low.
Received February 24, 2003. Accepted for publication July 1, 2003.
Acknowledgments: We thank Santiago Pérez (Escuela Valenciana de Estudios en Salud Pública) and M. Luisa Rebagliato (Universidad de Alicante) for contributions to the statistical analysis and for reviewing the article.
Financial support: This study was supported by the Institución Valenciana de Estudios e Investigación.
Authors addresses: P. Román-Sánchez, Servicio de Medicina Interna, Hospital General de Requena, Paraje Casablanca s/n, 46340 Requena, Valencia, Spain, Telephone: 34-96-233-9674, Fax: 34-96-233-9672, E-mail: gilroman{at}terra.es. A. Pastor-Guzmán, R. Igual-Adell, S. Suñer-Generoso, and C. Tornero-Estebánez, Hospital Francesc de Borja, Paseo Germanías 76, 46700 Gandia, Valencia, Spain, Fax: 34-96-287-5936. S. Moreno-Guillén, Hospital Ramón y Cajal, Carretera Colmenar Km 9-100, 28034 Madrid, Spain, Fax: 34-91-358-0614.
Reprint requests: P. Román-Sánchez, C/ Elche 31, La Eliana, 46183 Valencia, Spain.
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