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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Parasite-specific IgG response and peripheral blood eosinophil count following albendazole treatment for presumed chronic strongyloidiasis.
Journal of Travel Medicine 2006 March
BACKGROUND: In developed countries, asymptomatic chronic Strongyloides stercoralis infection occurs in immigrants from endemic regions of the world. Accurate and reliable means of diagnosis and follow-up are required for effective management. The role of S stercoralis enzyme-linked immunosorbent assay (ELISA) in this context was examined.
METHODS: In this study, 95 asymptomatic Laotian immigrants living in Melbourne, Australia, for an average of 12 years, were screened for S stercoralis infection using stool microscopy, eosinophil count, and serology by ELISA. Twenty-two patients with a positive ELISA were treated with albendazole, 400 mg twice daily for 3 days, and monitored with serology, fecal microscopy, and eosinophil counts at 2, 6, 12, and 36 months after treatment.
RESULTS: Patients with moderately reactive baseline ELISA and no eosinophilia had no significant change in either measure over the 36 months of follow-up. All patients with a strongly reactive baseline ELISA showed a reduction in reactivity over the first 6 months of treatment. However, in 50% of these patients, reactivity increased between 12 and 36 months, suggesting treatment failure and relapse of infection. One patient had confirmed treatment failure based on the development of hyperinfection syndrome.
CONCLUSION: The results support evidence that serology is a valuable tool in monitoring treatment responses in patients with suspected strongyloidiasis and highlights the need to ensure that S stercoralis is completely eradicated after treatment.
METHODS: In this study, 95 asymptomatic Laotian immigrants living in Melbourne, Australia, for an average of 12 years, were screened for S stercoralis infection using stool microscopy, eosinophil count, and serology by ELISA. Twenty-two patients with a positive ELISA were treated with albendazole, 400 mg twice daily for 3 days, and monitored with serology, fecal microscopy, and eosinophil counts at 2, 6, 12, and 36 months after treatment.
RESULTS: Patients with moderately reactive baseline ELISA and no eosinophilia had no significant change in either measure over the 36 months of follow-up. All patients with a strongly reactive baseline ELISA showed a reduction in reactivity over the first 6 months of treatment. However, in 50% of these patients, reactivity increased between 12 and 36 months, suggesting treatment failure and relapse of infection. One patient had confirmed treatment failure based on the development of hyperinfection syndrome.
CONCLUSION: The results support evidence that serology is a valuable tool in monitoring treatment responses in patients with suspected strongyloidiasis and highlights the need to ensure that S stercoralis is completely eradicated after treatment.
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