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a coproantigen diagnostic test for strongyloides infectioncoproantigen诊断测试类圆线虫属感染
A Coproantigen Diagnostic Test for Strongyloides Infection Alex M. Sykes, James S. McCarthy* Clinical Tropical Medicine Laboratory, Queensland Institute of Medical Research, University of Queensland, Herston, Australia Abstract Accurate diagnosis of infection with the parasite Strongyloides stercoralis is hampered by the low concentration of larvae in stool, rendering parasitological diagnosis insensitive. Even if the more sensitive agar plate culture method is used repeated stool sampling is necessary to achieve satisfactory sensitivity. In this manuscript we describe the development of a coproantigen ELISA for diagnosis of infection. Polyclonal rabbit antiserum was raised against Strongyloides ratti excretory/ secretory (E/S) antigen and utilized to develop an antigen capture ELISA. The assay enabled detection of subpatent rodent S. ratti and human S. stercoralis infection. No cross-reactivity was observed with purified E/S from Schistosoma japonicum, the hookworms Ancylostoma caninum, A. ceylanicum, nor with fecal samples collected from rodents harboring Trichuris muris or S. mansoni infection. Strongyloides coproantigens that appear stable when frozen as formalin-extracted fecal supernatants stored at 220uC remained positive up to 270 days of storage, whereas supernatants stored at 4uC tested negative. These results indicate that diagnosis of human strongyloidiasis by detection of coproantigen is an approach worthy of further development. Citation: Sykes AM, McCarthy JS (2011) A Coproantigen Diagnostic Test for Strongyloides Infection. PLoS Negl Trop Dis 5(2): e955. doi:10.1371/journal.pntd.0000955 ´ E
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