Experimental concurrent infections with Strongyloides ratti and S. venezuelensis in laboratory rats

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Abstract
The distribution of S. ratti and S. venezuelensis in the intestine of albino rats was studied in experiments with single species infections and in mixed infections.The majority of S. ratti were found in the anterior 20 cm of the intestine and in decreasing numbers in the remaining 60 cm. The larvae of S. ratti settled in the Lieberkühn crypts where they matured and laid eggs in convoluted tubes.The parasitic females of S. venezuelensis were concentrated in the anterior 15 cm of the intestine, with over 50 % in the anterior 5 cm, and a few worms 20–25 cm posterior to the pylorus. The larvae settled in the villi, close to the surface of the mucosa. The straight egg strands were laid on this site.It was concluded that, although occurring together, the two species can coexist in the intestine without interfering with each other.

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