The Journal of Experimental Medicine
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The Journal of Experimental Medicine, Vol 112, 975-981, Copyright, 1960, by The Rockefeller Institute

ARTICLE

BILIRUBIN AND UROBILINS IN GERMFREE, EX-GERMFREE, AND CONVENTIONAL RATS

Bengt E. Gustafsson M.D.1 and Lisa Swenander Lanke M.D.1

1 From the Department of Histology and the Department of Physiological Chemistry, University of Lund, Sweden

No urobilinogens are present in the feces or urine of germfree rats. After contamination of germfree animals with feces from conventional animals the exgermfree rats produced urobilins to the same extent as conventional animals on the same diet. The negative urobilin test turned positive in germfree animals infected with a single Clostridium-like microorganism isolated from the intestinal contents of rats with urobilins in the feces. The output increased in these monoinfected animals after superinfection with a strain of E. coli but never reached the values of conventional animals.

Submitted on July 7, 1960


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