Fort Yellowstone, Wyoming
April 20, 1908.
Army Medical Museum
I have the honor to report forwarding under separate cover, this date, a well preserved specimen of a common species of caterpillar passed in the stool of a healthy 13 months male child at this station on October 6, 1907.
Interest attaches chiefly to the fact that the worm was so little affected by the processes of digestion in transit, being only slightly decolorized and divested of its coat of hairs. It was flattened and slightly macerated when it appeared in the commode but at once was restored to its normal symmetry upon placing it in the alcohol preservative.
This is the second worm passed by the child, the first having been passed on October 5 but thrown away by the mother after exciting momentary curiosity. Upon passing the second the mother brought it to me for examination and advice.
The only noticeable effect upon the health of the child was a slight diarrhea and sufficient digestive disturbance to cause disinclination for food during the time the larvae were in the digestive tract, there being a speedy and permanent return to normal conditions following expulsion of worms.
Assistant Surgeon, U.S. Army