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The life history of the encysted stomach worm is not known in detail, but it is undoubtedly very much the same as that of the twisted stomach worm.

The life histories of the various small roundworms occurring in the intestines of cattle, so far as they have been worked out, are very similar to that of the twisted stomach worm as described on page 519.

The same measures as recommended above for preventing infection with the twisted stomach worm should be used.

The symptoms caused by this parasite are very similar to those produced by the twisted stomach worm.

Embryo of twisted stomach worm H�monchus contortus coiled on tip of grass blade 521 16.