On the problem of occurrence of infective muscle trichinae in organs devoid of striated muscles

Summary

In order to check the dependability of Hill's finds of muscle trichinae in organs devoid of striated muscle fibres of trichinous swine, 38 pigs, 8 puppies, 14 guinea-pigs and 10 young rabbits were infected with muscle trichinae and their organs investigated for muscle trichinae by: a) the digestive method, and b) the biological method — by infection of rats and puppies.

Examinations after the digestive method of the organs of 12 guinea-pigs from Series I, of 10 pigs from Series II and of 4 puppies from Series V produced negative results, with the exception of several findings of single trichinae in one or another organ of 5 guinea-pigs from Series I, in the urinary bladder of pigs No. 1 from Series II and in the liver of puppy No. 2 from Series V. In our opinion theses single findings in all probability are due of procedural errors: contamination of the organs with muscle trichinae at the opening of the carcasses of the trichinous animals and their extirpation, whereas in the case of the urinary bladder of the male pig No. 1 from Series II — to the circumstance that the area of m, sphincter vesicae and trigonum vesicae had not been separated from the urinary bladder.

As a result of the investigations of the organs of trichinous animals from Series III, IV, V and VI after the biological method by infecting rats and puppies with these organs it has been found that the viscera of trichinous animals, examined after more than a month of their invasion, do not harbour any muscle trichinae.

Muscle trichinae, the number of which corresponds in direct proportion to the muscle trichinae with which the animals were fed, were found in the oesophagus, stomach cardia, m. sphincter ani, the area of m. sphincter vesicae and trigonum vesicae (in male animals), and m. cremaster in their direct examination after the compressor method.

Muscle trichinae were found in the vesica urinaria of the male animals in their direct examination after the compressor method, which may be explained with the presence of striated muscle fibres in the m. sphincter vesicae and trigonum vesicae, which had passed from the m. urethralis. Hill's findings of muscle trichinae in the course of the examination of the urinary bladder of several pigs may be explained with this fact.