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The prevalence of moniliformis dubius acanthocephala among house rats and cockroaches in osaka japan and the morphological observation of the worm


Japanese Journal of Parasitology 34(5): 377-388
The prevalence of moniliformis dubius acanthocephala among house rats and cockroaches in osaka japan and the morphological observation of the worm
During the period from November 1983 to March 1984, the natural infection of Moniliformis in house rats and cockroaches were surveyed in Osaka City. A total of 138 rats, 114 Rattus norvegicus and 24 R. rattus, were investigated. These rats were captured at three different places; Place A where nearly 50 small restaurants and snack bars gathered closely at the first and second basements of a terminal station in the south part of the city, Place B where about 100 small restaurants cluster in a two-story building nearby a terminal station in the north part of the city, and Place C is the general residential area of the city. The infection rates of Moniliformis among rats bigger than 50 g in the body weight were 93.9% of 33 R. norvegicus from Place A, 62.5% of 16 R. norvegicus and 28.6% of 7 R. rattus from Place B, and 2.2% of 46 R. norvegicus from Place C, respectively. None of 10 R. rattus from Place C were infected. Among the rats smaller than 50 g, two of 8 R. norvegicus from Place A was infected, but other 11 R. norvegicus and 7 R. rattus from Place B and C were negative. A total of 507 worms were collected, and all of them were identified as Moniliformis dubius Meyer, 1932. The male:female ratio of the worms was 1:1.3. The proboscis size of worms larger than 50 nm in the body length was 460-520 .times. 180-200 .mu.m (in average, 488 .times. 187 .mu.m) in males, 490-590 .times. 170-210 .mu.m (515 .times. 196 .mu.m) in females. The proboscis of females was significantly larger than that of males in average (p < 0.01). The proboscis size was larger in proportion to that of trunk. Proboscis hooks were 12 .times. 9-12. The egg size was 106-123 .times. 57-65 .mu.m (115 .times. 61 .mu.m) at outer shell, 85-98 .times. 38-45 .mu.m (93 .times. 41 .mu.m) at inner one. A total of 59 cockroaches were caught at Place A, consisting of 8 Periplaneta americana, 1 P. fuliginosa and 50 Blattella germanica. At dissection, cystacanths were detected from 7 P. americana, 1 P. fuliginosa and 2 B. germanica, respectively. The largest number of cystacanths isolated from one individual was 196 in a P. americana.


Accession: 006740437



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The prevalence of Moniliformis dubius Meyer, 1932 (Acanthocephala) among house rats and cockroaches in Osaka, Japan, and the morphological observation of the worm. Japanese Journal of Parasitology 34(5): 377-387, 1985

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