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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

, : 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

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.

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