![]() Free-living worm species do not live on land but instead live in marine or freshwater environments or underground by burrowing. Various types of worm occupy a small variety of parasitic niches, living inside the bodies of other animals. Worms vary in size from microscopic to over 1 metre (3.3 ft) in length for marine polychaete worms (bristle worms) 6.7 metres (22 ft) for the African giant earthworm, Microchaetus rappi and 58 metres (190 ft) for the marine nemertean worm (bootlace worm), Lineus longissimus. Worms are many different distantly related bilateral animals that typically have a long cylindrical tube-like body, no limbs, and no eyes (though not always). ![]() Lumbricus terrestris, an earthworm White tentacles of Loimia medusa, a spaghetti worm By analyzing the data on the relationship between bathing interval and anal swab positive conversion, it was assumed that the positive rate of anal swab in a community represent the rate of appearance of gravid female Enterobius vermicularis through anus during approximately past two days prior to examination.For other uses, see Worm (disambiguation). ![]() vermicularis collected from anal swab negative cases was 9.1 whereas the number in anal swab positive cases was 31.5. With rare exceptions, the anal swab negative cases harbour relatively fewer number of Enterobius than those of positive cases. These results must come from the principle of anal swab that detect the terminated parasitism. The positive results of single anal swab did not correspond to the pinworm collection in average 9.1% of anal swab positive cases and the negative results did not correspond to pinworm collection in 81.3% of anal swab negative cases, when the data from three surveyed communities were amalgamated. Comparing with the pinworm collection rate after the chemotherapy in this group the estimated positive rate was by far lower than that of pinworm collection(89.3%). The results of successive two anal swabs and estimation of positivity in a population using Neyman's "Best asymptotically normal estimate" revealed 62.9% in the third trial group of this study and probability of finding eggs in single slide was 0.869. ![]() These results denote that results of single anal swab do not represent the prevalence rate of Enterobius infection in a community. Although the present authors could not collect the younger adult worms less than 3.54 mm in length after chemotherapy, the positive rates of pinworm collection in three surveyed communities were 80.6%, 92.5% and 91.4% respectively whereas the positive rates of single Scotch-tape anal swab were 52.4%, 53.6% and 57.1% respectively. vermicularis at certain point of time", the present authors treated the whole surveyed population with pyrantel pamoate disregard to the results of Scotch-tape anal swab and collected pinworms expelled in stool specimens during 2 consecutive days after the chemotherapy. Based on the epidemiological concept that the prevalence rate of Enterobius vermicularis infection in a community as "the proportion in the population who harboured E. ![]() The significance of Scotch-tape anal swab technique was evaluated in three communities of Korea, one in orphanage institute and two in rural populations, from November to December, 1975. ![]()
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