When enterobiasis cases were treated with anthelmintics only for one time, the interval to recurrence was variable by different drugs used. And this phenomenon is supposedly connected with biological or developmental cycle of the worm and the consequent efficacy of the different anthelmintics. This study was undertaken to confirm this fact by studying the expelled worms morphologically to correlate the anthelmintics efficacy and stage of worm development in Enterobius vermicularis. A total of 131 children in 3 orphanages was examined by 4 anal swabs (mean positive rate, 80%). They were randomized into 5 experimental groups. Each group was treated with placebo, mebendazole, pyrantel, pyrvinium , and piperazine (70 mg/kg, single dose) respectively. After treatment, all stool were collected for 3 days to get the expelled Enterobius. A total of 6,165 pinworms was studied under the microscope. The sex was discriminated and the length was individually measured. A number of male pinworms was collected in all groups. Females of 2-11 mm in length were also collected in 5 groups. However, significantly larger number of short females was observed in mebendazole group compared with other groups. Twenty-one days after the first treatment, all children were again treated with mebendazole. Once more stool were examined. A total of 1,853 worms was collected. In mebendazole group, there were no females longer than 8.74 mm in the second treatment. In pyrvinium group, 8.31mm in lenght was the longest for female. However in control, pyrantel and piperazine groups, females of 2-11 mm in length were collected. From above results, one could conclude that the removing ability of mebendazole and pyrvinium was satisfactory for the worms in the early stage of development in Enterobius. Pyrantel and single dose of piperazine showed less effective in worm reduction ability especially on those at the early stages.
parasitology-helminth-nematoda ; Enterobius vermicularis-enterobiasis ; chemotherapy ; mebendazole ; pyrantel ; pyrvinium ; piperazine ; morphology

A single dose (2.0, 5.0, 10.0 mg/kg) of pyrantel embonate given to three groups consisting 301 children with Ascaris lumbricoides infection achieved a cure rate of 91.3%, 94.4% and 98.9% respectively. Whereas in the other two groups of 71 and 75 patients who received 75 mg/kg body weight with piperazine adipate 2 or 3 consecutive days, the cure rates were 62.0% and 74.7% respectively. Administration of a single recommended dose of santonin-kainic acid complex given to 77 patients achived a cure rate of 80.5% with 91.0% of egg reduction rate. The cure rate resulting from a single lowest dose 2.5 mg/kg pyrantel embonate was significantly higher than those of piperazine adipate and santonin-kainic acid complex in the mass treatment for ascariasis. in addition to the group of 2.5 mg/kg pyrantel embonate treatment, the side effect was lesser than those of the other groups. Considering the efficacy and safety of pyrantel embonate against Ascaris lumbricoides, it would be one of the useful agents for the mass treatment of Ascaris control.
parasitology-helminth-nematoda-Ascaris lumbricoides ; pyrantel embonate ; piperazine adipate ; santonin-kainic acid complex ; chemotherapy

The evaluation of the effects of anthelmintic drug dose was done by the eggs reduction and the eggs negative conversion rate. The drug dose according to the age of the patient was estimated by the formula of Augsberger, the dose according to the body weight of patient was estimated by the Rule of Six, and the dose to the body surface of the patient was estimated by the formula of Costeff. It is considered that the application of the drug dose according to the age of the patient resulted in reduction of dose in the younger patient, and resulted in the excess dose in older patient. The application of the drug dose according to the body weight also resulted in the reduction of dose in the lighter patient and the excess dose in the heavier patient. It is suggested that the application of drug dose according to the body surface is more reasonable than those by the age and the body weight. The value of this application was also proved to be medium value between those of age method and body weight method.
parasitology-helminth-nematoda-Ascaris lumbricoides ; pyrantel pamoate ; piperazine adipate ; santonin-kainic acid complex ; chemotherapy ; drug evaluation ; body weight ; body surface ; age