In order to determine the prevalence of Necator americanus, 182 fecal samples were collected from school children in the Taegu vicinity. These sample were subsequently cultured by the Harada-Mori technique. Necator americanus was differentiated from Ancylostoma duodenale using the bases of morphological characteristics of filariform larvae. Necator americanus was not found in the vicinity of Taegu.
parasitology-helminth-nematoda- Necator americanus ; epidemiology

This study was undertaken to evaluate the present status of hookworm infections in Korea from October 1976 through September 1978. The stool specimens of 5,632 persons(male 3,689: female 1,943) collected from primary and middle schools, foundling asylums, and the general populations of various parts in Korea were examined The methods employed were brine floatation technique for the prevalence rate of hookworm infections, Kato's cellophane thick smear technique for the other helminthic infections, and Stoll's dilution egg counting technique for the intensity of hookworm infections. Ancylostoma duodenale and Necator americanus infections were classified by polyethylene tube coproculture method and by the evacuated adult worms after administration of anthelmintics against the patients infected with hookworms. The following results were obtained in this study. The prevalence rate of hookworm infections in rural area was higher than in urban area in the ratio of 2.4:1. And in the age group of over 20, the prevalence rate in significantly higher than that in urban area in the ratio of 5.8:1. In the urban area, difference in the prevalence rate of hookworm infections between the age group of over 20 and that of under 19 was not observed. But in the rural area, the ratio of the prevalence rate between the age group of over 20 to that of under 19 was 8:1. The prevalence rate of hookworm infections in female was higher than that in male in all age group except the age group of under 9 and 20-29. The ratio of the prevalence rate between female to male was 1.5:1 in total population. The area which showed the mean E.P.G. of over 1,000 was not found and almost all of the patients who were infected with hookworms gave the mean E.P.G. between l-999. Necator americanus was newly found in Dangjin Gun, Boseong Gun, Habcheon Gun and Weonseong Gun. In these 4 newly found areas, Dangjin Gun and Boseong Gun showed the composition rate of 25.5 percent and 83.4 percent respectively.
parasitology-helminth-nematoda ; hookworm-epidemiology ; Ancylostoma duodenale ; Necator americanus

A new anthelmintic, amidantel(Bay d 8815), an acetylated p-amino-phenyl-acetamidine was tried in 140 patients with Ancylostoma duodenale and other helminth infections. In the first trial, each 16 cases in 64 patients with A. duodenale were treated with 3.0, 6.0 and 9.0 or 10.0 mg/kg body weight of amidantel including placebo control. Another 76 patients infected with hookworms and other helminths were treated with 5.0, 6.0 and 8.0 mg/kg body weight of amidantel in the second trial. In order to assess the efficacy and safety of the drug, follow-up examination by repeated and replicated examinations over three consecutive days were performed at 14 to 16 days and 28 to 30 days after treatment, And complete laboratory studies including ECG were carried out before and one day after the medication. In the results, it was confirmed that amidantel is very effective against A. duodenale as well as Ascaris lumbricoides. With regard to dosage, a single dose of 6.0 mg/kg body weight of amidantel was found to be the most effective and well tolerated than the other dosages employed. In a single dose of 6.0 mg/kg body weight the cure rates were 93.8 and 96.6 per cent for A. duodenale infection and 90.9 and 93.1 per cent for ascariasis in the first and second trials respectivley. Relatively significant activity was also observed against Necator americanus at the dosages employed, however it was not superior to other drugs currently use. No significant activity was noted against Trichuris trichiura. Side effects including headache, nausea, dizziness and abdominal discomfort were usually mild and transient. No significant changes attributable to therapy were observed in hematology, blood biochemistry and urinalysis as well as ECG.
parasitology-helminth-nematoda ; amidantel ; acetylated p-amino-phenyl-acetamidine ; chemotherapy-Ancylostoma duodenale ; Necator americanus