Thirty-six females and 1 male of Aedes bekkui were captured at human bait in Kyungki Province, Korea Republic, in June 1987. This is the 1st time the species has been recorded from that country. Notes on the taxonomic diagnosis of adults and larvae are given.
parasitology-arthropoda ; Aedes bekkui ; taxonomy

Boophilus microplus (Canestrini, 1887) female specimens were subjected to scanning electron microscopy for the observation of surface fine structures. Morphological characteristics observed were summarized as follows: The palpi were wider than long, and compressed, ridged dorsally and laterally. There were usually four pairs of ventro-internal setae on the articles. The hypostome dentition was usually 4/4 but occasionally 5/5. The basis capituli were hexagonal dorsally and the porose area was distinct with the holes developed well. There were numerous folds resembling finger prints around the female genital pore. A pair of anal lobes with specified setae on them was also recognized as one of the morphological characteristics.
parasitology ; arthropoda ; electron microscopy ; tick ; Boophilus microplus

The surface fine structures of Ixodes persulcatus (Schulze, 1930) male and female specimens were observed by means of a scanning electron microscope. A brief review on the biology of the ticks and their disease relationships was also presented. The sexual dimorphism of the specimen was marked; the male was quite smaller than the female. The genital groove was well developed and deep, the anal groove was distinct and characteristically extending anteriorly around the anus. The 4th article was much reduced and situated on the top of the 3rd article ventrally. The hypostome dentition was usually 3/3. The bottom of the basis capitulum of the male specimen was strictly straight in shape. This species was regarded as one of the most important vectors for infectious diseases of migrating birds.
parasitology ; arthropoda ; electron microscopy ; tick ; Ixodes persulcatus

Aedes alboscutellatus was recorded first in Korea. This mosquito was collected near Demilitarized Zone of Korea Penninsula from 1979-1980. Its morphology and taxonomical position was described(abstracted from English content).
parasitology-arthropoda ; mosquito ; Aedes alboscutellatus ; morphology ; taxonomy

Normal Bangkok strain of X. cheopis which had little resistance to DDT in 1966 became moderately resistant in 1972 without any direct exposure to the insecticide. It was analyzed that the causes of resistance gaining were as follows. First, the possibility of being exposed unconsciously to DDT spray under malaria eradication program could not be ruled out, even in laboratory as far as ventilation windows would be open sometime. Insecticides from air spray through the window influenced the fleas kept in the pools. Second, it may be said that initial resistance to DDT has become greater and greater ecologically without any exposure of insecticides. A highly resistant strain of X. cheopis which survived after contacting 4% DDT for five times during one year period was obtained in the laboratory and it showed 100% survival at the highest concentration (4%) of DDT paper by 24 hour exposure. The hybrid forms between normal Bangkok strain and artificially mutated "Resistant Strain" were obtained by mixing the above two colonies. Regardless to the sexes of both ancestors, the results of resistance tests of hybrids showed that artificially gained resistance of fleas to DDT was inherited possibly by recessive hereditary role by pheonotype.
parasitology-arthropoda-flea-Xenopsylla cheopis ; resistance-DDT ; Bangkok strain ; DDT

A clinical case of Cheyletiella infestation on a dog born and raised in Korea is reported. A three-year old female Whippet was hospitalized due to a multiple fracture and displacement of the left scapula caused by a recent car accident. The mite infestation was not noticed at the time of hospitalization. The dog underwent multiple operations involving internal fixation of the fractured scapula with wire and a plate, followed by extensive chemotherapy with antibiotics and prednisolone. After two months of hospitalization, a pruritic dermatitis near the left scapula developed. Multiple white dandruff-like flakes were seen on the hair coat, especially over the dorsal spine and neck, and the dog expressed increased pruritus by frequently licking and scratching the affected areas. Local dense accumulations of skin debris that became crusty were also observed. Microscopic examination of a skin scraping revealed a heavy infestation of Cheyletiella yasguri, as identified by the presence of hooks of the palpi and the heart-shaped sensory organ on genu I. Immunosuppression elicited by the extensive administration of prednisolone was suspected for the initiation of the generalized mite infestation.
parasitology-arthropoda ; Cheyletiella yasguri ; mite ; dog ; case report ; immunosuppression

Following is the result of a survey hold over a two year period(1971-1972), on the appearence and disappearence of ticks on cattle in Cheju. Number of Haemaphysalis longicornis. Larvae: From the beginning of July to mid September larvae abounded reaching their peak during July and August. In 1971 their period was from July to September. In 1972 their period was from May to October. In both years their number reached their highest point in July and August(Table 1.2) Nymph: Ticks were found from February to October(1971) and January to December (1972), and they were especially plentiful during the periods of may (1971)(Table 1.2). Adult : Ticks were in evidence from April to October(1971) and January to December(1972). They were especially plentiful during the periods of July and August(1971) and August(1972). However, in 1972 they were also quite plentiful in June and July(1972)(Table 1.2). Percentage of Haemaphysalis longicornis. 1971(Fig. 1): February-May: nymph 94.1 percent, adult female 5.9 percent ; July-August: larvae 54.8 percent, 1972(Fig. 2) : January-May: larvae 18.2 percent, nymph 18.2 percent, adult female 3.8 percent; July-August: larvae 48.2 percent, nymph 11.6 percent, adult female 40.2 percent. Number of Boophilus microplus: larvae; Ticks were in evidence from April to October(1971) and January to December(1972). They were especially plentiful during the periods of June adn July(1971) and July to August(1972). However, in 1972 they were also quite plentiful in May. Nymph: Ticks were in evidence from January to December 1971 and 1972. They were especially plentiful during the periods of June and August(1971) and May to September(1972). However, in 1972 they were also quite plentiful in October and November. Adult: Ticks were in evidence from January to December 1971 and 1972. They were especially plentiful during the periods of July to September(1971) and July (1972). However, in 1972 they were also quite plentiful in May to August. Percentage of Boophilus microplus. 1971(Fig. 3): January-May: larvae 40.3 percent, nymph 32.3 percent, adult female 27.1 percent, July-August: larvae 31.2 percent , nymph 35.7 percent, adult female 33.5 percent. 1972(Fig. 4): January-May: larvae 32.8 percent , nymph 42.1 percent, adult female 25.1 percent, July-August: larvae 44.2 percent, nymph 26.4 percent, adult female 29.4 percent.
parasitology-arthropoda-tick ; Haemaphysalis longicornis ; Boophilus microplus ; biology

In order to know the prevalence of head louse among the school children in rural area, we visited 3 primary schools and a kindergarten in Sanbuk-myon, Mungyong-gun, Kyongsangbuk-do in July 1985, and examined the children to identify the adult worms of head louse and/or its nits on the hair. The overall infestation rate was 91.9% among 420 children examined, and there was a difference between schools (P < 0.05). the school girls' rate, 96.1% was higher than that of bods' 88.9%(P < 0.05). By grade, the rate of infant school was 88.5% and 1st to 6th grade were 100, 100, 95.8, 90.4 89.7, 80.0% respectively. Above result indicates that the head louse is an important health problem in this community. Therefore, the chemotherapy and the effort to improve the hygiene are necessary in this community by physicians, teachers and health administrators.
parasitology-arthropoda ; head louse ; Pediculus humanus capitis ; epidemiology

The effects of salt on the development of Aedes togoi and the infecton of Brugia pahangi were studied. Salt concentrations over 7.2% completely got rid of pupae and adults. The salt concentrations 0% to 3.6% reduced pupal development from 86.6% to 72.8% and adult from 70.3% to 53.3%. B. pahangi infestations and infection rates were also reduced in the mosquitoes reared at salt concentrations of 1.8% and 3.6%. Trends of retardation in the filarial development were observed when the salt concentrations were increased.
parasitology-arthropoda ; Aedes togoi ; nematoda-Brugia pahangi ; salt ; development

The head louse infestation had been no problem since 1960s in Korea. However, the present study revealed highest infestation rate among the primary school children in Seosan-gun, Chungnam Province in July 1983. The cases of louse positive were determined by identifying the adult worms and/or their nits on scalp and hairs. The overall louse positive rate among 615 children examined was 73.5 percent. The rate was higher in girls (78.8 percent) than in boys (67.6 percent) and was highest in 3rd-4th school grades. It was observed that the more the number of family members the higher the infestation rate of children. The positive children were treated with 20 percent benzyl benzoate solution after the test for louscidal effect in petri dish. However, establishment of intensive control measure is needed to prevent further infestation.
parasitology-arthropoda ; Pediculus humanus capitis ; head louse ; epidemiology ; benzyl benzoate