• Parasites, Hosts and Diseases
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• v.34 no.1
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• pp.27-34
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• 1996

The geographical distribution and population density of rodents and chigger mites at six localities of Chollanam-do were investigated from October to December in 1993. Among total 142 field rodents collected by the modified Chemin wooden traps, 131 rodents were Aponemw usrari,us (92.3%) and 11 were Crocidurc losiurc (7.7%). Out of 142 field rodents, 92 were parasitized by chiggers, showing 69.0% of the infestation rate and 74.2 of the chiggor index. Infestation rate and chigger index of A. omfernrius and C. lusiurc were 73.3%, 80.4 and 18.2%, 0.5, respectively. From the trapped field rodents, 10,532 chiggers were collected and identified with 11 species of 4 genera. Leptotrombidium pcLLinun. the vector 3pecies of tsutsugamushi disease, was the dominant species, showing 8,038 chi99ers (76.31%). L. scutellnre was the second dominant species showing 1,359 chiggers (12.9%). The distribution of chigger mites was clearly localized by the species, showing the different dominant species according to localities. The predominant species was 1. scutellare (100%) in Changhung-gun, 1. scutellcre (41.5%) in Posong-gun, 1. pnllidum (88.8%) in Hwasun- gun, 1. pnLlidunl (59.2%) in Koksong-gun, 1. zetum (77.3%) in Hampyong-gun, and 1. pclpcle (63.4%) in Tamyang-gun. Regarding to the geographical distribution of chigger population density, the infestation rate and chigger index was most high in Hwasun-gun as 62.4% and 216.2 respectively, and next high in Koksong-gun as 22.4% and 77.7%, respectively.

• Fisheries and Aquatic Sciences
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• v.5 no.2
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• pp.141-143
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• 2002

The treatment efficacy of oral administration of praziquantel against the blood-sucking monogenean Microcotyle sebastis under the commercial rockfish-culture conditions was evaluated. The quantity of praziquantel added to the food was calculated so that the amount of praziquantel ingested daily by fish was 200mg or 400mg/kg body weight (bw). The fish were fed a moist-pelleted fish meal supplemented with praziquantel at an rate of 0 (control), 200 or 400 mg of praziquantel per kg bw, respectively, for 3 times at an interval of 24 h. On 1 day to 8 days after the treatment, 10 fish were taken randomly from each net-pen daily (80 fish in each group in total), and the efficacy of each treatment was confirmed. Abundance of worms were significantly reduced in groups fed praziquantel-supplemented diets. The results clearly demonstrated that feeding the praziquantel-supplemented diet was effective for controlling M. sebastis infestation in practical commercial rockfish-culture systems without imposing any handling stress.

• Asian-Australasian Journal of Animal Sciences
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• v.6 no.2
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• pp.301-303
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• 1993

Hematological value were determined from 140 Fasciola gigantica infested and 138 non-infested apparently healthy (control) zebu cattle from eight different sites of Bangladesh. The F. gigantica infested cattle have experienced of normocytic normochromic anemia indicated by the significant (p<0.01) decline of total erythrocyte count, hemoglobin level, packed cell volume and mean corpuscular hemoglobin concentration and significant (p<0.01) increase of erythrocyte sedimentation rate, as compared with non-infested control animals. Values of mean corpuscular volume and mean corpuscular hemoglobin content were not differed significantly between the infested and control animals. There observed significantly (p<0.01) higher eosinophil and neutrophil counts and significantly (p<0.01) lower lymphocyte counts in fasciola infested cattle in comparison with the control animals.

• Journal of Veterinary Clinics
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• v.26 no.5
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• pp.450-456
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• 2009

This study evaluated the efficacy of topical eprinomectin (0.5% pour-on solution, $Eprinex^{(R)}$, Merial) against Chorioptes texanus (C texanus) infestation in dairy cows reared in Korea. Dairy cows naturally infected with C texanus showed skin lesions as alopecia, erythema, excoriations and crusts on the tail head, the caudal folds, the back of udder and the rump area. Fourteen adult Holstein dairy cows with chorioptic mange at National Institute of Animal Science were selected on the basis of gross lesion and microscopic examination. Experimental dairy cows infected with chorioptic mange were treated with eprinomectin ($Eprinex^{(R)}$, Merial, France) at the rate of 1 ml /10 kg/BW. Evaluation of therapeutic effect is based on mite counts and gross lesion at weekly interval for 6 weeks. Milk yields were measured every day and calculate at the mean of milk yield at weekly interval. Mange mites absolutely removed after 1 week of topical eprinomectin against C. texanus infestation on dairy cows. The skin lesion of dairy cows infested with C. texanus recovered normal status after 6 weeks of eprinomectin treatment. After eprinomectin treatment, return to the normal level of milk yields in diary cows infested with C. texanus has indirectly indicated that C. texanus infestation have negative effect on productivity of dairy farm. However, it would be suggested that the investigation of actual condition and the effective control method of C. texanus infestation of dairy farms in Korea should be studied in the future.

• Journal of agricultural medicine and community health
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• v.11 no.1
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• pp.3-11
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• 1986

In order to observe the infestation rate and intensity of C. sinensis in Yeoju Eup, Kyung-gi Do, 9,512 stool specimens were collected from the inhabitants through student's helps. The specimens were examined by cellophane thick smear technique and Stoll's egg dilution technique. The epidemiological status was analysed statistically by the regession equation and catalytic curve with the results obtained from this area. The results are as follows: 1) Collection rate oft he stool samples was 66.5%, 9.512 out of 14,300 inhabintants complied with our survey. 2) The infestation rate of C.sinensis was 5.0%, and for male 7.8%, for female 2.3%. 3) Average E.P.G. by Stoll's egg dilution technique in this area was 1,572, and for male 1,853, for female 676. 4) The degree of the intensity of C. sinensis infection by E.P.G. count was distributed as 65.2% in light infection, 32.0 % in moderate infection, 2.8% in heavy infection and none in very heavy infection. 5) The intensity of endemicity in this area was represented with the regression equation calculated with cumulative percentages of E.P.G. counts. Regression equation was y=3.887+1.695 log x and Cs. $D_{50}$ was 4.54. 6) The two-stage catalytic model was applied and the calculation lead to the equation $y=0.267(e^{-0.004t}-e^{-0.019t})$; a=0.004 < b=0.019. 7) Other helminthic infection rate in this area was 1.4% in A.lumbricoides 2.7% in T. trichiura, 1.6% in M. yokogawai md 0.2% in Taenia sp. respectively.

• Korean journal of applied entomology
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• v.20 no.2 s.47
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• pp.98-102
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• 1981

For the investigation of seasonal fluctuation of immature (lavae and pupae) beanfly, infestation rates, and habit, several soybean-cultivars were planted at Kumgok Experiment Farm of KAERI by three different planting times at 25-day intervals. Infestation rates of beanflies were ranged from $85\%\;to\;100\%$ in accordance. with the planting dates, where an increase in infestation rate was found with delay in planting dates. Immature beanflies were already observed from lune 20 by plant dissection counts. Three peaks of the seasonal fluctuation of lava were shown by occurring on July 10, August 10 and 50 during the soybean cultivation, while two peaks of pupal appearances were found. The most high peaks of lavae and pupae occurred on August 10 and 30, respectively. The lava were habitable in the pith or cortex tissue of soybean stem. They prepared tiny hole on the axilla as well as the internode of stem, and then they pupated in the holes from which the adults are able to escape. Immature beanfly seemed to prefer invading to the underground part of the stem when the soybean plants were in young stage.

• Parasites, Hosts and Diseases
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• v.30 no.1
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• pp.49-52
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• 1992

After evaluation of presence of nits and/or lice, PARATM aerosol (bioallethrin with piperonyl butoxide) was applied to 97 women and 43 girls, regardless of the results of their infestation, living at 2 separate institutions. Twelve days after the first treatment the second treatment was carried out and the presence of head lice was examined for the evaluation of treatment effect. Among total 140 subjects, 98(70,0%) were nit positive and 85(60.7%) were louse positive. The infestation rates of girls by nit(86.0%) and louse(86.0%) were higher than those of women, nit 62.9% and louse 49.5%(p<0.01). Also the detection rate of lice among nit positive subjects was higher in girls(100%) than in women(78.7%). On the second evaluation 12 days after treatment, 36(97.3%) out of 37 girls and 46(95.8%) out of 48 women were found louse-free. There was no difference in the treatment efficacy between the women and girls.

• Journal of fish pathology
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• v.22 no.3
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• pp.201-210
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• 2009

Although Anisakis type larvae have been shown to cause various injuries directly or indirectly in humans and animals, the epidemiological studies on these larval infestations are in insufficient state. The status of larval infestation was investigated in 989 fishes of 44 species, which are inhabiting around the east-westernsouth costal area of Korea during the period from March 2007 to February 2008. The Anisakis type larvae were infected approximately 38% (377 fishes) in 989 fishes. Most of the worms were identified as Anisakis simplex type I by morphological finding and 18S ribosomal DNA sequence analysis. In the seasonal variations of infestation, most of the fishes showed higher infestation rate during spring and summer, while the fishes such as herring Clupea pallasii did during winter. From the histopathological studies of infested fishes, it has been observed that Anisakis type larvae are harbouring mainly around the intestinal viscera such as liver, pancreas, stomach, pylolic cecum, and cloaca.

• Journal of fish pathology
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• v.26 no.3
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• pp.139-148
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• 2013

The genus Polydora(Polychaeta, Spionidae) includes many species well known for their activity as borers. They often become harmful invaders by reducing the growth rate and meat yield of, or inducing the mortality of commercially important mollusck, abalone, Haiotis discus hannai. In 2012, the frequency of the Polydora was observed with 5~99% in live abalone and 5.3~70.3% in dead abalone shells of abalone sea-caged aquaculture system, Korea. There are many nacreous blister in the ventral margin and inner of the infestated abalone by abalone in response to the Polydora. A worm bored two holes in the shell and come in and out for ingestion the organic matters. They are more than 40 mm in length and had outstanding palps with black bars, disc form pygidium and 4 eyespots. This is the first record for the statue of Polydora infestation of sea-caged cultured abalone, Haliotis discus hannai in Korea.

• Parasites, Hosts and Diseases
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• v.49 no.1
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• pp.95-98
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• 2011

Head louse infestation (HLI) is one of the most frequently occurring parasitic diseases in children. This study was conducted to investigate the socioeconomic and personal factors influencing HLI in the Republic of Korea. A total of 2,210 questionnaires about various factors related to HLI were obtained from children in 17 primary schools throughout the country. The rate of HLI was significantly lower in children who lived together with mother or in a family where both parents worked. In addition, HLI was lower in children whose fathers or mothers were public officers or teachers. However, HLI was higher in children who had small families and washed their hair less often. Education levels of parents and the number of children in family were not significant. Improvement of socioeconomic factors and personal hygiene will be helpful for reducing HLI.