• Title/Summary/Keyword: 기생률

Search Result 197, Processing Time 0.024 seconds

Recent Patterns of Intestinal Helminth Infections among the Residents in Taegu City, Korea (대구시민들에 있어서 장내회충류의 최근 감염상)

  • 주종윤
    • Parasites, Hosts and Diseases
    • /
    • v.22 no.1
    • /
    • pp.109-115
    • /
    • 1984
  • In order to estimate the recent patterns of intestinal helminth infections among the residents in Taegu City, Korea, a survey based on discovery of helminth eggs by formalin-ether sedimentation and modified Graham's scotchtape anal swab techniques, were performed during the period from March to September in 1983. A total of 1, 697 fecal specimens were collected from 854 male and 843 female residents from 5 village (Dong), each of whom were selected randomly to represent 1, 000 persons referred to the census in 1982. Among the specimens examined, one or more species of helminth parasites were found in 473, revealing the overall positive rate of 27.9 per cent. Of them, Trichuris trichiura was found most frequently, in 13.2 percent, followed by Enterobius vermicularis in 7.0 per cen t. Hookworm was the least prevalent. The sex-specific rate of overall helminth infections was a little higher in females than in males, while in cases of Clonorchis sinensis, Metagonimus yokogawai and Taenia species, the infection rates in males was higher than in females. T. trichiura was most prevalent in the 20~29 age group and showed about the same prevalence in males and females of all age groups. C. sinensis infection rate increased with age while those of Ascaris lumbricoides decreased. Single infections were 82.5 per cent of all positive cases. Of these, T. trichiura revealed the highest prevalence in 31.7 per cent, followed by E. vermiculasis in 20.1 per cent and A. lumbricoides in 14.8 per cent. Of the double infections, the percentage of T. trichiura in combination with other intestinal helminths was higher than that of A. lumbricoides. It was concluded that although the infection rates of intestinal helminths among the residents in Taegu City, Korea is still high, eradication of these parasitic diseases seems to be possible with twice-a-year administration of specific anthelmintics, in combination with extensive public health education and improvement of the dietary life.

  • PDF

Influence of Aggregation Pheromone of Riptortus clavatus (Heteroptera: Alydidae) on the Occurrence of Egg Parasitoid, Gryon japonicum (Hymenoptera: Scelionidae) (톱다리개미허리노린재의 집합페로몬이 노린재검정알벌의 발생에 미치는 영향)

  • Paik, Chae-Hoon;Kang, Seok-Min;Jeon, Yong-Kyun;Lee, Geon-Hwi;Choi, Man-Young;Oh, Young-Jin;Park, Chung-Gyoo;Hwang, Chang-Yeon
    • Korean journal of applied entomology
    • /
    • v.48 no.1
    • /
    • pp.67-72
    • /
    • 2009
  • The kairomonal activity of the aggregation pheromones of Riptortus clavatus for the egg parasitoid, Gryon japonicum, were investigated in soybean field. The parasitism rate of G. japonicum gradually decreased when the distances between pheromone traps and egg sites were increased from 0 to 15 m. The active distance of pheromone source for parasitoid attraction was estimated to be ca. 15 m. Under field conditions, the parasitoid wasp population peaked during the late August and early September, and the parasitism rate increased when the number of pheromone traps was increased from one to three per $165\;m^2$. However, insecticide-treated plots, the level of parasitism recorded is relatively low. Sex ratios in field populations of G. japonicum were female-biased.

Epidemiological Studies of Digenetic Trematodes in Yongyang County, Kyungpook Province (경북 영양퇴역 흡충류 역학조사)

  • 정동일;김영인
    • Parasites, Hosts and Diseases
    • /
    • v.29 no.4
    • /
    • pp.325-338
    • /
    • 1991
  • The present study was undertaken to determine the endemicity of trematode infections in Yongyang County, Kyungpook Province, Korea. One hundred and seventy-seven out of 955 residents examined were found to be infected with one or more kinds of helminthes. The prevalence rate was 18.5%. Among them, 70 were found to be infected with Clenorchis sinensis, 74 with Meta-gonimus sp. and 2:l with both flukes. The eggs of Fasciolidae were demonstrated from two specimens. The prevalence rate of clonorchiasis in males was 12.6%, while that in females was 3.6% (p<0.05). The prevalence of metagonimiasis in males was 12.0% and was also significantly higher than 6.1% in females (p<0.05). The intensity of both infections was significantly heavier in males than in females. The prevalence of both nukes was higher in residents of oyer 30 years of age than in those below that age. No correlation was found between the intensity and the age group. Among eight species of the fresh-water fish collected at the Panbyon River, Zacco temmincki was found to be the most frequently and heavily infested with metacercariae of Metagonimus sp., and Gnathopogon asromaculatus alone was found to be infested with metacercariae of Clonorchis sinensis. The present results suggest that Yongyang area still remains endemic with Clonorchis sinensis and Metagonimus sp. infection.

  • PDF

Intestinal parasitic infections of Korean Army soldiers in Whachon-gun, Korea (강원도 화천군 주둔 한 군부대 장병의 장내 기생충 감염률)

  • Sun Huh;Seung-Chul Huh
    • Parasites, Hosts and Diseases
    • /
    • v.31 no.3
    • /
    • pp.293-294
    • /
    • 1993
  • We examined stools of 113 soldiers of Korean Army in Whachon-gun, Korea in 1992. The eggs of Clonorchis sinetris (71113) and Metqsonimw sp. (31113), and cysts of Ginrdia lomblic (41113) were detected. No eggs of soil-transmitted helminths were found. Most of the CLonorchis-infected soldiers (6171 were recruited from Kyongsangnam-do.

  • PDF

Factors Influencing the Host Discrimination by Brachymeria lasus (Walker) (Hymenoptera: Chalcididae) (무늬수중다리좀벌 Brachymeria lasus (Walker) (벌목:수중다리좀벌과)의 숙주식별에 영향을 미치는 요인)

  • 이해풍;이장훈
    • Korean journal of applied entomology
    • /
    • v.30 no.4
    • /
    • pp.233-240
    • /
    • 1991
  • A female Brachymeria lasus (Walker) was exposed to one or four pupae of host Hyphantria cunea Drury for 20 minutes within a petri dish $(1.5\times9cm)$ to learn factors influencing the host discrimination by the parasitoid. It rejected the parasitized host with its rejection ratio 73.3% for the one pupal exposure vs 100% for the four pupal exposure scheme. The parasitoid could discriminate the parasitized host by its antennal drumming and ovipositor probing due to a pheromone-like external marking which is effective only for a certain peiod of time, and a host quality associated with the parasitoid development, respectively.

  • PDF

Study on Toxicity and Extermination of Monogenea, Benedenia sp. Parasited to Culturing Rock Bream, Oplegnathus fasciatus in Southern Korea (남해 양식산 돌돔, Oplegnathus fasciatus에 기생한 단생흡충류, Benedenia sp.의 구제 및 독성에 관하여)

  • 최상덕;공용근;백재민;방인철
    • Journal of Aquaculture
    • /
    • v.10 no.1
    • /
    • pp.1-7
    • /
    • 1997
  • In the southern sea of Korea, the culturing Rock bream, Oplegnathus fasciatus, ranging from 16.3 to 20.1cm in body length were sampled to examine how serious parasitic infection is. As a result, they were infected with 10 to 31 individuals of Monogenea, Benedenia sp. The parasitic sites of fish body was trunk (81.8%), caudal peduncle (16.5%) and the other portion (1.6%), and where ulceration and bleeding were observed with a large amount of muscus. When the treatment with formalin and freshwater were performed to get rid of the parasite, they were exterminated after 8 and 20 minutes in 100% and 70% freshwater, respectively and were killed after 10, 15 and 20 mimutes in the seawater added with formalin to be 250 ppm, 200 ppm and 150 ppm, 200 ppm and 150 ppm, respectively. During the treatment for parasite extermination, the fish showing a serious illness were dead in the 100% freshwater, whereas toxicity caused by formalin treatment was not detected in this study. The former is probably due to failure in the osmotic regulation of Rock bream.

  • PDF

Seasonality of the Infection of Acanthochondria brevicorpa (Copepoda) on a Gobiid fish Acanthogobius hasta off the south coast of Korea (한국 남해안의 풀망둑에 기생하는 요각류 Acanthochondria brevicorpa 감염률의 계절성)

  • SUH, HAE-LIP
    • 한국해양학회지
    • /
    • v.29 no.1
    • /
    • pp.1-4
    • /
    • 1994
  • The fish host, Acanthogobius hasta, was sampled monthly (April 1990 to March 1991) from Wando Islands, Korea, and examined for the parasitic Copepod Acanthochondria brevicorpa. Prevalence was positively correlated with fish length; parasitic copepods were only found in fishes > 24 cm TL. distinct seasonal variation in prevalence and intensity of A. brevicorpa infection was observed, although no data were available in April, June and July 1990 when no A. hasta was caught. Averaged over all samples, of the 83 fishes caught, 34.9% were infected with a mean intensity of 3 copepods per host No A. brevicorpa was found on the host between August and October. Ovigerous females of the Copepod were found between February and May, with an abundance peak in May. Young copepodids (Ci to CIII) of A. brevicorpa were not present throughout the year, but only late copepodids of CIV and CV were found on the fish in March and May. Results from the present study suggest that A. brevicorpa mainly produces larvae in spring, and may have a life cycle including additional hosts.

  • PDF

Distribution and Population Density of Rodents and Chigger Mites in Gokseong-gun of Jeollanam-do, Korea (전남 곡성군에서 포획한 들쥐 분포 및 털진드기의 개체군 밀도)

  • Song, Hyeonje
    • Korean Journal of Clinical Laboratory Science
    • /
    • v.48 no.3
    • /
    • pp.242-246
    • /
    • 2016
  • The distribution and population density of rodents and chigger mites were investigated between April 2013 and November 2013 in the Gokseong-gun of Jeollanam-do, Korea. A total of 79 rodents were collected using Sherman collapsible traps, and among them, 73 were Apodemus agrarius (92.4%), 4 were Crocidura lasiura (5.0%), and 2 were Microtus fortis (2.5%). Sixty-eight out of the 79 rodents were parasitized by chiggers, showing an infestation rate of 86.0% and a chigger index of 74.5; the chigger index of A. agrarius was 75.4. From the trapped field rodents, 5,063 chigger mites were collected and identified with 6 species of 2 genera. Leptotrombidium scutellare was the dominant species with 3,535 chiggers (69.8%), followed by L. pallidum with 777 chiggers (15.3%). This results showed that the distribution of chigger mites differ in dominant species according to seasons. L. pallidum was the predominant chigger collected in April (34.3%), May (70.0%), and June (55.1%); whereas L. scutellare was the predominant chigger collected in September (75.5%), October (71.8%), and November (74.2%).

Occurrence of Liriomyza trifolii and its Biological Control using Neochrysocharis formosa in Eggplant Greenhouse (시설가지에서 아메리카잎굴파리 발생과 Neochrysocharis formosa (Hymenoptera: Eulophidae)를 이용한 아메리카잎굴파리 밀도억제 효과)

  • Moon, Hyung-Cheol;Lim, Ju-Rck;Ryu, Jeong;Shin, Yong-Kyu;Hwang, Chang-Yeon
    • Korean journal of applied entomology
    • /
    • v.46 no.3
    • /
    • pp.425-430
    • /
    • 2007
  • Occurrence of Liriomyza trifolii and its biological control efficacy using Neochrysocharis formosa were evaluated in two eggplant cropping systems of spring and autumn cultivation. L. trifolii adults began to be attracted on a yellow sticky traps from late April and they increased from early June. A high density of L. trifolii adults was maintained from middle June to middle July. The releases of two N. formosa per plant with 3 times as weekly intervals from May 25, 2004 for spring culture resulted control effect of 90.1% in parasitism to L. trifolii in late July. The releases of two N. formosa per plant with 4 times as weekly intervals from August 31, 2004 for autumn culture resulted control effect of 81.3% in population of L. trifolii with 64.4-69.9% in parasitism.

A Trematode, Cercaria tapidis Parasitic in the Natural Stock of Tapes philippinarum (바지락에 기생하는 Cercaria tapidis Fujita에 대하여)

  • KIM Young-Gill;CHUN Seh-Kyu
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.14 no.4
    • /
    • pp.217-220
    • /
    • 1981
  • A trematode, Cercaria tapidis which is parasitic to short necked clam, Tapes philippinarum was studied in terms of its morphology and incidence of infection rate. The host bivalve was collected from Solri near Gunsan from September 1980 to August 1981. Sporocysts were observed mainly in tissues of gonad of the short necked clams. Minimum infection rate ($0.85\%$) was found in May, while maximum infection rate ($23.27\%$) in December. The sporocyst is 1.1 mm long and 0.27 mm wide. Ellipsoidal body of cercaria is $283{\mu}m$ long and $120{\mu}m$ wide. Oral sucker is much larger than ventral sucker. Moderately small pharynx, a long esophagus, and a long intestine reaching to the posterior end of the body are distinctive. Globular excretory bladder is located at the posterior part of the body and bears numerous granules of various size. The flame-cell arrangement is represented by a formula 2[(3+3+3)+(3+3)]=30. Tail is five times body length.

  • PDF