1.Susceptibility of Laboratory Rodents to Trichinella papuae.
Lakkhana SADAOW ; Pewpan M INTAPAN ; Thidarut BOONMARS ; Nimit MORAKOTE ; Wanchai MALEEWONG
The Korean Journal of Parasitology 2013;51(6):629-632
Members of the genus Trichinella are small nematodes that can infect a wide range of animal hosts. However, their infectivity varies depending on the parasite and host species combination. In this study, we examined the susceptibility of 4 species of laboratory rodents, i.e., mice, rats, hamsters, and gerbils to Trichinella papuae, an emerging non-encapsulated Trichinella species. Trichinella spiralis and Trichinella pseudospiralis were also included in this study for comparison. Fifteen animals of each rodent species were infected orally with 100 muscle larvae of each Trichinella species. Intestinal worm burden was determined at day 6 and 10 post-inoculation (PI). The numbers of muscle larvae were examined at day 45 PI. The reproductive capacity index (RCI) of the 3 Trichinella species in different rodent hosts was determined. By day 6 PI, 33.2-69.6% of the inoculated larvae of the 3 Trichinella species became adult worms in the small intestines of the host animals. However, in rats, more than 96% of adult worms of all 3 Trichinella species were expelled from the gut by day 10 PI. In gerbils, only 4.8-18.1% of adult worms were expelled by day 10 PI. In accordance with the intestinal worm burden and the persistence of adults, the RCI was the highest in gerbils with values of 241.5+/-41.0 for T. papuae, 432.6+/-48 for T. pseudospiralis, and 528.6+/-20.6 for T. spiralis. Hamsters ranked second and mice ranked third in susceptibility in terms of the RCI, Rats yielded the lowest parasite RCI for all 3 Trichinella species. Gerbils may be an alternative laboratory animal for isolation and maintenance of Trichinella spp.
Animals
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*Animals, Laboratory
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Cricetinae
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*Disease Susceptibility
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Gerbillinae
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Intestines/parasitology
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Male
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Mice
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Muscles/parasitology
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Parasite Load
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Rats
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Rodent Diseases/*parasitology/pathology
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Trichinella/*growth & development
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Trichinellosis/parasitology/pathology/*veterinary
2.Alteration of Cytokine Production during Visceral Larva Migrans by Toxascaris leonina in Mice.
Shin Ae KANG ; Mi Kyung PARK ; Min Kyoung CHO ; Hak Sun YU
The Korean Journal of Parasitology 2013;51(5):583-588
To determine alteration of immune responses during visceral larva migrans (VLM) caused by Toxascaris leonina at several time points, we experimentally infected mice with embryonated eggs of T. leonina and measured T-helper (Th) cell-related serial cytokine production after infection. At day 5 post infection (PI), most larvae were detected from the lungs, spleen, intestine, and muscle. Expression of thymic stromal lymphopoietin (TSLP) and CCL11 (eotaxin) showed a significant increase in most infected organs, except the intestine. However, expression of the CXCL1 (Gro-alpha) gene was most highly enhanced in the intestine at day 14 PI. Th1-related cytokine secretion of splenocytes showed increases at day 28 PI, and the level showed a decrease at day 42 PI. Th2-related cytokine secretion of splenocytes also showed an increase after infection; in particular, IL-5 level showed a significant increase at day 14 PI, and the level showed a decrease at day 28 PI. However, levels of Th17-related cytokines, IL-6 and IL-17A, showed gradual increases until day 42 PI. In conclusion, Th1, Th2, and Th17-related cytokine production might be important in immune responses against T. leonina VLM in experimental mice.
Animals
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Brain/parasitology
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Cytokines/*metabolism
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Female
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Gene Expression Regulation
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Heart/parasitology
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Interleukins/*metabolism
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Intestines/parasitology
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Larva Migrans, Visceral/*immunology/parasitology
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Liver/parasitology
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Lung/parasitology/pathology
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Mice
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Mice, Inbred C57BL
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Muscles/parasitology
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Spleen/parasitology
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Th1 Cells/immunology
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Th17 Cells/immunology
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Th2 Cells/immunology
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Toxascaris/*immunology
3.A Case of Pulmonary Paragonimiasis with Involvement of the Abdominal Muscle in a 9-Year-Old Girl.
Ah Rum CHO ; Hae Ran LEE ; Kwan Sub LEE ; Sang Eun LEE ; So Yeon LEE
The Korean Journal of Parasitology 2011;49(4):409-412
In Korea, many people enjoy eating raw or underkooked freshwater crayfish and crabs which unfortunately may cause paragonimiasis. Here, we describe a case of pulmonary and abdominal paragonimiasis in a 9-year-old girl, who presented with a 1-month history of abdominal pain, especially in the right flank and the right inguinal area, with anorexia. A chest radiograph revealed pleural effusion in both lungs, and her abdominal sonography indicated an inflammatory lesion in the right psoas muscle. Peripheral blood analysis of the patient showed hypereosinophilia (66.0%) and an elevated total serum IgE level (>2,500 IU/ml). The pleural effusion tested by ELISA were also positive for antibodies against paragonimiasis. Her dietary history stated that she had ingested raw freshwater crab, 4 months previously. The diagnosis was pulmonary paragonimiasis accompanied by abdominal muscle involvement. She was improved after 5 cycles of praziquantel treatment and 2 times of pleural effusion drainage. In conclusion, herein, we report a case of pulmonary and abdominal paragonimiasis in a girl who presented with abdominal pain and tenderness in the inguinal area.
Abdominal Muscles/*parasitology/pathology/ultrasonography
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Animals
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Anthelmintics/therapeutic use
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Brachyura/*parasitology
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Child
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Drainage
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Female
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Humans
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Lung/parasitology/pathology
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Lung Diseases, Parasitic/*diagnosis/drug therapy/radiography
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Paragonimiasis/*diagnosis/drug therapy/radiography
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Paragonimus/isolation & purification
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Pleural Effusion/parasitology/therapy
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Praziquantel/therapeutic use
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Republic of Korea
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Shellfish/*parasitology
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Treatment Outcome
4.An Outbreak of Trichinosis with Molecular Identification of Trichinella sp. in Vietnam.
Nguyen Van DE ; Nguyen Vu TRUNG ; Nguyen Hong HA ; Vu Thi NGA ; Nguyen Minh HA ; Pham Thanh THUY ; Le Van DUYET ; Jong Yil CHAI
The Korean Journal of Parasitology 2012;50(4):339-343
The 5th outbreak of trichinosis occurred in a mountainous area of North Vietnam in 2012, involving 24 patients among 27 people who consumed raw pork together. Six of these patients visited several hospitals in Hanoi for treatment. Similar clinical symptoms appeared in these patients within 5-8 days after eating infected raw pork, which consisted of fever, muscle pain, difficult moving, edema, difficult swallowing, and difficult breathing. ELISA revealed all (6/6) positive reactions against Trichinella spiralis antigen and all cases showed positive biopsy results for Trichinella sp. larvae in the muscle. The larvae detected in the patients were identified as T. spiralis (Vietnamese strain) by the molecular analysis of the mitochondrial cytochrome c oxidase subunit III (cox3) gene.
Adult
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Animals
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Antigens, Helminth/analysis/immunology
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*Disease Outbreaks
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Electron Transport Complex IV/genetics
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Enzyme-Linked Immunosorbent Assay
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Female
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Humans
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Larva
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Male
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Meat/*parasitology
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Mitochondria/genetics
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Muscles/parasitology/pathology
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Swine
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Trichinella spiralis/genetics/immunology/*isolation & purification
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Trichinellosis/*epidemiology/parasitology/pathology
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Vietnam/epidemiology