Parasites, Hosts and Diseases

"stray cat"

Brief Communication

Prevalence of parasitic infections in stray cats from Gimpo-si, Gyeonggi-do, Korea: Sooji Hong, Hyejoo Shin, Seungwan Ryoo, Chung-Won Lee, Jae-Young Park, Jong-Yil Chai, Bong-Kwang Jung; Parasites Hosts Dis 2025;63(2):182-187.
Published online May 26, 2025; DOI: https://doi.org/10.3347/PHD.24061

Stray cats serve as reservoir hosts for various zoonotic parasites, posing a significant risk of transmission to humans. This study aimed to assess the prevalence of parasitic infections in stray cats from Gimpo-si, Gyeonggi-do, Korea. A total of 101 fecal and 237 blood (serum) samples were collected from 237 stray cats captured through the trapneuter-return program in 2021. The samples were analyzed using microscopy, nested-PCR, and ELISA to detect parasitic infections. Fecal examination revealed that Toxocara cati eggs were present in 26.7% (27/101) of samples, while eggs of Spirometra sp. (2%), Clonorchis sinensis (1%), and Trichuris sp. (1%) were also detected. PCR analysis identified Toxoplasma gondii DNA in 17 (16.8%) fecal samples, while genetic markers of Cryptosporidium felis and Enterocytozoon bieneusi were each detected in 4 (4%) samples. Positive rates of IgM and IgG were 21.9% (52/237) and 21.1% (50/237) in serological tests for T. gondii-specific antibodies. This study confirms the widespread presence of zoonotic parasites in stray cats from Gimpo-si, highlighting the potential public health risks associated with these infections. Continuous surveillance and control measures are essential from a One Health perspective to reduce the risk of zoonotic transmission.

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Molecular detection of Toxoplasma gondii in wild oysters and seawater on the southeast coast of South Korea
Hyejoo Shin, Sooji Hong, Seungwan Ryoo, Jong-Yil Chai, Bong-Kwang Jung
Food Microbiology.2026; 134: 104925. CrossRef

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Original Articles

Potential Zoonotic Trematodes Recovered in Stray Cats from Kuwait Municipality, Kuwait: Osama Mohamed ElShfei El-Azazy, Nadra-Elwgoud Mohamed Ibrahim Abdou, Amal Iskander Khalil, Maha Khaled Al-Batel, Qais Abdulrazak Habeeb Majeed, Adawia Abdul-Ruhman Henedi, Laila Mohamed Azad Tahrani; Korean J Parasitol 2015;53(3):279-287.
Published online June 30, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.3.279

Abstract
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Stray cats are a common feature roaming the streets and alleys of Kuwait; they could be a source of parasites, including trematodes, that affect humans. A survey was conducted to identify feline trematodes and throw the light on their public health significance in Kuwait. Out of 240 stray cats trapped from different localities of Kuwait from June 2011 to May 2012, 59 (24.6%) were found to be infected with 14 species of trematodes. The most common were trematodes of the genus Heterophyes, particularly H. heterophyes and H. dispar that were found in respectively 15.8% and 10.8% of the cats examined. Other trematodes recorded, with lower prevalences, were Heterophyes nocens (2.9%), Haplorchis taichui (3.8%), Stictodora sawakinensis (2.1%), Stellantchasmus falcatus (1.6%), Echinochasmus japonicus (1.6%), and Mesostephanus dottrensi (1.3%). Centrocestus cuspidatus, Galactosomum fregatae, Ascocotyle sp., Mesostephanus appendiculatus, Haplorchis yokogawai, and Pygidiopsis genata showed the lowest prevalence (0.4%) and intensity. The majority of the trematodes are recorded for the first time in Kuwait and even in the Gulf region. The study reveals that stray cats are good indicators of fish-borne trematodes in the environment. As all trematodes recovered are zoonotic, their significance to public health should be considred.

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Mahdi Soroushianfar, Soheil Sadr, Alireza Sazmand, Shiva Dianaty, Javad Khedri, Rolf Karl Schuster, Hassan Borji
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Jong-Yil Chai, Bong-Kwang Jung
Food and Waterborne Parasitology.2017; 8-9: 33. CrossRef

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Toxoplasma gondii B1 Gene Detection in Feces of Stray Cats around Seoul, Korea and Genotype Analysis of Two Laboratory-Passaged Isolates: Bong-Kwang Jung, Sang-Eun Lee, Hyemi Lim, Jaeeun Cho, Deok-Gyu Kim, Hyemi Song, Min-Jae Kim, Eun-Hee Shin, Jong-Yil Chai; Korean J Parasitol 2015;53(3):259-263.
Published online June 30, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.3.259

Abstract
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The increasing prevalence of Toxoplasma gondii infection in the human population in the Republic of Korea (= Korea) is due to various reasons such as an increase in meat consumption. However, the importance of cats in transmitting T. gondii infection through oocysts to humans has seldom been assessed. A total of 300 fecal samples of stray cats captured around Seoul from June to August 2013 were examined for T. gondii B1 gene (indicating the presence of oocysts) using nested-PCR. Fourteen (4.7%) of 300 cats examined were positive for B1 gene. Female cats (7.5%) showed a higher prevalence than male cats (1.4%). Cats younger than 3 months (5.5%) showed a higher prevalence than cats (1.5%) older than 3 months. For laboratory passage of the positive samples, the fecal suspension (0.2 ml) of B1 gene positive cats was orally inoculated into experimental mice. Brain tissues of the mice were obtained after 40 days and examined for the presence of tissue cysts. Two isolates were successfully passaged (designated KNIH-1 and KNIH-2) and were molecularly analyzed using the SAG5D and SAG5E gene sequences. The SAG5D and SAG5E gene sequences showed high homologies with the ME49 strain (less virulent strain). The results indicated the importance of stray cats in transmitting T. gondii to humans in Korea, as revealed by detection of B1 gene in fecal samples. T. gondii isolates from cats were successfully passaged in the laboratory for the first time in Korea.

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Molecular detection and genotyping of Toxoplasma gondii in stray cat feces from Khorramabad, West Iran
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Zoonotic Intestinal Trematodes in Stray Cats (Felis catus) from Riverside Areas of the Republic of Korea: Sung-Shik Shin, Dae-Sung Oh, Kyu-Sung Ahn, Shin-Hyeong Cho, Won-Ja Lee, Byoung-Kuk Na, Woon-Mok Sohn; Korean J Parasitol 2015;53(2):209-213.
Published online April 22, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.2.209

Abstract
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The present study was performed to survey the infection status of zoonotic intestinal trematode (ZIT) in stray cats from 5 major riverside areas in the Republic of Korea. Total 400 stray cats were captured with live-traps in riverside areas of Seomjingang (‘gang’ means river) (203 cats) from June to October 2010, and of Yeongsangang (41), Nakdonggang (57), Geumgang (38), and Hangang (61 cats) from June to October 2011, respectively. Small intestines resected from cats were opened with a pair of scissors in a beaker with 0.85% saline and examined with naked eyes and under a stereomicroscope. More than 16 ZIT species were detected in 188 (92.6%) cats from Seomjingang areas, and the number of worms recovered was 111 per cat infected. In cats from riverside areas of Yeongsangang, Nakdonggang, Geumgang, and Hangang, more than 9, 8, 3, and 5 ZIT species were recovered, and the worm burdens were 13, 42, 11, and 56 specimens per infected cat, respectively. As the members of family Heterophyidae, more than 10 species, i.e., Metagonimus spp., Pygidiopsis summa, Heterophyes nocens, Stellantchasmus falcatus, Heterophyopsis continua, Acanthotrema felis, Centrocestus armatus, Procerovum varium, Cryptocotyle concava, and Stictodora lari, were recovered. More than 5 species of echinostomes, i.e., Echinostoma hortense, Echinochasmus japonicus, Echinochasmus sp., Echinoparyphium sp., and unidentified larval echinostomes, were collected. Plagiorchis spp. were detected in cats from areas of Seomjin-gang and Yeongsangang. From the above results, it has been confirmed that stray cats in 5 major riverside areas of Korea are highly infected with various species of ZITs.

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Prevalence of parasitic infections in stray cats from Gimpo-si, Gyeonggi-do, Korea
Sooji Hong, Hyejoo Shin, Seungwan Ryoo, Chung-Won Lee, Jae-Young Park, Jong-Yil Chai, Bong-Kwang Jung
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Prevalence of heterophyid infection in tilapia fish “Orechromas niloticus” with emphasize of cats role as neglected reservoir for zoonotic Heterophyes heterophyes in Egypt
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Brief Communication

Prevalence of Dirofilaria immitis Infection in Stray Cats by Nested PCR in Korea: Hyung-Jin Park, Sang-Eun Lee, Won-Ja Lee, Jung-Hyun Oh, Easwaran Maheswaran, Kyoung-Won Seo, Kun-Ho Song; Korean J Parasitol 2014;52(6):691-694.
Published online December 23, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.6.691

Abstract
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The purpose of this study was to conduct a survey of Dirofilaria immitis infection among stray cats in Korea using nested PCR. We included 235 stray cats (121 females and 114 males) and evaluated each for the presence of feline heartworm infection. Blood samples were collected from 135 cats in Daejeon, 50 cats in Seoul, and 50 cats from Gyeonggi-do (Province). Of the 235 DNA samples, 14 (6.0%) were positive for D. immitis. The prevalence of infection in male cats (8/114, 7.0%) tended to be higher than that in female cats (6/121, 5.0%), but the difference was not statistically significant. In each location, 8, 2, and 4 cats were positive for infection, respectively, based on DNA testing. No significant differences in the prevalence were observed among the geographic regions, although the rate of infection was higher in Gyeonggi-do (8.0%) than Daejeon (5.9%) and Seoul (4.0%). We submitted 7 of the 14 D. immitis DNA-positive samples for sequencing analysis. All samples corresponded to partial D. immitis cytochrome c oxidase subunit I gene sequences with 99% homology to the D. immitis sequence deposited in GenBank (accession no. FN391553). To the best of our knowledge, this is the first survey using nested PCR to analyze the prevalence of D. immitis in stray cats in Korea.

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Honglie Hou, Lili Cao, Wenzhi Ren, Dansheng Wang, He Ding, Juan You, Xinhua Yao, Hang Dong, Yanbing Guo, Shuxian Yuan, Xichen Zhang, Pengtao Gong
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Wei Cong, Qing-Feng Meng, Radu Blaga, Isabelle Villena, Xing-Quan Zhu, Ai-Dong Qian
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Original Article

Trematodes Recovered in the Small Intestine of Stray Cats in the Republic of Korea: Jong-Yil Chai, Young Yil Bahk, Woon-Mok Sohn; Korean J Parasitol 2013;51(1):99-106.
Published online February 18, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.1.99

Abstract
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In 2005, we reported the infection status of 438 stray cats with various species of intestinal helminths, including nematodes (4 species), trematodes (23 species), and cestodes (5 species) in the Republic of Korea. However, morphologic details of each helminth species have not been provided. In the present study, we intended to describe morphologic details of 13 trematode species which were either new fauna of cats (10 species) or new fauna of not only cats but also all animal hosts (3 species). The worms were fixed in 10% neutral buffered formalin under a cover slip pressure, stained with Semichon's acetocarmine, and then observed using a light microscope equipped with a micrometer. The 13 subjected species included members of the Heterophyidae (Stellantchasmus falcatus, Stictodora fuscata, Stictodora lari, Centrocestus armatus, Procerovum varium, and Cryptocotyle concava), Echinostomatidae (Echinostoma hortense, Echinostoma revolutum, Echinochasmus japonicus, and Stephanoprora sp.), Diplostomidae (Neodiplostomum seoulense), Plagiorchiidae (Plagiorchis muris), and Dicrocoeliidae (Eurytrema pancreaticum). By the present study, Cryptocotyle sp. and Neodiplostomum sp. recored in our previous study were identified as C. concava and N. seoulense, respectively. Three species, P. varium, C. concava, and Stephanoprora sp., are new trematode fauna in Korea.

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Brief Communications

Genotype of Toxoplasma gondii from Blood of Stray Cats in Gyeonggi-do, Korea: Hye-Youn Kim, Yun-Ah Kim, Ho Sa Lee, Ho Gun Rhie, Shin-Hyeong Cho, Jae-Ran Yu, Sang-Eun Lee; Korean J Parasitol 2009;47(4):413-415.
Published online December 2, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.4.413

Abstract
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Genotyping of Toxoplasma gondii has been performed in 23 PCR positive blood samples from stray cats in Korea. We used 2 separate PCR-restriction fragment length polymorphism (RFLP) patterns of SAG2 gene, amplifying the 5'and 3'ends of the locus. The results revealed that all samples belonged to the type I clonal lineage. Although T. gondii organisms were not isolated from the samples, the results of the present study represent that stray cats with T. gondii infection should be seriously concerned in our environment. Adequate and continuous control programs of stray cats are needed to reduce the risk of transmission of T. gondii as a zoonotic infection threatening the public health.

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Prevalence of Toxoplasma gondii in Stray Cats of Gyeonggi-do, Korea: Hye-Youn Kim, Yun-Ah Kim, Seungwon Kang, Ho Sa Lee, Ho Gun Rhie, Hye-Jin Ahn, Ho-Woo Nam, Sang-Eun Lee; Korean J Parasitol 2008;46(3):199-201.
Published online September 20, 2008; DOI: https://doi.org/10.3347/kjp.2008.46.3.199

Abstract
PDF

Toxoplasma gondii is an obligate intracellular zoonotic protozoan with a worldwide distribution. It infects humans as well as a broad spectrum of vertebrate hosts. Cats and wild felidae play crucial roles in the epidemiology of toxoplasmosis. This study was performed to survey the prevalence of T. gondii infection among stray cats in the Gyeonggi-do, Republic of Korea. A total of 174 stray cat blood samples were collected from Gwacheon-si (n = 20), Bucheon-si (82), and Yangju-si (72). Positive sera for T. gondii were identified in 14 samples (8.1%) exclusively via the latex agglutination test, 28 (16.1%) via ELISA, and 23 (13.2%) via PCR analysis. The overall infection rate of female stray cats (29.2%) presented as higher than that of male cats (24.0%). This study suggests that T. gondii is widespread in the stray cat population of Gyeonggi-do, Korea. It is urgently needed to control urban stray cat population and to reduce the risk of zoonotic transmission of toxoplasmosis to other animal hosts and humans.

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Original Article

Western blot analysis of stray cat sera against Toxoplasma gondii and the diagnostic availability of monoclonal antibodies in sandwich-ELISA: Woon-Mok Sohn, Ho-Woo Nam; Korean J Parasitol 1999;37(4):249-256.
Published online December 31, 1999; DOI: https://doi.org/10.3347/kjp.1999.37.4.249

Abstract
PDF

A total of 198 sera from stray cats was assayed against Toxoplasma gondii antigen by western blot. Out of 198 sera assayed, 26 sera (13.1%) showed typical blot patterns against T. gondii. When spotted by ELISA absorbance and indirect latex agglutination test (ILAT) titer, all 26 cases were distributed over the cut-off value of ELISA whereas 24 cases (92.3%) were in the positive range of 1:32 or higher and 2 cases in negative range by ILAT. Among western blot negative 172 sera, 162 cases were negative in both ILAT and ELISA while 10 cases were reactive falsely such that three cases were ILAT positive with 1:32 titer and 9 cases were ELISA positive (2 cases overlapped). These 10 cases reacted peculiarly without typical binding pattern in Western blot. Sandwich-ELISA was performed with monoclonal antibodies (mAbs) of Tg563 (30 kDa, SAG1), Tg505 (22 kDa, SAG2), Tg605 (43 kDa, SAG3), Tg556 (28 kDa, GRA2), Tg737 (32 kDa, GRA6), Tg695 (66 kDa, ROP2), Tg786 (42 kDa, ROP6), and Tg621 (32 kDa, anonymous but cytosolic) clone, respectively. All western blot-positive cases were in the positive range and negative cases in the negative range clearly. Among the 10 false reactive cases, 3 cases were in the positive range with one or more mAbs. All mAbs used in this study were confirmed to be specific to T. gondii infection as a standardized sandwich-ELISA to differentiate it from other pathogens.

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