Parasites, Hosts and Diseases

"Cryptosporidium hominis"

Brief Communications

Cryptosporidium hominis Infection Diagnosed by Real-Time PCR-RFLP: Hyeng-Il Cheun, Kyungjin Kim, Sejoung Yoon, Won-Ja Lee, Woo-Yoon Park, Seobo Sim, Jae-Ran Yu; Korean J Parasitol 2013;51(3):353-355.
Published online June 30, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.3.353

Abstract
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There are approximately 20 known species of the genus Cryptosporidium, and among these, 8 infect immunocompetent or immunocompromised humans. C. hominis and C. parvum most commonly infect humans. Differentiating between them is important for evaluating potential sources of infection. We report here the development of a simple and accurate real-time PCR-based restriction fragment length polymorphism (RFLP) method to distinguish between C. parvum and C. hominis. Using the CP2 gene as the target, we found that both Cryptosporidium species yielded 224 bp products. In the subsequent RFLP method using TaqI, 2 bands (99 and 125 bp) specific to C. hominis were detected. Using this method, we detected C. hominis infection in 1 of 21 patients with diarrhea, suggesting that this method could facilitate the detection of C. hominis infections.

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A survey of cryptosporidiosis among 2,541 residents of 25 coastal islands in Jeollanam-do (Province), Republic of Korea: Jae-Hwan Park, Hyo-Jin Kim, Sang-Mee Guk, Eun-Hee Shin, Jae-Lip Kim, Han-Jong Rim, Soon-Hyung Lee, Jong-Yil Chai; Korean J Parasitol 2006;44(4):367-372.
Published online December 20, 2006; DOI: https://doi.org/10.3347/kjp.2006.44.4.367

Abstract
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In order to determine the distribution and prevalence of human cryptosporidiosis on western and southern coastal islands of Jeollanam-do (Province), fecal samples were collected from 2,541 people residing on 25 islands, 13 in the western coasts and 12 in the southern coasts, during July and August 2000. Fecal smears were prepared following formalin-ether sedimentation of the samples and stained by a modified acid-fast procedure. The presence of Cryptosporidium oocysts was determined by light microscopy. Cryptosporidium oocysts were detected in 38 specimens (1.5%). The oocyst positive rate varied (0-6.0%) according to island; the highest was detected on Oenarodo (6.0%), followed by Naenarodo (5.6%) and Nakwoldo (5.4%). The majority (35 persons, 94.6%) of Cryptosporidium-infected individuals were older than 50 years of age. Men (22/1,159; 1.9%) were infected at a higher rate than women (16/1,382; 1.2%). The results of the present survey indicate that human Cryptosporidium infections (due to Cryptosporidium hominis and/or C. parvum) are maintained at a relatively low prevalence on coastal islands of Jeollanam-do, Republic of Korea.

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Original Article

Genotype analysis of Cryptosporidium spp. prevalent in a rural village in Hwasun-gun, Republic of Korea: Jae-Hwan Park, Sang-Mee Guk, Eun-Taek Han, Eun-Hee Shin, Jae-Lip Kim, Jong-Yil Chai; Korean J Parasitol 2006;44(1):27-33.
Published online March 20, 2006; DOI: https://doi.org/10.3347/kjp.2006.44.1.27

Abstract
PDF

Two species of Cryptosporidium are known to infect man; C. hominis which shows anthroponotic transmission between humans, and C. parvum which shows zoonotic transmission between animals or between animals and man. In this study, we focused on identifying genotypes of Cryptosporidium prevalent among inhabitants and domestic animals (cattle and goats), to elucidate transmittal routes in a known endemic area in Hwasun-gun, Jeollanam-do, Republic of Korea. The existence of Cryptosporidium oocysts was confirmed using a modified Ziehl-Neelsen stain. Human infections were found in 7 (25.9%) of 27 people examined. Cattle cryptosporidiosis cases constituted 7 (41.2%) of 17 examined, and goat cases 3 (42.9%) of 7 examined. Species characterizations were performed on the small subunit of the rRNA gene using both PCR-RFLP and sequence analysis. Most of the human isolates were mixtures of C. hominis and C. parvum genotypes and similar PCR-RFLP patterns were observed in cattle and goat isolates. However, sequence analyses identified only C. hominis in all isolates examined. The natural infection of cattle and goats with C. hominis is a new and unique finding in the present study. It is suggested that human cryptosporidiosis in the studied area is caused by mixtures of C. hominis and C. parvum oocysts originating from both inhabitants and domestic animals.

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