ORCID Profile
0000-0002-8380-1246
Current Organisation
South China Agricultural University
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Publisher: Elsevier BV
Date: 11-2018
Abstract: Cryptosporidium species differ in host range. Parasite-host coevolution, host adaptation, and geographic segregation have led to the formation of subtype families with unique phenotypic traits within the major human-pathogenic species C. parvum and C. hominis. Transmission intensity, genetic ersity, and occurrence of genetic recombination and selective pressure have further shaped their population genetic structures. Panmixia appears to be common within the zoonotic C. parvum, especially its hypertransmissible IIaA15G2R1 subtype. Genetic recombination in C. hominis, in contrast, is more restricted to virulent subtypes, especially IbA10G2. Nonhuman primates and equine animals are commonly infected with genetically ergent C. hominis populations. Systematic studies of these and other host-adapted Cryptosporidium spp. are likely leading to improved understanding of population structures underlying various transmission patterns and intensities of Cryptosporidium.
Publisher: CRC Press
Date: 06-04-2015
DOI: 10.1201/B18317
Publisher: MDPI AG
Date: 19-11-2021
DOI: 10.3390/ANI11113307
Abstract: The enteric parasite, Cryptosporidium is a major cause of diarrhoeal illness in humans and animals worldwide. No effective therapeutics or vaccines are available and therefore control is dependent on understanding transmission dynamics. The development of molecular detection and typing tools has resulted in the identification of a large number of cryptic species and genotypes and facilitated our understanding of their potential for zoonotic transmission. Of the 44 recognised Cryptosporidium species and genotypes, 19 species, and four genotypes have been reported in humans with C. hominis, C. parvum, C. meleagridis, C. canis and C. felis being the most prevalent. The development of typing tools that are still lacking some zoonotic species and genotypes and more extensive molecular epidemiological studies in countries where the potential for transmission is highest are required to further our understanding of this important zoonotic pathogen. Similarly, whole-genome sequencing (WGS) and licon next-generation sequencing (NGS) are important for more accurately tracking transmission and understanding the mechanisms behind host specificity.
Publisher: Centers for Disease Control and Prevention (CDC)
Date: 02-2014
Publisher: American Society for Microbiology
Date: 2011
DOI: 10.1128/JCM.01329-10
Abstract: Although widely used for the characterization of the transmission of intestinal Cryptosporidium spp., genotyping tools are not available for C. muris and C. andersoni , two of the most common gastric Cryptosporidium spp. infecting mammals. In this study, we screened the C. muris whole-genome sequencing data for microsatellite and minisatellite sequences. Among the 13 potential loci (6 microsatellite and 7 minisatellite loci) evaluated by PCR and DNA sequencing, 4 were eventually chosen. DNA sequence analyses of 27 C. muris and 17 C. andersoni DNA preparations showed the presence of 5 to 10 subtypes of C. muris and 1 to 4 subtypes of C. andersoni at each locus. Altogether, 11 C. muris and 7 C. andersoni multilocus sequence typing (MLST) subtypes were detected among the 16 C. muris and 12 C. andersoni specimens successfully sequenced at all four loci. In all analyses, the C. muris isolate (TS03) that originated from an East African mole rat differed significantly from other C. muris isolates, approaching the extent of genetic differences between C. muris and C. andersoni . Thus, an MLST technique was developed for the high-resolution typing of C. muris and C. andersoni . It should be useful for the characterization of the population genetics and transmission of gastric Cryptosporidium spp.
Publisher: American Society for Microbiology
Date: 09-2015
DOI: 10.1128/AEM.01699-15
Abstract: The occurrence of Cryptosporidium oocysts in drinking source water can present a serious public health risk. To rapidly and effectively assess the source and human-infective potential of Cryptosporidium oocysts in water, sensitive detection and correct identification of oocysts to the species level (genotyping) are essential. In this study, we developed three real-time PCR genotyping assays, two targeting the small-subunit (SSU) rRNA gene (18S-LC1 and 18S-LC2 assays) and one targeting the 90-kDa heat shock protein (hsp90) gene (hsp90 assay), and evaluated the sensitivity and Cryptosporidium species detection range of these assays. Using fluorescence resonance energy transfer probes and melt curve analysis, the 18S-LC1 and hsp90 assays could differentiate common human-pathogenic species ( C. parvum , C. hominis , and C. meleagridis ), while the 18S-LC2 assay was able to differentiate nonpathogenic species (such as C. andersoni ) from human-pathogenic ones commonly found in source water. In sensitivity evaluations, the 18S-LC2 and hsp90 genotyping assays could detect as few as 1 Cryptosporidium oocyst per s le. Thus, the 18S-LC2 and hsp90 genotyping assays might be used in environmental monitoring, whereas the 18S-LC1 genotyping assay could be useful for genotyping Cryptosporidium spp. in clinical specimens or wastewater s les.
Publisher: Elsevier BV
Date: 04-2022
Abstract: Zoonotic cryptosporidiosis is a major public health problem in industrialized nations in those countries it is caused mainly by Cryptosporidium parvum IIa subtypes that are prevalent in dairy calves. Because of the short history of intensive animal farming in China, strains of C. parvum are found only on some dairy farms in this country and are the IId subtypes. However, the prevalence of C. parvum is increasing rapidly, with IIa subtypes recently detected in a few grazing animals, and both IIa and IId subtypes are emerging in humans. As animal farming intensifies, China may follow in the footsteps of industrialized nations where zoonotic cryptosporidiosis is r ant. One Health and biosecurity measures are urgently needed to slow down the dispersal of autochthonous IId subtypes and imported IIa subtypes.
Publisher: Elsevier BV
Date: 2019
DOI: 10.1016/J.IJPARA.2018.07.003
Abstract: Foodborne zoonotic pathogens are a serious public health issue and result in significant global economic losses. Despite their importance to public health, epidemiological data on foodborne diseases including giardiasis caused by the enteric parasite, Giardia duodenalis, are lacking. This parasite is estimated to cause ∼28.2 million cases of diarrhoea each year due to contamination of food, but very few foodborne outbreaks have been documented due to the limitations of current detection as well as surveillance methods. The current method for the recovery of Giardia cysts from food matrices using immunomagnetic separation requires further standardisation and cost reduction before it can be widely used. It also should incorporate downstream molecular procedures for genotyping, and traceback and viability analyses. Foodborne giardiasis can be potentially controlled through improvements in national disease surveillance systems and the establishment of Hazard Analysis and Critical Control Point interventions across the food chain. Studies are needed to assess the true prevalence and public health impact of foodborne giardiasis.
Location: United States of America
No related grants have been discovered for Yaoyu Feng.