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Lee H, Kwak D. Molecular detection and assemblage analysis of the intestinal protozoan Giardia duodenalis in wild boars in Korea. Front Vet Sci 2023; 10:1139060. [PMID: 37143496 PMCID: PMC10151744 DOI: 10.3389/fvets.2023.1139060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 03/28/2023] [Indexed: 05/06/2023] Open
Abstract
Giardia duodenalis (syn. G. intestinalis, G. lamblia) is the only Giardia species that infects humans and most other mammals. Wild boars are a reservoir of many viruses, bacteria, and parasites that can be transmitted to livestock and humans. This study examined the infection rate of G. duodenalis in wild boars and confirmed its specificity by comparing assemblages through PCR amplification of the 18S rRNA, gdh, and β-giardin genes. Fecal samples were collected from roadkilled or trapped wild boars from April 2016 to December 2021 in Korea. DNA was extracted directly from 612 wild boar fecal specimens using a commercial kit. PCR was performed targeting the 18S rRNA region, β-giardin, and glutamate dehydrogenase genes of G. duodenalis. Some PCR-positive samples were selected for sequencing analysis. The obtained sequences were subsequently used for phylogenetic tree construction. Of the 612 samples tested, 125 (20.4%) were positive for G. duodenalis. The highest infection rate was detected in the central region (12.0%) and in autumn (12.7%). Among the risk factors, the seasonal factor was statistically significant (p = 0.012). Phylogenetic analysis revealed three genetic assemblages: A, B, and E. Assemblages A and B exhibited 100% identity with Giardia sequences isolated from human and farmed pigs in Korea and Japan. This result cannot be ignored because it indicates the possibility of zoonotic transmission. Therefore, continuous management and monitoring of this pathogen are necessary to prevent transmission and protect animal and human health.
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Malebatja MF, Mokgatle MM. Diarrhoea among Children Aged 5 Years and Microbial Drinking Water Quality Compliance: Trends Analysis Study in South Africa (2008-2018). INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 20:598. [PMID: 36612920 PMCID: PMC9819380 DOI: 10.3390/ijerph20010598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/23/2022] [Accepted: 12/26/2022] [Indexed: 06/17/2023]
Abstract
In developing countries such as South Africa, diarrhoeal diseases are reported to be linked to inadequate drinking water quality, sanitation, and hygiene behaviours. The consumption of microbiologically contaminated drinking water has been reported to cause diarrhoea, mortality, and morbidity in children under the age of five years. This study evaluated the microbiological pathogens detected in municipal drinking water and diarrhoea trends for children under 5 years of age in South Africa between 2008 and 2018. A trends analysis study was conducted using secondary data on diarrhoea for children under the age of five years and microbial drinking water quality compliance. A negative correlation was found between the occurrence of microbial pathogens in water, morbidity, and mortality rates of children under the age of 5 years in South Africa. As compliance status improved, the mortality rate among children under 5 years old decreased by 31% over the study period. A conclusion can thus be drawn that the microbiological pathogens detected in drinking water at levels complying with SANS 241:2015 Edition 2 standards and diarrhoea incidences were not the primary cause of the mortality of children under 5 years old in South Africa between 2008 and 2018.
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Affiliation(s)
- Mohora Feida Malebatja
- Environmental and Occupational Health Department, Health Sciences Faculty, School of Health Systems and Public Health, University of Pretoria, Private Bag X 20, Hatfield, Pretoria 0028, South Africa
- Environmental and Occupational Health Division, Public Health Department, School of Healthcare Sciences, Sefako Makgatho Health Sciences University, Pretoria Ga-Rankuwa, Pretoria 0208, South Africa
| | - Mpata Mathildah Mokgatle
- Environmental and Occupational Health Division, Public Health Department, School of Healthcare Sciences, Sefako Makgatho Health Sciences University, Pretoria Ga-Rankuwa, Pretoria 0208, South Africa
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Strazdaitė-Žielienė Ž, Baranauskaitė A, Butkauskas D, Servienė E, Prakas P. Molecular Identification of Parasitic Protozoa Sarcocystis in Water Samples. Vet Sci 2022; 9:vetsci9080412. [PMID: 36006327 PMCID: PMC9412564 DOI: 10.3390/vetsci9080412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 06/13/2022] [Accepted: 08/03/2022] [Indexed: 11/16/2022] Open
Abstract
Simple Summary Members of the genus Sarcocystis are protozoan parasites having two-host prey–predator cycle. These parasites are widespread in farm animals. Sarcocystis species are characterized morphologically in intermediate hosts, and these parasites are identified in definitive hosts by molecular methods. Thus far, only few studies have been conducted on Sarcocystis parasites in environmental samples. The aim of the present work was to evaluate several sample preparation and polymerase chain reaction methods for the identification of several Sarcocystis species in water samples. Overall, 114 samples collected from various water sources, ponds, canals, lakes, lagoons, and rivers in Lithuania were tested for the presence of Sarcocystis spp. Based on molecular methods, eight Sarcocystis species, S. bovifelis, S. cruzi, S. hirsuta, S. arieticanis, S. tenella, S. capracanis, S. bertrami, and S. miescheriana, were identified. The main intermediate hosts of detected Sarcocystis parasites are cattle, sheep, goats, horses, and pigs. Further, more sensitive molecular techniques are needed for the development of the diagnosis of Sarcocystis species in water bodies. Abstract Sarcocystis parasites are among the most common parasitic protozoa in farm animals. So far, the diversity of these parasites has been mainly studied in animal carcasses by morphological or molecular methods. Research on parasitic protozoa in environmental samples is scarce due to the lack of an appropriate methodology and low concentrations of parasites. For these reasons, there is a paucity of validated methods for Sarcocystis identification from environmental samples. Therefore, the present study aims to investigate various molecular methods for Sarcocystis parasite identification in water samples. In the present study, the sample volume, sporocysts isolation, and various conventional PCR were evaluated, and species-specific primers for the identification of different Sarcocystis species have been developed. Of the methods studied, based on data the most appropriate method for the identification of analyzed Sarcocystis spp. in water bodies is nested PCR, using species-specific primers targeting the cox1 gene. Sarcocystis DNA was detected in 111 out of 114 (97.4%) samples. This paper represents the first identification of S. bovifelis, S. cruzi, S. hirsuta, S. arieticanis, S. tenella, S. capracanis, S. bertrami, and S. miescheriana by PCR and sequencing in environmental water samples. Our pilot study is useful in developing techniques for the identification of Sarcocystis species from water samples.
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Guzmán Barragán BL, de Souza Lauretto M, Razzolini MTP, Nardocci AC, Marimón Sibaja KV. Assessment microbial risks for the presence of Cryptosporidium spp. and Giardia spp. based on the surveillance of the water supply systems in Colombia, 2014-2018. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2022; 94:e10776. [PMID: 35978464 DOI: 10.1002/wer.10776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 07/19/2022] [Accepted: 07/26/2022] [Indexed: 06/15/2023]
Abstract
Cryptosporidium spp. and Giardia spp. cause gastrointestinal diseases of zoonotic origin as well transmitted from person to person, being various reported outbreaks associated with water. The infecting (oo)cyst forms of these parasites are highly resistant to water treatments such as chlorine disinfection and fast filtration. The objective of this study was to assess the microbial risk of infection and symptomatic illness by the ingestion of Giardia spp. and Cryptosporidium spp. in water for human consumption in Colombia, based on the results of water quality surveillance. The detection method was according to the USEPA method 1623. Concentration data of the different points of distribution were grouped according to the pathogen and type of treatment (no treatment; chlorine treatment; chlorine treatment + coagulant). Annual microbial risks of infection and symptomatic diseases were estimated using the quantitative microbial risk assessment approach that included parasite concentrations, the dose-response model, the ingestion rates of water by children and adults, and the morbidity rate of the diseases. The mean annual microbial risk of infection for Giardia spp. was 29.8% for treated water and 50.4% for untreated water, while being 6.0% and 17.7%, respectively, for Cryptosporidium spp. Microbial risk of symptomatic illness for Giardia spp, was 8.2% for treated water and 13.9% for untreated water, while being 3.6% and 10.6%, respectively, for Cryptosporidium spp. The estimated annual microbial risks of infection exceeded the acceptable value of 10-4 (0.01%) recommended by USEPA. Results obtained in this study suggest the need to reduce the microbial risk of infection to protozoan parasites by improving the water treatment, by adopting better handling practices for livestock manure and treatment processes of human feces. PRACTITIONER POINTS: The presence of Cryptosporidium spp was identified in 28 (6.2%) samples and Giardia spp in 29 (6.4%) in water for human consumption in Colombia. The mean annual risk of symptomatic illness due to infection by Giardia spp or Cryptosporidium spp ranges from 33.6%, for treated water, to 58.1%, for untreated water. Annual risks ingestion of protozoa studying in water for human exceed of 10-4 (0.01%) recommended by USEPA.
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Affiliation(s)
| | - Marcelo de Souza Lauretto
- School of Arts, Science and Humanities,University of São Paulo, São Paulo, Brazil
- NARA - Center for Research in Environmental Risk Assessment, São Paulo, Brazil
| | - Maria Tereza Pepe Razzolini
- NARA - Center for Research in Environmental Risk Assessment, São Paulo, Brazil
- School of Public Health, Universidade of São Paulo, São Paulo, Brazil
| | - Adelaide Cássia Nardocci
- NARA - Center for Research in Environmental Risk Assessment, São Paulo, Brazil
- School of Public Health, Universidade of São Paulo, São Paulo, Brazil
| | - Karen Vanessa Marimón Sibaja
- School of Basic Sciences, Technology and Engineering, National Open and Distance University (UNAD), Ibagué, Tolima, Colombia
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Asghari A, Mahdavi F, Shamsi L, Motazedian MH, Asgari Q, Shahabi S, Mohammadi-Ghalehbin B, Sadrebazzaz A. Prevalence and molecular characterization of Giardia duodenalis in small ruminants of Shiraz, southwestern Iran: A zoonotic concern. Comp Immunol Microbiol Infect Dis 2022; 86:101819. [DOI: 10.1016/j.cimid.2022.101819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/29/2022] [Accepted: 05/09/2022] [Indexed: 10/18/2022]
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Genotypic and Epidemiologic Profiles of Giardia duodenalis in Four Brazilian Biogeographic Regions. Microorganisms 2022; 10:microorganisms10050940. [PMID: 35630389 PMCID: PMC9142931 DOI: 10.3390/microorganisms10050940] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 02/25/2022] [Accepted: 03/28/2022] [Indexed: 02/01/2023] Open
Abstract
Human infections with gut protozoan parasites are neglected and not targeted by specific control initiatives, leading to a knowledge gap concerning their regional diversity and epidemiology. The present study aims to explore Giardia duodenalis genetic diversity and assess the epidemiologic scenario of subclinical infections in different Brazilian biogeographic regions. Cross-sectional surveys (n = 1334 subjects) were conducted in four municipalities in order to obtain fecal samples and socioenvironmental data. Microscopy of non-diarrheal feces and nucleotide sequencing of a β-giardin gene fragment were performed. From a total of 51 samples that could be sequenced, 27 (52.9%) β-giardin sequences were characterized as assemblage A and 24 (47.1%) as assemblage B. In the Amazon, assemblage B was the most frequently detected, predominantly BIII, and with two novel sub-assemblages. Assemblage A predominated in the extra-Amazon region, with five novel sub-assemblages. Prevalence reached 17.8% (64/360) in the Amazon, 8.8% (48/544) in the Atlantic Forest, 7.4% (22/299) in Cerrado and 2.3% (3/131) in the Semiarid. People living in poverty and extreme poverty presented significantly higher positivity rates. In conclusion, subclinical giardiasis is endemic in Brazilian communities in different biogeographic regions, presenting high genetic diversity and a heterogeneous genotypic distribution.
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Krumrie S, Capewell P, Smith-Palmer A, Mellor D, Weir W, Alexander CL. A scoping review of risk factors and transmission routes associated with human giardiasis outbreaks in high-income settings. CURRENT RESEARCH IN PARASITOLOGY & VECTOR-BORNE DISEASES 2022; 2:100084. [PMID: 36589877 PMCID: PMC9795371 DOI: 10.1016/j.crpvbd.2022.100084] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 02/04/2022] [Accepted: 02/16/2022] [Indexed: 01/04/2023]
Abstract
The flagellated pathogen Giardia duodenalis is one of the leading causes of parasitic gastrointestinal illness worldwide. In many higher income countries, such as the United Kingdom, the disease is often perceived as being travel-related, likely leading to the under-reporting of sporadic cases and outbreaks. A summary of the literature describing outbreaks and risk factors in higher income countries is necessary to improve our understanding of this pathogen and identify existing knowledge gaps. Initial literature searches were carried out in September 2016 and updated at regular intervals until November 2021, using appropriate search terms in Medline, Embase and PubMed databases. A total of 75 papers met the inclusion criteria, revealing that the consumption of contaminated water and contact with young children of diaper-wearing age were the most common transmission routes leading to outbreaks of giardiasis. Of the ten studies where food was primarily associated with outbreaks, food handlers accounted for eight of these. Another reported transmission route was direct contact with fecal material, which was reported in six studies as the primary transmission route. Travel-associated giardiasis was considered the sole transmission route in two studies, whereas multiple transmission routes contributed to giardiasis outbreaks in eleven studies. The evidence around zoonotic transmission was less clear and hampered by the lack of robust and regularly applied parasite molecular typing techniques. This literature review summarizes the findings of Giardia outbreak investigations and epidemiological studies in high-income countries. Transmission routes are identified and discussed to highlight the associated risk factors. These data also indicate gaps in our current knowledge that include the need for robust, in-depth molecular studies and have underscored the importance of water as a transmission route for Giardia cysts. These future molecular studies will improve our understanding of Giardia epidemiology and transmission pathways in higher income countries to prevent spread of this significantly under-reported pathogen.
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Affiliation(s)
- Sarah Krumrie
- University of Glasgow School of Veterinary Medicine, 464 Bearsden Road, Glasgow, G61 1QH, UK
- Corresponding author. University of Glasgow School of Veterinary Medicine, 464 Bearsden Road, Glasgow, G61 1QH, UK.
| | - Paul Capewell
- University of Glasgow School of Veterinary Medicine, 464 Bearsden Road, Glasgow, G61 1QH, UK
- BioClavis Ltd, Queen Elizabeth Teaching and Learning Centre, 1345 Govan Road, Glasgow, G51 4TF, UK
| | - Alison Smith-Palmer
- Gastrointestinal and Zoonoses Team, Public Health Scotland, Meridian Court, 5 Cadogan Street, Glasgow, G2 6QE, UK
| | - Dominic Mellor
- University of Glasgow School of Veterinary Medicine, 464 Bearsden Road, Glasgow, G61 1QH, UK
- Gastrointestinal and Zoonoses Team, Public Health Scotland, Meridian Court, 5 Cadogan Street, Glasgow, G2 6QE, UK
| | - Willie Weir
- University of Glasgow School of Veterinary Medicine, 464 Bearsden Road, Glasgow, G61 1QH, UK
| | - Claire L. Alexander
- Scottish Microbiology Reference Laboratories, New Lister Building, 10-16 Alexandria Parade, Glasgow Royal Infirmary, Glasgow, G31 2ER, UK
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Multilocus Genotyping of Giardia duodenalis Occurring in Korean Native Calves. Vet Sci 2021; 8:vetsci8070118. [PMID: 34201724 PMCID: PMC8310109 DOI: 10.3390/vetsci8070118] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/14/2021] [Accepted: 06/21/2021] [Indexed: 12/15/2022] Open
Abstract
Giardia duodenalis is one of the most widely occurring zoonotic protozoan parasites causing diarrheal disease in calves. This study aimed to investigate the prevalence of G. duodenalis in Korean native calves and elucidate the causal factors associated with giardiasis in these animals. We investigated the sequences of three genes (ssu, bg, and gdh) of G. duodenalis in fecal samples collected from 792 Korean native calves during 2019–2020. Data were analyzed with regard to age, sex, sampling season, and the fecal sample type (based on its physical characteristics). The samples were screened for the three genes mentioned above, and 44 samples (5.6%) were G. duodenalis-positive. Polymerase chain reaction results showed a significantly higher prevalence of the infection in calves aged ≥1 month and in those with watery diarrhea in spring season. Screening for the gene sequences ssu (87.5%), bg (96.2%), and gdh (96.7%) revealed that most of the G. duodenalis-positive samples belonged to assemblage E. Four of the G. duodenalis-positive samples belonged to the zoonotic assemblage A. This study highlights the importance of continuous surveillance of genetic mutations in G. duodenalis for the detection of emerging variants of zoonotic G. duodenalis in calves.
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Kumari P, Eo KY, Lee WS, Kimura J, Yamamoto N. DNA-based detection of Leptospira wolffii, Giardia intestinalis and Toxoplasma gondii in environmental feces of wild animals in Korea. J Vet Med Sci 2021; 83:850-854. [PMID: 33775989 PMCID: PMC8182320 DOI: 10.1292/jvms.20-0596] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Leptospira, Giardia intestinalis and Toxoplasma gondii infections are reported in humans and animals
worldwide, but molecular surveillance of these pathogens in Korean wildlife is still limited. Here, we examined the prevalence of these pathogens in
environmental feces of Eurasian otters, leopard cats and raccoon dogs using nested PCR followed by DNA sequencing. G. intestinalis was detected
in all of three animals, while T. gondii was detected only in leopard cats. Leptospira wolffii was detected in raccoon dog and
Eurasian otter. Our results suggest that these animals can act as a reservoir of these zoonotic pathogens. Consistent monitoring of these pathogens in wildlife
is needed to prevent from their infections in humans and livestock in Korea.
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Affiliation(s)
- Priyanka Kumari
- Department of Environmental Health Sciences, Graduate School of Public Health, Seoul National University, Seoul 08826, South Korea.,Institute of Health and Environment, Graduate School of Public Health, Seoul National University, Seoul 08826, South Korea
| | - Kyung Yeon Eo
- Conservation and Research Center, Seoul Zoo, Gwacheon 13829, South Korea
| | - Woo-Shin Lee
- Department of Forest Sciences, College of Agriculture and Life Science, Seoul National University, Seoul 08826, South Korea
| | - Junpei Kimura
- College of Veterinary Medicine, Seoul National University, Seoul 08826, South Korea
| | - Naomichi Yamamoto
- Department of Environmental Health Sciences, Graduate School of Public Health, Seoul National University, Seoul 08826, South Korea.,Institute of Health and Environment, Graduate School of Public Health, Seoul National University, Seoul 08826, South Korea
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Lee H, Jung B, Lim JS, Seo MG, Lee SH, Choi KH, Hwang MH, Kim TH, Kwon OD, Kwak D. Multilocus genotyping of Giardia duodenalis from pigs in Korea. Parasitol Int 2020; 78:102154. [PMID: 32531468 DOI: 10.1016/j.parint.2020.102154] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 05/30/2020] [Accepted: 06/02/2020] [Indexed: 01/21/2023]
Abstract
Giardia duodenalis (syn. G. intestinalis, G. lamblia) is an important zoonotic parasite infecting livestock (including pigs) through ingesting cysts in contaminated food or water. This parasite has been classified into eight different genetic assemblages, A to H. Here, we examined the individual-level prevalence of G. duodenalis in domestic pig farms and confirmed host specificity by genotype comparisons. Samples were collected from southern and central Korea, between May 2017 and January 2019. DNA directly extracted from 745 pig fecal specimens were tested by PCR for G. duodenalis small subunit ribosomal RNA (ssu rRNA), glutamate dehydrogenase (gdh), and β-giardin gene sequences. Based on ssu rRNA PCR, 110 (14.8%) were positive for G. duodenalis. Infection risk was the highest in the fattener group (31/139, 22.3%) and during the autumn season (52/245, 21.2%: p < .001). No statistically significant differences in risk for infection were observed between fecal types (normal versus diarrheal). Fifty ssu rRNA samples, three gdh samples, and five β-giardin samples were successfully sequenced and genotyped. Ssu rRNA assemblage sequence analysis identified E (40.0%, 20/50), D (34.0%, 17/50), C (24.0%, 12/50), and A (2.0%, 1/50). The gdh locus identified three samples as assemblage E, and the β-giardin locus identified four samples as assemblage E and one as assemblage C. Assemblage A sequences obtained (ssu rRNA; MK430919) had 100% identity with Giardia sequences isolated from a Korean individual (AJ293301), indicating the potential of zoonotic transmission. Continuous management and monitoring for prevention of transmission and protection of animal and human health are essential.
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Affiliation(s)
- Haeseung Lee
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - ByeongYeal Jung
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea
| | - Jun-Sik Lim
- College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Min-Goo Seo
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea
| | - Seung-Hun Lee
- College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Kwang-Ho Choi
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea
| | - Mi-Hye Hwang
- Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea
| | - Tae-Hwan Kim
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Oh-Deog Kwon
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Dongmi Kwak
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea; Cardiovascular Research Institute, Kyungpook National University, Daegu 41566, Republic of Korea.
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Géba E, Aubert D, Durand L, Escotte S, La Carbona S, Cazeaux C, Bonnard I, Bastien F, Palos Ladeiro M, Dubey JP, Villena I, Geffard A, Bigot-Clivot A. Use of the bivalve Dreissena polymorpha as a biomonitoring tool to reflect the protozoan load in freshwater bodies. WATER RESEARCH 2020; 170:115297. [PMID: 31756612 DOI: 10.1016/j.watres.2019.115297] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 11/06/2019] [Accepted: 11/08/2019] [Indexed: 06/10/2023]
Abstract
Cryptosporidium parvum, Toxoplasma gondii and Giardia duodenalis are worldwide pathogenic protozoa recognized as major causal agents of waterborne disease outbreaks. To overcome the normative process (ISO 15553/2006) limitations of protozoa detection in aquatic systems, we propose to use the zebra mussel (Dreissena polymorpha), a freshwater bivalve mollusc, as a tool for biomonitoring protozoan contamination. Mussels were exposed to three concentrations of C. parvum oocysts, G. duodenalis cysts or T. gondii oocysts for 21 days followed by 21 days of depuration in clear water. D. polymorpha accumulated protozoa in its tissues and haemolymph. Concerning T. gondii and G. duodenalis, the percentage of protozoa positive mussels reflected the contamination level in water bodies. As for C. parvum detection, oocysts did accumulate in mussel tissues and haemolymph, but in small quantities, and the limit of detection was high (between 50 and 100 oocysts). Low levels of T. gondii (1-5 oocysts/mussel) and G. duodenalis (less than 1 cyst/mussel) were quantified in D. polymorpha tissues. The ability of zebra mussels to reflect contamination by the three protozoa for weeks after the contamination event makes them a good integrative matrix for the biomonitoring of aquatic ecosystems.
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Affiliation(s)
- Elodie Géba
- UMR-I 02 SEBIO (Stress Environnementaux et BIOsurveillance des milieux aquatiques), Université de Reims Champagne Ardenne, UFR Sciences Exactes et Naturelles, Campus Moulin de Housse, BP 1039, 51687, Reims cedex 2, France; EA7510, ESCAPE, EpidémioSurveillance et CirculAtion des Parasites dans les Environnements, Université de Reims Champagne Ardenne, Faculté de Médecine, SFR Cap Santé Fed 4231, 51 Rue Cognacq Jay, 51096, Reims, France
| | - Dominique Aubert
- EA7510, ESCAPE, EpidémioSurveillance et CirculAtion des Parasites dans les Environnements, Université de Reims Champagne Ardenne, Faculté de Médecine, SFR Cap Santé Fed 4231, 51 Rue Cognacq Jay, 51096, Reims, France
| | - Loïc Durand
- ACTALIA Food Safety Department, 310 Rue Popielujko, 50000, Saint-Lô, France
| | - Sandy Escotte
- EA7510, ESCAPE, EpidémioSurveillance et CirculAtion des Parasites dans les Environnements, Université de Reims Champagne Ardenne, Faculté de Médecine, SFR Cap Santé Fed 4231, 51 Rue Cognacq Jay, 51096, Reims, France
| | | | - Catherine Cazeaux
- ACTALIA Food Safety Department, 310 Rue Popielujko, 50000, Saint-Lô, France
| | - Isabelle Bonnard
- UMR-I 02 SEBIO (Stress Environnementaux et BIOsurveillance des milieux aquatiques), Université de Reims Champagne Ardenne, UFR Sciences Exactes et Naturelles, Campus Moulin de Housse, BP 1039, 51687, Reims cedex 2, France
| | - Fanny Bastien
- UMR-I 02 SEBIO (Stress Environnementaux et BIOsurveillance des milieux aquatiques), Université de Reims Champagne Ardenne, UFR Sciences Exactes et Naturelles, Campus Moulin de Housse, BP 1039, 51687, Reims cedex 2, France
| | - Mélissa Palos Ladeiro
- UMR-I 02 SEBIO (Stress Environnementaux et BIOsurveillance des milieux aquatiques), Université de Reims Champagne Ardenne, UFR Sciences Exactes et Naturelles, Campus Moulin de Housse, BP 1039, 51687, Reims cedex 2, France
| | - Jitender P Dubey
- United States Department Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Animal Parasitic Diseases Laboratory, building 1001, Beltsville, MD, 20705-2350, USA
| | - Isabelle Villena
- EA7510, ESCAPE, EpidémioSurveillance et CirculAtion des Parasites dans les Environnements, Université de Reims Champagne Ardenne, Faculté de Médecine, SFR Cap Santé Fed 4231, 51 Rue Cognacq Jay, 51096, Reims, France
| | - Alain Geffard
- UMR-I 02 SEBIO (Stress Environnementaux et BIOsurveillance des milieux aquatiques), Université de Reims Champagne Ardenne, UFR Sciences Exactes et Naturelles, Campus Moulin de Housse, BP 1039, 51687, Reims cedex 2, France
| | - Aurélie Bigot-Clivot
- UMR-I 02 SEBIO (Stress Environnementaux et BIOsurveillance des milieux aquatiques), Université de Reims Champagne Ardenne, UFR Sciences Exactes et Naturelles, Campus Moulin de Housse, BP 1039, 51687, Reims cedex 2, France.
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Kim HY, Lee H, Lee SH, Seo MG, Yi S, Kim JW, Kim CH, Lee YR, So B, Kwon OD, Kwak D. Multilocus genotyping and risk factor analysis of Giardia duodenalis in dogs in Korea. Acta Trop 2019; 199:105113. [PMID: 31356789 DOI: 10.1016/j.actatropica.2019.105113] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 06/12/2019] [Accepted: 07/25/2019] [Indexed: 11/26/2022]
Abstract
Giardia duodenalis (syn. G. intestinalis, G. lamblia), a protozoan parasite that infects most mammals (including humans), has recently been classified into eight different groups/assemblages (A to H) based on host range and genetic characteristics. Assemblages A and B have been reported in humans and in many other animals, including dogs. This study analyzed Giardia infections, implementing multilocus genotyping, including the 18S rRNA, gdh, and β-giardin genes, in sheltered, companion, and special-purpose dogs throughout Korea. Of 640 dog stool samples, 99 (15.5%) were G. duodenalis-positive; this prevalence was similar to that previously reported in Korean calves. In addition, the prevalence was significantly higher in the southern region, and lower in non-sheltered dogs, older dogs, and in the autumn season. Phylogenetic analysis revealed that all G. duodenalis-positive samples belonged to assemblages C and D. Although no G. duodenalis assemblages A and B (mainly found in humans) were identified in this study, assemblage C was detected in the main types of dogs in contact with humans. Assemblage C, thought to be dog-specific, was recently identified in humans. As Giardia (including zoonotic assemblages) is distributed throughout Korea, dog living environments and the potential for dog-human transmission should be monitored.
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Ma DW, Lee MR, Hong SH, Cho SH, Lee SE. Molecular Prevalence and Genotypes of Cryptosporidium parvum and Giardia duodenalis in Patients with Acute Diarrhea in Korea, 2013-2016. THE KOREAN JOURNAL OF PARASITOLOGY 2019; 57:531-536. [PMID: 31715696 PMCID: PMC6851252 DOI: 10.3347/kjp.2019.57.5.531] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 09/09/2019] [Indexed: 01/24/2023]
Abstract
Cryptosporidium parvum and Giardia duodenalis are the main diarrhea-causing parasitic pathogens; however, their prevalence in Korea is unknown. Here, we conducted a survey to determine the prevalence and genotype distribution of these 2 pathogens causing acute diarrhea in 8,571 patients hospitalized in 17 Regional Institute of Health Environment sites in Korea, during 2013–2016. C. parvum and G. duodenalis were detected and genotyped by nested PCR, and the isolate were molecularly characterized by sequencing the glycoprotein 60 (Gp60) and β-giardin genes, respectively. The overall prevalence of C. parvum and G. duodenalis was 0.37% (n=32) and 0.55% (n=47), respectively, and both pathogens were more prevalent in children under 9 years old. Molecular epidemiological analysis showed that the C. parvum isolates belonged to the IIa family and were subtyped as IIaA13G2R1, IIaA14G2R1, IIaA15G2R1, and IIaA18G3R1. Analysis of the β-giardin gene fragment from G. duodenalis showed that all positive strains belong to assemblage A. This is the first report on the molecular epidemiology and subtyping of C. parvum and G. duodenalis in such a large number of diarrheal patients in Korea. These results highlight the need for continuous monitoring of these zoonotic pathogens and provide a basis for implementing control and prevention strategies. Further, the results might be useful for epidemiological investigation of the source of outbreak.
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Affiliation(s)
- Da-Won Ma
- Division of Vectors and Parasitic Diseases, Centers for Disease Control and Prevention, Osong 28159, Korea
| | - Myoung-Ro Lee
- Division of Vectors and Parasitic Diseases, Centers for Disease Control and Prevention, Osong 28159, Korea
| | - Sung-Hee Hong
- Division of Vectors and Parasitic Diseases, Centers for Disease Control and Prevention, Osong 28159, Korea
| | - Shin-Hyeong Cho
- Division of Vectors and Parasitic Diseases, Centers for Disease Control and Prevention, Osong 28159, Korea
| | - Sang-Eun Lee
- Division of Vectors and Parasitic Diseases, Centers for Disease Control and Prevention, Osong 28159, Korea
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Ferreira FP, Caldart ET, Freire RL, Mitsuka-Breganó R, Freitas FMD, Miura AC, Mareze M, Martins FDC, Urbano MR, Seifert AL, Navarro IT. The effect of water source and soil supplementation on parasite contamination in organic vegetable gardens. ACTA ACUST UNITED AC 2018; 27:327-337. [PMID: 30183998 DOI: 10.1590/s1984-296120180050] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 06/12/2018] [Indexed: 11/22/2022]
Abstract
The objective of this study was to determine factors associated with vegetable contamination with zoonotic protozoan. Samples of water, soil and vegetables were collected from July/2014 to May/2016, totaling 83 samples, 21 properties of Londrina region, Paraná, Brazil. DNA amplification of Toxoplasma gondii, Cryptosporidium spp. and Giardia intestinalis in the samples was conducted using polymerase chain reaction (PCR). The PCR results were positive for T. gondii in 12.9% (8/62), Cryptosporidium spp. in 11.3% (7/62) and G. intestinalis in 25.8% (16/62) of the samples. DNA sequencing identified C. parvum in five samples and G. intestinalis Assemblage E in three. The statistical associations demonstrated greater probability of positive samples for T. gondii and for at least one of the three protozoa when the source of irrigation water was the river; a greater chance of positive samples for Cryptosporidium spp. when deer were present on the property; and a smaller chance of positive samples for at least one of the three etiologic agents when soil was supplemented with limestone. The results expose some critical contamination points, providing support for training farmers on good management practices during the production process.
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Affiliation(s)
- Fernanda Pinto Ferreira
- Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina - UEL, Londrina, PR, Brasil
| | - Eloiza Teles Caldart
- Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina - UEL, Londrina, PR, Brasil
| | - Roberta Lemos Freire
- Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina - UEL, Londrina, PR, Brasil
| | - Regina Mitsuka-Breganó
- Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina - UEL, Londrina, PR, Brasil
| | | | - Ana Carolina Miura
- Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina - UEL, Londrina, PR, Brasil
| | - Marcelle Mareze
- Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina - UEL, Londrina, PR, Brasil
| | | | - Mariana Ragassi Urbano
- Departamento de Estatística, Universidade Estadual de Londrina - UEL, Londrina, PR, Brasil
| | - Adilson Luiz Seifert
- Departamento de Agronomia, Universidade Estadual de Londrina - UEL, Londrina, PR, Brasil
| | - Italmar Teodorico Navarro
- Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina - UEL, Londrina, PR, Brasil
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Lee YJ, Han DG, Ryu JH, Chae JB, Chae JS, Yu DH, Park J, Park BK, Kim HC, Choi KS. Identification of zoonotic Giardia duodenalis in Korean native calves with normal feces. Parasitol Res 2018; 117:1969-1973. [PMID: 29654361 DOI: 10.1007/s00436-018-5863-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 04/04/2018] [Indexed: 02/04/2023]
Abstract
Giardia duodenalis is an important zoonotic protozoan parasite that infects humans and other animals. This study was conducted to investigate the prevalence and molecular characterization of G. duodenalis infection in the feces of normal and diarrheic pre-weaned calves aged 1-60 days. Fecal samples were collected from 90 Korean native calves in 7 different regions in the central region of the Republic of Korea (ROK). Of the 90 fecal samples, 9 (10%, 9/90) were positive for G. duodenalis by PCR using the β-giardin gene. Phylogenetic analysis identified G. duodenalis assemblages A and E in the farms examined and G. duodenalis with both assemblage A and E was detected in one farm. Assemblage A was detected in calves with normal feces, while assemblage E was frequently identified in calves with diarrhea. This is the first report of the identification of assemblage A in pre-weaned calves with normal feces in the ROK. These results suggest that G. duodenalis infection is closely associated with calf age and management systems including overcrowding, age-mixed grouping, and hygiene. Thus, giardiasis in calves is an important disease because of its zoonotic significance and should be screened in young animals. Further studies are necessary to elucidate the transmission routes of zoonotic G. duodenalis assemblages.
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Affiliation(s)
- Yoon-Joo Lee
- Department of Animal Science and Biotechnology, College of Ecology and Environmental Science, Kyungpook National University, Sangju, 37224, Republic of Korea
| | - Du-Gyeong Han
- Department of Animal Science and Biotechnology, College of Ecology and Environmental Science, Kyungpook National University, Sangju, 37224, Republic of Korea
| | - Ji-Hyoung Ryu
- Department of Animal Science and Biotechnology, College of Ecology and Environmental Science, Kyungpook National University, Sangju, 37224, Republic of Korea
| | - Jeong-Byoung Chae
- Laboratory of Veterinary Internal Medicine, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, 08826, Republic of Korea
| | - Joon-Seok Chae
- Laboratory of Veterinary Internal Medicine, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, 08826, Republic of Korea
| | - Do-Hyeon Yu
- Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University, Jinju, 52825, Republic of Korea
| | - Jinho Park
- College of Veterinary Medicine, Chonbuk National University, Iksan, 54596, Republic of Korea
| | - Bae-Keun Park
- College of Veterinary Medicine, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Hyeon-Cheol Kim
- College of Veterinary Medicine, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Kyoung-Seong Choi
- Department of Animal Science and Biotechnology, College of Ecology and Environmental Science, Kyungpook National University, Sangju, 37224, Republic of Korea.
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Efstratiou A, Ongerth JE, Karanis P. Waterborne transmission of protozoan parasites: Review of worldwide outbreaks - An update 2011-2016. WATER RESEARCH 2017; 114:14-22. [PMID: 28214721 DOI: 10.1016/j.watres.2017.01.036] [Citation(s) in RCA: 345] [Impact Index Per Article: 49.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 01/18/2017] [Accepted: 01/19/2017] [Indexed: 06/06/2023]
Abstract
This review provides a comprehensive update of worldwide waterborne parasitic protozoan outbreaks that occurred with reports published since previous reviews largely between January 2011 and December 2016. At least 381 outbreaks attributed to waterborne transmission of parasitic protozoa were documented during this time period. The nearly half (49%) of reports occurred in New Zealand, 41% of the outbreaks in North America and 9% in Europe. The most common etiological agent was Cryptosporidium spp., reported in 63% (239) of the outbreaks, while Giardia spp. was mentioned in 37% (142). No outbreaks attributed to other parasitic protozoa were reported. The distribution of reported outbreaks does not correspond to more broadly available epidemiological data or general knowledge of water and environmental conditions in the reporting countries. Noticeably, developing countries that are probably most affected by such waterborne disease outbreaks still lack reliable surveillance systems, and an international standardization of surveillance and reporting systems has yet to be established.
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Affiliation(s)
- Artemis Efstratiou
- State Key Laboratory of Plateau Ecology and Agriculture, Center for Biomedicine and Infectious Diseases, Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining, Qinghai 810016, PR China; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
| | - Jerry E Ongerth
- State Key Laboratory of Plateau Ecology and Agriculture, Center for Biomedicine and Infectious Diseases, Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining, Qinghai 810016, PR China; Civil, Mining, & Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Panagiotis Karanis
- State Key Laboratory of Plateau Ecology and Agriculture, Center for Biomedicine and Infectious Diseases, Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining, Qinghai 810016, PR China.
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Lee SH, VanBik D, Kim HY, Cho A, Kim JW, Byun JW, Oem JK, Oh SI, Kwak D. Prevalence and molecular characterisation of Giardia duodenalis in calves with diarrhoea. Vet Rec 2016; 178:633. [PMID: 27162285 DOI: 10.1136/vr.103534] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/18/2016] [Indexed: 11/04/2022]
Abstract
The aim of this study was to investigate the prevalence of Giardia duodenalis in diarrhoeal faeces from calves that were reared in Korea using PCR and ELISA. Diarrhoeal faecal samples were collected from 590 calves (<3 months old) throughout the country from November 2013 through March 2015. Data were analysed according to the region of collection, season, and type of diarrhoea. Of the 590 collected faecal samples, 77 (13.1 per cent) and 78 (13.2 per cent; true prevalence 9.1 per cent) tested positive by PCR and ELISA, respectively. The results from both testing methods were in agreement in 501 (84.9 per cent) samples, with a κ value of 0.34, which suggests fair agreement. The PCR results showed a higher prevalence in summer and in cases of haemorrhagic diarrhoea (P<0.05), while the ELISA results showed a lower prevalence in cases of pasty diarrhoea (P<0.05). Phylogenetic analysis of the β-giardin gene sequences of G duodenalis showed that the sequences detected in this study belonged to assemblage E, which is specific to cattle and livestock. The higher prevalence of giardiasis in calves with haemorrhagic diarrhoea found in this study differed from previous studies. Therefore, researchers and veterinarians should be aware of the possible involvement of giardiasis in haemorrhagic diarrhoea.
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Affiliation(s)
- S H Lee
- College of Veterinary Medicine, Kyungpook National University, Buk-gu, Daegu 41566, Korea
| | - D VanBik
- College of Veterinary Medicine, Kyungpook National University, Buk-gu, Daegu 41566, Korea
| | - H Y Kim
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk 39660, Korea
| | - A Cho
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk 39660, Korea
| | - J W Kim
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk 39660, Korea
| | - J W Byun
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk 39660, Korea
| | - J K Oem
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk 39660, Korea
| | - S I Oh
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk 39660, Korea
| | - D Kwak
- College of Veterinary Medicine, Kyungpook National University, Buk-gu, Daegu 41566, Korea
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Almeida JC, Martins FDC, Ferreira Neto JM, Santos MMD, Garcia JL, Navarro IT, Kuroda EK, Freire RL. Occurrence of Cryptosporidium spp. and Giardia spp. in a public water-treatment system, Paraná, Southern Brazil. REVISTA BRASILEIRA DE PARASITOLOGIA VETERINARIA 2015; 24:303-8. [DOI: 10.1590/s1984-29612015051] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The purpose of this study was to investigate the occurrence of Cryptosporidium spp. and Giardia spp. in a public water-treatment system. Samples of raw and treated water were collected and concentrated using the membrane filtration technique. Direct Immunofluorescence Test was performed on the samples. DNA extraction using a commercial kit was performed and the DNA extracted was submitted to a nested-PCR reaction (n-PCR) and sequencing. In the immunofluorescence, 2/24 (8.33%) samples of raw water were positive for Giardia spp.. In n-PCR and sequencing, 2/24 (8.33%) samples of raw water were positive for Giardia spp., and 2/24 (8.33%) samples were positive for Cryptosporidium spp.. The sequencing showed Cryptosporidium parvum and Giardia duodenalis DNA. In raw water, there was moderate correlation among turbidity, color and Cryptosporidium spp. and between turbidity and Giardia spp.. The presence of these protozoans in the water indicates the need for monitoring for water-treatment companies.
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Mendes Silva D, Domingues L. On the track for an efficient detection of Escherichia coli in water: A review on PCR-based methods. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2015; 113:400-11. [PMID: 25540852 DOI: 10.1016/j.ecoenv.2014.12.015] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 12/03/2014] [Accepted: 12/08/2014] [Indexed: 05/11/2023]
Abstract
Ensuring water safety is an ongoing challenge to public health providers. Assessing the presence of fecal contamination indicators in water is essential to protect public health from diseases caused by waterborne pathogens. For this purpose, the bacteria Escherichia coli has been used as the most reliable indicator of fecal contamination in water. The methods currently in use for monitoring the microbiological safety of water are based on culturing the microorganisms. However, these methods are not the desirable solution to prevent outbreaks as they provide the results with a considerable delay, lacking on specificity and sensitivity. Moreover, viable but non-culturable microorganisms, which may be present as a result of environmental stress or water treatment processes, are not detected by culture-based methods and, thus, may result in false-negative assessments of E. coli in water samples. These limitations may place public health at significant risk, leading to substantial monetary losses in health care and, additionally, in costs related with a reduced productivity in the area affected by the outbreak, and in costs supported by the water quality control departments involved. Molecular methods, particularly polymerase chain reaction-based methods, have been studied as an alternative technology to overcome the current limitations, as they offer the possibility to reduce the assay time, to improve the detection sensitivity and specificity, and to identify multiple targets and pathogens, including new or emerging strains. The variety of techniques and applications available for PCR-based methods has increased considerably and the costs involved have been substantially reduced, which together have contributed to the potential standardization of these techniques. However, they still require further refinement in order to be standardized and applied to the variety of environmental waters and their specific characteristics. The PCR-based methods under development for monitoring the presence of E. coli in water are here discussed. Special emphasis is given to methodologies that avoid pre-enrichment during the water sample preparation process so that the assay time is reduced and the required legislated sensitivity is achieved. The advantages and limitations of these methods are also reviewed, contributing to a more comprehensive overview toward a more conscious research in identifying E. coli in water.
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Affiliation(s)
- Diana Mendes Silva
- CEB-Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal.
| | - Lucília Domingues
- CEB-Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal.
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Torabi Z, Niksirat A, Mazloomzadeh S, Ahmadiafshar A. Consistency of direct microscopic examination and ELISA in detection of Giardia in stool specimen among children. ASIAN PACIFIC JOURNAL OF TROPICAL DISEASE 2014. [DOI: 10.1016/s2222-1808(14)60715-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zhao Z, Dong H, Wang R, Zhao W, Chen G, Li S, Qi M, Zhang S, Jian F, Zhao J, Zhang L, Wang H, Liu A. Genotyping and subtyping Cryptosporidium parvum and Giardia duodenalis carried by flies on dairy farms in Henan, China. Parasit Vectors 2014; 7:190. [PMID: 24742088 PMCID: PMC4005625 DOI: 10.1186/1756-3305-7-190] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Accepted: 04/06/2014] [Indexed: 11/24/2022] Open
Abstract
Background Cryptosporidium and Giardia are important causes of diarrhea diseases in humans and animals worldwide, and both of them are transmitted by the fecal–oral route, either by direct contact or by the ingestion of contaminated food or water. The role of flies in the mechanical transmission of Cryptosporidium and Giardia has been receiving increasing attention. To date, no information is available in China about the occurrence of Cryptosporidium and Giardia in flies. We here investigated Cryptosporidium and Giardia in flies on dairy farms in Henan Province, China, at the genotype and subtype levels. Methods Eight hundred flies were randomly collected from two dairy farms from July 2010 to September 2010 and were divided evenly into 40 batches. The fly samples were screened for the presence of Cryptosporidium and Giardia with nested PCR. Cryptosporidium was genotyped and subtyped by analyzing the DNA sequences of small subunit rRNA (SSU rRNA) and 60-kDa glycoprotein (gp60) genes, respectively. The identity of Giardia was determined by sequence analyzing of the triosephosphate isomerase (tpi), glutamate dehydrogenase (gdh), and β-giardin (bg) genes. Results Forty batches of flies had 10% of contamination with Cryptosporidium or Giardia, with a mixed infection of the two parasites in one batch of flies. The Cryptosporidium isolates were identified as C. parvum at the SSU rRNA locus, and all belonged to subtype IIdA19G1 at the gp60 locus. The Giardia isolates were all identified as assemblage E of G. duodenalis at the tpi, gdh, and bg loci. One novel subtype of assemblage E was identified based on the gdh and bg loci. Conclusions This is the first molecular study of Cryptosporidium and Giardia in flies identified at both genotype and subtype levels. SSU rRNA and gp60 sequences of C. parvum in flies was 100% homologous with those derived from humans, suggesting flies act as an epidemiological vector of zoonotic cryptosporidiosis. The variable PCR efficiencies observed in the analysis of Giardia at different loci suggest that we should use the multilocus genotyping tool in future studies to increase the detection rate, and importantly, to obtain more complete genetic information on Giardia isolates.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Longxian Zhang
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, PR China.
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