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Boutahar M, Belaouni M, Ibrahimi A, Eljaoudi R, Aanniz T, Er-Rami M, Köster PC, Dashti A, Carmena D. Unveiling Blastocystis epidemiology in Morocco: subtype diversity among clinical patients with and without gastrointestinal manifestations in the Meknes region. Parasitol Res 2024; 123:273. [PMID: 39017986 DOI: 10.1007/s00436-024-08288-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2024] [Accepted: 07/06/2024] [Indexed: 07/18/2024]
Abstract
Blastocystis is an intestinal protist frequently identified in humans and other animals, though its clinical significance remains controversial. This study aimed to determine the prevalence and genetic diversity of Blastocystis in faecal samples from symptomatic (n = 55) and asymptomatic (n = 50) individuals seeking medical care in Meknes, Morocco. Detection of the protist was accomplished through coproparasitological examination and culture in Jones medium. Culture-positive samples were subjected to molecular analyses (PCR and Sanger sequencing) based on sequences of the small subunit ribosomal RNA gene. Epidemiological questionnaires on demographics and potential risk factors were collected from participating patients. The overall Blastocystis infection rate was 51.4% (54/105), with no differences between symptomatic (52.7%, 29/55) and asymptomatic (50.0%, 25/50) individuals. Sequence analyses identified three Blastocystis subtypes, with ST3 being the most prevalent (42.0%), followed by ST1 (34.0%), and ST2 (12.0%). Regarding intra-subtype diversity, allele 4 was found within ST1; alleles 11/12 and alleles 34/36 (alone or in combination) were identified within ST2 and ST3 respectively. Allele 34 in ST3 (40.8%) and allele 4 in ST1 (34.7%) were the most common genetic variants circulating in the surveyed clinical population. A statistically significant association between ST2 and the presence of flatulence was observed. This is the first study assessing the epidemiology and genetic diversity of Blastocystis sp. in the Meknes region, Morocco.
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Affiliation(s)
- Mounia Boutahar
- Human Pathology, Biomedicine and Environment Laboratory, Faculty of Science and Technology of Fez, B.P. 2202 - Route d'Imouzzer, Fez, Morocco.
| | - Mourad Belaouni
- Parasitology-Mycology Laboratory, Moulay Ismaïl Military Hospital, Meknes, Morocco
| | - Azeddine Ibrahimi
- Biotechnology Lab (MedBiotech), Bioinova Research Center, Rabat Medical & Pharmacy School, Mohammed V University in Rabat, 10100, Rabat, Morocco
- Mohammed VI Center for Research & Innovation (CM6), 10000, Rabat, Morocco
- Mohammed VI University of Health Sciences, 20000, Casablanca, Morocco
| | - Rachid Eljaoudi
- Biotechnology Lab (MedBiotech), Bioinova Research Center, Rabat Medical & Pharmacy School, Mohammed V University in Rabat, 10100, Rabat, Morocco
- Mohammed VI Center for Research & Innovation (CM6), 10000, Rabat, Morocco
- Emergency Department, Military Hospital Mohammed V, 10000, Rabat, Morocco
| | - Tarik Aanniz
- Biotechnology Lab (MedBiotech), Bioinova Research Center, Rabat Medical & Pharmacy School, Mohammed V University in Rabat, 10100, Rabat, Morocco
| | - Mohammed Er-Rami
- Parasitology-Mycology Laboratory, Moulay Ismaïl Military Hospital, Meknes, Morocco
- Human Pathology, Biomedicine and Environment Laboratory, Faculty of Medicine and Pharmacy, Fez, Morocco
| | - Pamela C Köster
- Reference and Research Laboratory, National Centre for Microbiology, Majadahonda, Madrid, Spain
- Faculty of Health Sciences, Alfonso X El Sabio University (UAX), Villanueva de La Cañada, Madrid, Spain
- Faculty of Medicine, Alfonso X El Sabio University (UAX), Villanueva de La Cañada, Madrid, Spain
| | - Alejandro Dashti
- Reference and Research Laboratory, National Centre for Microbiology, Majadahonda, Madrid, Spain
| | - David Carmena
- Reference and Research Laboratory, National Centre for Microbiology, Majadahonda, Madrid, Spain
- CIBER Infectious Diseases (CIBERINFEC), Madrid, Spain
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Matovelle C, Quílez J, Tejedor MT, Beltrán A, Chueca P, Monteagudo LV. Subtype Distribution of Blastocystis spp. in Patients with Gastrointestinal Symptoms in Northern Spain. Microorganisms 2024; 12:1084. [PMID: 38930466 PMCID: PMC11205523 DOI: 10.3390/microorganisms12061084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2024] [Revised: 05/24/2024] [Accepted: 05/25/2024] [Indexed: 06/28/2024] Open
Abstract
Limited molecular data exist on the prevalence and subtype distribution of Blastocystis spp., the most prevalent parasite in human and animal feces worldwide. A total of 44 different subtypes (STs) of Blastocystis are currently recognized based on the sequence of the small subunit ribosomal RNA (SSU-rRNA) gene. This is a molecular study of Blastocystis spp. in hospitalized patients with gastrointestinal symptoms in northern Spain. We analyzed 173 Blastocystis-positive patients with gastrointestinal symptoms by using nested PCR for molecular detection, subtype identification, phylogenetic analyses, and genetic diversity assessment. ST2 (34.1%) and ST3 (34.7%) predominated, followed by ST1 (15.6%) and ST4 (15.6%). Mixed infections with different subtypes were observed in some patients. Sequence analysis revealed for the first time in European humans the allele 88 (a variant of ST1). In other cases, alleles commonly found in animal samples were detected (allele 9 in ST2, allele 34 in ST3, and allele 42 in ST4). Phylogenetic analysis showed high variability in ST1 and ST2, suggesting a polyphyletic origin, while both ST3 and ST4 exhibited higher genetic homogeneity, indicating a possible monophyletic origin and recent transmission to humans. These data confirm Blastocystis spp. subtype diversity and may help in understanding the evolutionary processes and potential zoonotic transmission of this parasite.
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Affiliation(s)
- Cristina Matovelle
- Faculty of Medicine, University of Zaragoza, 50009 Zaragoza, Spain;
- Environmental Sciences Institute (IUCA), University of Zaragoza, 50009 Zaragoza, Spain;
| | - Joaquín Quílez
- AgriFood Institute of Aragon (IA2), 50013 Zaragoza, Spain;
- Department of Animal Pathology, Faculty of Veterinary Sciences, University of Zaragoza, 50013 Zaragoza, Spain
| | - María Teresa Tejedor
- Department of Anatomy, Embryology and Animal Genetics, Faculty of Veterinary Sciences, University of Zaragoza, 50013 Zaragoza, Spain; (M.T.T.); (P.C.)
- Aragon Institute of Health Sciences (IACS), Centro de Investigación Biomédica en Red-Enfermedades Cardiovasculares (CIBERCV), 50009 Zaragoza, Spain
| | - Antonio Beltrán
- Environmental Sciences Institute (IUCA), University of Zaragoza, 50009 Zaragoza, Spain;
- Service of Microbiology and Parasitology, Hospital Clínico Universitario Lozano Blesa, 50009 Zaragoza, Spain
| | - Patricia Chueca
- Department of Anatomy, Embryology and Animal Genetics, Faculty of Veterinary Sciences, University of Zaragoza, 50013 Zaragoza, Spain; (M.T.T.); (P.C.)
| | - Luis Vicente Monteagudo
- AgriFood Institute of Aragon (IA2), 50013 Zaragoza, Spain;
- Department of Anatomy, Embryology and Animal Genetics, Faculty of Veterinary Sciences, University of Zaragoza, 50013 Zaragoza, Spain; (M.T.T.); (P.C.)
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Adao DEV, Rivera WL. Subtype-host patterns and genetic differentiation of Blastocystis sp. in the Philippines. Heliyon 2024; 10:e29019. [PMID: 38601700 PMCID: PMC11004820 DOI: 10.1016/j.heliyon.2024.e29019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 03/27/2024] [Accepted: 03/28/2024] [Indexed: 04/12/2024] Open
Abstract
Blastocystis sp. is a gastrointestinal protozoan commonly encountered in humans and animals. Specificity to certain hosts may be associated with 38 known subtypes (STs) and 8 nonmammalian and avian STs (NMASTs). This can be determined by analyzing ST-host associations, ST-allele data, genetic variability analyses, and fixation index (FST) with sufficient data present. Thus, newly acquired and previously published data on Blastocystis sp. STs and NMASTs from the Philippines were compiled to determine the following: (1) ST-host associations, (2) ST-allele diversity per ST in certain hosts/sources, (3) intrasubtype diversity of certain STs found in different hosts using genetic variability analysis, and (4) comparison of similarities between specific ST populations to determine if these are the same circulating populations using FST. A total of 448 samples subtyped using both sequence-tagged site primers and the 600-bp barcoding region of the Blastocystis sp. SSU rRNA gene were analyzed in this study. Patterns of association for the Philippine samples were similar to those from neighboring Southeast Asian countries and around the world: ST1-ST4 were found in humans but ST3 was the most common, ST5 were found in pigs, and ST6 and ST7 were found in poultry. Blastocystis sp. from humans are mostly the same ST alleles (ST3 allele 34 and ST1 allele 4) while 3-5 ST alleles were found in the most common STs in pigs, macaques, and poultry. Also, ST1, ST3, ST5, and NMAST I are undergoing population expansion according to genetic variability analyses through possible addition of new alleles based on ST-allele diversity. Moreover, FST shows the same circulating population of ST1 in humans, pigs, and water indicating a possible waterborne route of cross-transmission. In contrast, ST3 found in humans possibly come from the same circulating population and is genetically distinct from those in nonhuman sources.
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Affiliation(s)
- Davin Edric V. Adao
- Pathogen–Host–Environment Interactions Research Laboratory, Institute of Biology, College of Science, University of the Philippines Diliman, Quezon City, 1101, Philippines
| | - Windell L. Rivera
- Pathogen–Host–Environment Interactions Research Laboratory, Institute of Biology, College of Science, University of the Philippines Diliman, Quezon City, 1101, Philippines
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Boutahar M, Belaouni M, Ibrahimi A, Eljaoudi R, Aanniz T, Er-Rami M. Prevalence of Blastocystis sp. in Morocco: Comparative assessment of three diagnostic methods and characterization of parasite forms in Jones' culture medium. Parasite 2023; 30:64. [PMID: 38117274 PMCID: PMC10732137 DOI: 10.1051/parasite/2023065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Accepted: 12/11/2023] [Indexed: 12/21/2023] Open
Abstract
Blastocystosis is an infection caused by Blastocystis sp., which colonizes the digestive tract of various hosts, including humans, although its pathogenicity is debated. It is crucial to detect and distinguish the different forms of Blastocystis to understand better its impact on human health and its epidemiological evolution. This study evaluated three diagnostic methods on 105 stool samples: direct examination, culture in Jones' medium, and conventional PCR. PCR is considered the gold standard and revealed a high prevalence of Blastocystis (67.62%) compared to direct examination (20.95%) and culture in Jones' medium (51.43%). Although the sensitivity of direct examination and culture was 31% and 76.1%, respectively, their specificity was 100%. No significant risk factors were identified. A statistically significant association was observed between Blastocystis infection and abdominal pain. Microscopic analysis revealed various morphological forms. Molecular diagnosis is an essential tool to determine the true prevalence of Blastocystis, and studying the different forms of this microorganism will contribute to a better understanding of its biological cycle and, therefore, the impact of this emerging infection on human health.
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Affiliation(s)
- Mounia Boutahar
- Human Pathology, Biomedicine and Environment Laboratory, Faculty of Science and Technology of Fez, B.P. 2202 - Route d'Imouzzer, Fez, Morocco
| | - Mourad Belaouni
- Parasitology-Mycology Laboratory, Moulay Ismaïl Military Hospital, Meknes 50007, Morocco
| | - Azeddine Ibrahimi
- Biotechnology Lab (MedBiotech), Bioinova Research Center, Rabat Medical & Pharmacy School, Mohammed V University in Rabat, Rabat 10100, Morocco - Mohammed VI Center for Research & Innovation (CM6), Rabat 10000, Morocco - Mohammed VI University of Health Sciences, Casablanca 20000, Morocco
| | - Rachid Eljaoudi
- Biotechnology Lab (MedBiotech), Bioinova Research Center, Rabat Medical & Pharmacy School, Mohammed V University in Rabat, Rabat 10100, Morocco - Mohammed VI Center for Research & Innovation (CM6), Rabat 10000, Morocco - Emergency Department, Military Hospital Mohammed V, Rabat 10000, Morocco
| | - Tarik Aanniz
- Biotechnology Lab (MedBiotech), Bioinova Research Center, Rabat Medical & Pharmacy School, Mohammed V University in Rabat, Rabat 10100, Morocco
| | - Mohammed Er-Rami
- Parasitology-Mycology Laboratory, Moulay Ismaïl Military Hospital, Meknes 50007, Morocco - Human Pathology, Biomedicine and Environment Laboratory, Faculty of Medicine and Pharmacy, Fez 30070, Morocco
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Marangi M, Boughattas S, De Nittis R, Pisanelli D, Delli Carri V, Lipsi MR, La Bella G, Serviddio G, Niglio M, Lo Caputo S, Margaglione M, Arena F. Prevalence and genetic diversity of Blastocystis sp. among autochthonous and immigrant patients in Italy. Microb Pathog 2023; 185:106377. [PMID: 37839760 DOI: 10.1016/j.micpath.2023.106377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 10/01/2023] [Accepted: 10/02/2023] [Indexed: 10/17/2023]
Abstract
The prevalence of Blastocystis sp., its genetic diversity and the distribution of circulating subtypes (STs) were molecularly investigated in a cohort of autochthonous and immigrant patients with gastrointestinal symptoms hospitalized over the period February 2022-June 2023 at the Policlinico Ospedaliero-Universitario "Riuniti", Foggia, in Southern Italy. The population variables, including patient geographical origin, gender and age classes were reported. Out of the 927 investigated patients, 36 (3.9%) were positive for Blastocystis sp. A statistically significant association with African origin and age classes >18 years old was found. ST1 (allele 4), ST2 (alleles 9, 13), ST3 (alleles 34, 36) and ST4 (allele 92) were the subtypes detected with a different distribution between autochthonous and immigrant patients. Co-infections with enteric protozoa such as Giardia duodenalis and Dientamoeba fragilis, pathogenic bacteria as Clostridioides difficile, Campylobacter jejuni and Aeromonas sp. and viral infections such as Norovirus were found in 33% of cases. This is the first study of Blastocystis sp., its circulating subtypes and allele variability among patients with different geographical origin in an area of Southern Italy, in the Central Mediterranean, characterized by high immigrant pressure. These results provide baseline data to better investigate a potential interaction between Blastocystis sp. and other risk factors in patients with gastrointestinal symptoms.
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Affiliation(s)
- Marianna Marangi
- Department of Clinical and Experimental Medicine, University of Foggia, Viale Luigi Pinto, 71122, Foggia, Italy.
| | | | - Rosella De Nittis
- Microbiology and Virology Unit, Ospedali Riuniti, Viale Luigi Pinto, 71122, Foggia, Italy.
| | - Daniela Pisanelli
- Microbiology and Virology Unit, Ospedali Riuniti, Viale Luigi Pinto, 71122, Foggia, Italy.
| | - Valeria Delli Carri
- Microbiology and Virology Unit, Ospedali Riuniti, Viale Luigi Pinto, 71122, Foggia, Italy.
| | - Maria Rosaria Lipsi
- Microbiology and Virology Unit, Ospedali Riuniti, Viale Luigi Pinto, 71122, Foggia, Italy.
| | - Gianfranco La Bella
- Department of Clinical and Experimental Medicine, University of Foggia, Viale Luigi Pinto, 71122, Foggia, Italy; Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Via Manfredonia 20, Foggia, Italy.
| | - Gaetano Serviddio
- Department of Medical and Surgical Sciences, University of Foggia, Viale Luigi Pinto, 71122, Foggia, Italy.
| | - Mariangela Niglio
- Department of Clinical and Experimental Medicine, University of Foggia, Viale Luigi Pinto, 71122, Foggia, Italy.
| | - Sergio Lo Caputo
- Department of Clinical and Experimental Medicine, University of Foggia, Viale Luigi Pinto, 71122, Foggia, Italy.
| | - Maurizio Margaglione
- Department of Clinical and Experimental Medicine, University of Foggia, Viale Luigi Pinto, 71122, Foggia, Italy.
| | - Fabio Arena
- Department of Clinical and Experimental Medicine, University of Foggia, Viale Luigi Pinto, 71122, Foggia, Italy; Microbiology and Virology Unit, Ospedali Riuniti, Viale Luigi Pinto, 71122, Foggia, Italy.
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Hernández PC, Maloney JG, Molokin A, George NS, Morales L, Chaparro-Olaya J, Santin M. Exploring Blastocystis genetic diversity in rural schoolchildren from Colombia using next-generation amplicon sequencing reveals significant associations between contact with animals and infection risk. Parasitol Res 2023:10.1007/s00436-023-07841-3. [PMID: 37156906 DOI: 10.1007/s00436-023-07841-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 04/05/2023] [Indexed: 05/10/2023]
Abstract
Blastocystis is a common intestinal protist with a global distribution in humans and many other animals. Yet, the status of Blastocystis as a pathogen, the risk factors associated with its transmission, and its zoonotic potential remain ill-defined. Here, we explored subtype (ST) diversity and potential risk factors for Blastocystis infection in 98 children from Apulo, Colombia. Samples were screened for Blastocystis via PCR, and ST identification was performed through next-generation amplicon sequencing (NGS). Associations between the presence of Blastocystis and individual STs and sociodemographic variables were assessed via logistic regression analyses. Seventy-one samples (72.4%) were Blastocystis-positive, and NGS revealed the presence of five STs (ST1-ST5). ST1, ST2, and ST3 were common and observed in nearly equal proportions (~ 40%), while samples with ST4 (1.4%) and ST5 (5.6%) were comparatively rare. The presence of mixed STs in the same sample was also common (28.2%). Comparisons among children within the same household identified that shared ST profiles were common, but diversity within family units was also observed. Logistic regression analyses returned significant associations between the presence of Blastocystis, individual subtypes, or mixed subtypes for several variables. Intriguingly, the presence of animals was one of the most common significant associations. Taken together, these data represent an important step forward in understanding both the potential routes and risk factors that may influence Blastocystis transmission and will be useful in shaping future studies which seek to clarify the relationships between STs, pathogenicity, and zoonotic transmission.
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Affiliation(s)
- Paula C Hernández
- Laboratorio de Parasitología Molecular, Vicerrectoría de Investigaciones, Universidad El Bosque, Bogotá, Colombia
| | - Jenny G Maloney
- Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD, 20705, USA
| | - Aleksey Molokin
- Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD, 20705, USA
| | - Nadja S George
- Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD, 20705, USA
| | - Liliana Morales
- Laboratorio de Parasitología Molecular, Vicerrectoría de Investigaciones, Universidad El Bosque, Bogotá, Colombia
| | - Jacqueline Chaparro-Olaya
- Laboratorio de Parasitología Molecular, Vicerrectoría de Investigaciones, Universidad El Bosque, Bogotá, Colombia.
| | - Monica Santin
- Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD, 20705, USA.
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Darwish B, Aboualchamat G, Al Nahhas S. Molecular characterization of Blastocystis subtypes in symptomatic patients from the southern region of Syria. PLoS One 2023; 18:e0283291. [PMID: 36928869 PMCID: PMC10019620 DOI: 10.1371/journal.pone.0283291] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Accepted: 03/03/2023] [Indexed: 03/18/2023] Open
Abstract
Blastocystis sp. is an enteric protist found in humans and a wide range of animal hosts. Genetic variations were established among the 38 different subtypes detected so far, 14 of which are commonly found in human and animal hosts. The aim of the present study is to estimate the prevalence of the common Blastocystis subtypes and evaluate the possible correlation with several variables (gender, age, symptoms, domestic animals…), among patients from the southern region of Syria. Fecal samples were collected from individuals suffering from gastrointestinal complaints. Microscopic examination along with genotype analyses using seven pairs of subtype-specific primers was performed. Our results revealed the presence of Blastocystis sp. in 46 isolates out of the 60 samples microscopically studied (76.7%); single infection was detected in 24 isolates whereas co-infection with other protozoa was identified in 22 ones. Molecular detection targeting the SSU rRNA gene revealed a 100% positive presence of Blastocystis sp. in all the samples. Genotyping results detected the presence of five different subtypes (ST1-ST5) with varying proportions. However, ST1 was the dominant subtype observed (66.7%). Mixed subtype infections were found in 9 isolates (15%). Three samples remained undefined, nonetheless. Our statistical results showed no significant correlation between Blastocystis STs infection and the different studied variables. In conclusion, this study provides the first genetic characterization of Blastocystis subtypes prevalence in patients from the southern region of Syria. ST1 distribution was highly predominant. Further molecular studies are needed to estimate the prevalence of Blastocystis sp. infection in other regions in Syria and to understand the epidemiology and sources of transmission to humans.
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Affiliation(s)
- Buthaina Darwish
- Department of Animal Biology, Faculty of Science, Damascus University, Damascus, Syria
| | - Ghalia Aboualchamat
- Department of Animal Biology, Faculty of Science, Damascus University, Damascus, Syria
| | - Samar Al Nahhas
- Department of Animal Biology, Faculty of Science, Damascus University, Damascus, Syria
- * E-mail: ,
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Bertozzo TV, David ÉB, Oliveira-Arbex AP, Victória C, Guimarães S. Frequency, spatial distribution, and genetic diversity of Blastocystis among referred individuals to a clinical laboratory: First report of subtype 9 in Brazil. Acta Trop 2022; 234:106608. [PMID: 35841954 DOI: 10.1016/j.actatropica.2022.106608] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 06/13/2022] [Accepted: 07/12/2022] [Indexed: 12/17/2022]
Abstract
The enteric protist Blastocystis has a worldwide distribution, however its prevalence in the human population is still underestimated, especially in developing countries where proper diagnosis is not performed in the routine of clinical laboratories. In this study, we aimed to assess the frequency, genetic diversity, and spatial distribution of Blastocystis isolates detected in fecal samples referred to a clinical laboratory for routine examination in inner São Paulo State, Brazil. A total of 348 leftover stool samples available for disposal from female and male individuals with age ranging from 3 months to 88 years were analyzed by both microscopic examination and PCR/sequencing of the SSU rRNA gene. The overall frequency of Blastocystis sp. was 31% (108/348), including 20.1% (70/348) and 31% (108/348) by microscopic examination and PCR/sequencing, respectively. Significant association was found only between Blastocystis infection and age, since the highest rate of positive samples was detected among 5-9 years old individuals (p < 0.0001). In addition, spatial distribution revealed a wide distribution of the positive samples, however they were densely concentrated in more populated areas. Seven subtypes were identified, namely ST1 (40.7%), ST2 (9.2%), ST3 (45.3%), ST4 (0.9%), ST6 (1.8%), ST7 (0.9%) and ST9 (0.9%). The intra-subtype analysis revealed a total of 25 different alleles previously reported. Here, the findings lead us to highlight the following aspects: (1) the identification of a ST9 isolate is a relevant finding since it is considered a very rare subtype in human infections as well as this is the first report in Brazil; (2) the high frequency of Blastocystis in fecal samples submitted for examination in a clinical laboratory points to the need to consider its search in routine parasitological examinations, (3) the spatial distribution of Blastocystis infection was not homogeneous but concentrated in more populated areas where the access for population to diagnostic services in healthcare is likely to be easier and, (4) the genetic variability of Blastocystis isolates suggests exposure of inhabitants living in inner municipalities to different sources of contamination involving anthroponotic and zoonotic transmission pathways.
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Affiliation(s)
- Thainá Valente Bertozzo
- Tropical Diseases Posgraduate Program, Medical School, São Paulo State University (UNESP), Botucatu, SP, Brazil
| | - Érica Boarato David
- Department of Health Sciences, Sacred Heart University Center (UNISAGRADO), Bauru, SP, Brazil
| | | | - Cassiano Victória
- Faculty of Veterinary Medicine and Animal Science, Department of Animal Production and Preventive Veterinary Medicine, São Paulo State University (UNESP), Botucatu, SP, Brazil
| | - Semíramis Guimarães
- Division of Parasitology, Institute of Bioscience, São Paulo State University (UNESP), Campus de Botucatu, PO Box: 510, Botucatu, SP CEP 18618-689, Brazil.
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Ali SH, Ismail MAM, El-Badry AA, Abu-Sarea EY, Dewidar AM, Hamdy DA. An Association Between Blastocystis Subtypes and Colorectal Cancer Patients: A Significant Different Profile from Non-cancer Individuals. Acta Parasitol 2022; 67:752-763. [PMID: 35067864 PMCID: PMC8784229 DOI: 10.1007/s11686-021-00508-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 12/09/2021] [Indexed: 12/21/2022]
Abstract
PURPOSE Blastocystis is a common enteric human parasite of non-conclusive pathogenicity which may be determined by subtype (ST) variation. Colorectal cancer (CRC) is considered one of the primary causes of cancer mortality. Blastocystis ST7 has been shown to reduce beneficial intestinal microbiota and may exacerbate CRC. This study assessed the possible association between Blastocystis STs and CRC in comparison to non-cancer patients. MATERIAL AND METHODS A total of 200 fecal samples were obtained from CRC (100) and non-CRC (100) individuals attending Beni-Suef University Hospital, Egypt. Blastocystis was searched for in all samples using microscopy and culturing. Positive subculture samples were genetically sequenced and subtyped using conventional polymerase chain reaction (PCR). Blastocystis STs were determined by sequencing and a phylogenetic tree was created. Related patient characteristics and tumor stages were analyzed for association with presence of Blastocystis. RESULTS Blastocystis was identified in 52% and 42% of CRC and non-cancer individuals, respectively. ST1, 2, and 3 were isolated from both cancer and non-cancer individuals; however, for the first time, ST7 was only isolated from CRC stool samples with significant association. Associated patient characteristics were evaluated as predictors. CONCLUSION Blastocystosis is highly prevalent in CRC patients, predominantly in the latest CRC grades and stages. To the best of our knowledge, this is the first study to report the identification of Blastocystis ST7 in CRC patients. To determine whether certain STs of Blastocystis are associated with CRC would require further research, including the role played by gut microbiota.
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Affiliation(s)
- Shaimaa H. Ali
- Department of Medical Parasitology, College of Medicine, Beni-Suef University, Beni Suef, Egypt
| | - Mousa A. M. Ismail
- Department of Medical Parasitology, College of Medicine, Cairo University, Giza, Egypt
| | - Ayman A. El-Badry
- Department of Microbiology-Medical Parasitology Section, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Enas Y. Abu-Sarea
- Department of Medical Parasitology, College of Medicine, Beni-Suef University, Beni Suef, Egypt
| | - Ahmad M. Dewidar
- Department of Oncology, College of Medicine, Beni-Suef University, Beni Suef, Egypt
| | - Doaa A. Hamdy
- Department of Medical Parasitology, College of Medicine, Beni-Suef University, Beni Suef, Egypt
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BACHI F, ABIDAT F, GHAFFOR Y, BELLILI S, GOURA S, BELMADANI SA. [Molecular characterization of algerian strains of Blastocysts sp]. MEDECINE TROPICALE ET SANTE INTERNATIONALE 2022; 2:mtsi.v2i1.2022.226. [PMID: 35685839 PMCID: PMC9128492 DOI: 10.48327/mtsi.v2i1.2022.226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 02/23/2022] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Blastocystis sp. is a protozoan that colonizes the gastrointestinal tract of humans and many animals and is currently the most common parasite found in human stools. In some developing countries, its prevalence in study populations may exceed 50%. Morphologically, isolates of Blastocystis sp. found in different hosts are very similar. However, these same isolates show a very high genetic diversity between them and no less than 17 subtypes (or genotypes) have already been identified from molecular data. Genotyping studies have been carried out in many countries around the world and in particular in some Mediterranean countries such as France, spain, Italy, Turkey and Egypt. However, very little genotyping data is available in Algeria. To this end, we conducted the present study to identify and genotype Blastocystis in human and animal stool samples. PATIENTS AND METHODS One thousand eight hundred and sixty-nine (1,869) stool samples from kitchen staff as part of the periodic medical check-up, from subjects for the provision of a medical certificate required for the processing of a visa file and from patients with gastrointestinal disorders were examined. In addition to human faeces, animal samples, including 10 poultry, 2 cattle and 2 murine animals were examined. All stools were subjected to direct microscopic examination supplemented by concentration techniques and modified Ziehl Neelsen staining. Molecular characterization of 39 human and 14 animal isolates was performed by sequencing and the resulting sequences compared with those available from GenBank. Sequencing was only contributory for 30 human and 9 animal strains. RESULTS Of all human samples examined 284 were positive (15.19%) with a prevalence of 7.38% for Blastocystis. Of the 30 strains that were molecularly characterized, ST3 was predominant (15/30, 50%) followed by ST1 (10/30, 33.33%) and in third place ST2 (4/30, 13.33%). ST4 was identified in only one patient (1/30, 3.33%). The correlation between clinical status and the subtype of Blastocystis identified showed that the number of ST3 was high in asymptomatic subjects (11/15, 73%) compared to symptomatic subjects (4/15, 26.66%), as well as for the ST1 subtype (7/10, 70% versus 3/10, 30%). Conversely, the number of ST2 was higher in subjects with gastrointestinal disorders (3/4, 75%). In addition to human strains, we genotyped 7 avian, 2 murine and 2 bovine strains. Characterization of the avian strains revealed 5 ST6 (71.42%) and 2 ST7 (28, 57%). The murine and bovine strains are identified as ST7 and ST6 respectively.
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Affiliation(s)
- Fatma BACHI
- Laboratoire de biologie parasitaire, Département de parasitologie, Institut Pasteur d’Algérie, Route du petit Staouéli, Dely-Brahim, Alger, Algérie,Département de médecine, Faculté de médecine d’Alger, Université d’Alger, Algérie,*
| | - Fayçal ABIDAT
- Laboratoire de biologie parasitaire, Département de parasitologie, Institut Pasteur d’Algérie, Route du petit Staouéli, Dely-Brahim, Alger, Algérie,Département de médecine, Faculté de médecine d’Alger, Université d’Alger, Algérie
| | - Yasmine GHAFFOR
- Laboratoire de biologie parasitaire, Département de parasitologie, Institut Pasteur d’Algérie, Route du petit Staouéli, Dely-Brahim, Alger, Algérie
| | - Sarra BELLILI
- Laboratoire de biologie parasitaire, Département de parasitologie, Institut Pasteur d’Algérie, Route du petit Staouéli, Dely-Brahim, Alger, Algérie
| | - Soumaya GOURA
- Laboratoire de biologie parasitaire, Département de parasitologie, Institut Pasteur d’Algérie, Route du petit Staouéli, Dely-Brahim, Alger, Algérie
| | - Sid Ali BELMADANI
- Laboratoire de biologie parasitaire, Département de parasitologie, Institut Pasteur d’Algérie, Route du petit Staouéli, Dely-Brahim, Alger, Algérie
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Detection, Molecular Identification and Transmission of the Intestinal Protozoa Blastocystis sp. in Guinea from a Large-Scale Epidemiological Study Conducted in the Conakry Area. Microorganisms 2022; 10:microorganisms10020446. [PMID: 35208899 PMCID: PMC8876712 DOI: 10.3390/microorganisms10020446] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 02/08/2022] [Accepted: 02/15/2022] [Indexed: 12/15/2022] Open
Abstract
Blastocystis sp. is a single-celled parasite estimated to colonize the digestive tract of 1 to 2 billion people worldwide. Although it represents the most frequent intestinal protozoa in human stools, it remains still under-investigated in countries with a high risk of infection due to poor sanitary and hygiene conditions, such as in Africa. Therefore, the present study was carried out to determine the prevalence and subtype (ST) distribution of Blastocystis sp. in the Guinean population. For this purpose, fecal samples were collected from 500 individuals presenting or not digestive disorders in two hospitals of Conakry. Search for the parasite in stools was performed by real-time PCR targeting the small subunit rDNA gene followed by sequencing of the PCR products for subtyping of the isolates. A total of 390 participants (78.0%) was positive for Blastocystis sp. Five STs were identified in the Guinean cohort (ST1, ST2, ST3, ST4 and ST14) with varying frequency, ST3 being predominant. Among them, ST4 was found in only two patients confirming its global rarity in Africa whereas infections by ST14 were likely the result of zoonotic transmission from bovid. No significant association was detected between Blastocystis sp. colonization or ST distribution and the symptomatic status of Guinean subjects or the presence of digestive symptoms. In contrast, drilling water consumption represented a significant risk factor for infection by Blastocystis sp. Predominance of ST3 coupled with its low intra-ST diversity strongly suggested large-scale human-to-human transmission of this ST within this cohort. In parallel, the highest intra-ST diversity of ST1 and ST2 was likely correlated with various potential sources of infection in addition to anthroponotic transmission. These findings highlighted the active circulation of the parasite in Guinea as reported in some low-income African countries and the necessity to implement prevention and control measures in order to limit the circulation of this parasite in this endemic geographical area.
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Wakid MH, Aldahhasi WT, Alsulami MN, El-Kady AM, Elshabrawy HA. Identification and Genetic Characterization of Blastocystis Species in Patients from Makkah, Saudi Arabia. Infect Drug Resist 2022; 15:491-501. [PMID: 35360371 PMCID: PMC8963194 DOI: 10.2147/idr.s347220] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 01/12/2022] [Indexed: 11/29/2022] Open
Abstract
Background Blastocystis species (sp.) are gastrointestinal protozoan parasites with high prevalence rates worldwide. Blastocystis sp. show extensive genetic diversity with 17 different subtypes (STs) described to date. A few studies have investigated the prevalence and STs of Blastocystis sp. in Makkah, Saudi Arabia. Therefore, we aimed in this study to identify and characterize subtypes of Blastocystis sp. in the City of Makkah, Saudi Arabia. Methods Stool samples were collected from 140 patients who presented to King Abdulaziz Hospital, Hera General Hospital and Modern Medical Center in Saudi Arabia. Different microscopic examination methods of patients’ stools and molecular analyses (using primers targeting SSU rRNA gene) were performed to identify and characterize STs of Blastocystis sp. Results Our microscopic examination of stool samples showed that 96/140 patients (68.6%) had Blastocystis sp. infection. Clinical examination of infected patients revealed that 81 patients were symptomatic, whereas 15 were asymptomatic. Next, we isolated DNA from Blastocystis sp.-positive stool samples followed by PCR amplification of small-subunit ribosomal RNA (SSU rRNA) gene and sequence analysis. Our sequence analysis showed that subtype 3 (ST3) was the most prevalent (53.13%) followed by subtype 1 (ST1) (45.83%), whereas subtype 2 (ST2) was the least prevalent (1.04%). Moreover, our results showed that all three STs resulted in more symptomatic than asymptomatic cases. Finally, we identified novel haplotypes which comprised of 8 ST3, 6 ST1, and one ST2 haplotypes. Conclusion Our identification of several haplotypes in patients’ stools confirms the genetic diversity of Blastocystis sp. and may explain the reported low host specificity and differential pathogenicity of Blastocystis sp. We believe that additional molecular epidemiological and genomic studies are needed to understand the prevalence and pathogenicity of different subtypes in humans and animal hosts.
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Affiliation(s)
- Majed H Wakid
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
- Special Infectious Agents Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Waad T Aldahhasi
- Department of Biology, College of Science, University of Jeddah, Jeddah, 21493, Saudi Arabia
| | - Muslimah N Alsulami
- Department of Biology, College of Science, University of Jeddah, Jeddah, 21493, Saudi Arabia
| | - Asmaa M El-Kady
- Department of Medical Parasitology, Faculty of Medicine, South Valley University, Qena, 83523, Egypt
- Correspondence: Asmaa M El-Kady; Hatem A Elshabrawy, Email ;
| | - Hatem A Elshabrawy
- Department of Molecular and Cellular Biology, College of Osteopathic Medicine, Sam Houston State University, Conroe, TX, 77304, USA
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Nemati S, Falahati Anbaran M, Mohammad Rahimi H, Hosseini MS, Aghaei S, Khalili N, Mirjalali H, Zali MR. Evolutionary and phylogenetic analyses of the barcoding region suggest geographical relationships among Blastocystis sp., ST3 in humans. INFECTION, GENETICS AND EVOLUTION : JOURNAL OF MOLECULAR EPIDEMIOLOGY AND EVOLUTIONARY GENETICS IN INFECTIOUS DISEASES 2021; 96:105151. [PMID: 34801757 DOI: 10.1016/j.meegid.2021.105151] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 11/11/2021] [Accepted: 11/16/2021] [Indexed: 06/13/2023]
Abstract
Blastocystis sp., has 21 distinct subtypes of which ST3 thought to be the most prevalent subtype. This study aims to analyze the global variations of ST3. In total, 496 sequences with more than 400 nucleotides from Asia, Europe, Africa, and America were included in this study. Results show that allele 34 was the most prevalent allele in all continents. The lowest and highest allele diversity were observed in Europe and Africa, respectively. The nucleotide diversity ranged from 0.0077 in Europe to 0.02 in Africa, and haplotype diversity ranged from 0.461 in America to 0.6 in Africa. The haplotype network and Bayesian structure showed at least two major clusters including Asia and Europe-Africa-America. Tajima's D values for all continents were negative and statistically significant, indicating an excess of rare nucleotide variants. Similarly, the Fu's FS test showed negative values for all regions, indicating an excess of rare haplotypes. Pairwise FST exhibited a high genetic differentiation between Asia and other continents. Mismatch analysis for all populations showed a unimodal distribution. Our findings indicate that there are two probable major clusters of Blastocystis sp. ST3, a cluster which is shared between Europe, Africa, and America, and a cluster which is restricted to Asia.
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Affiliation(s)
- Sara Nemati
- Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohsen Falahati Anbaran
- School of Biology, University of Tehran, 14155-6455 Tehran, Iran; NTNU University Museum, Norwegian University of Science and Technology, Trondheim, Norway
| | - Hanieh Mohammad Rahimi
- Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Monireh Sadat Hosseini
- Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sara Aghaei
- Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Negar Khalili
- Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hamed Mirjalali
- Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Mohammad Reza Zali
- Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Chen S, Meng W, Zhou Z, Deng L, Shi X, Chai Y, Liu H, Cheng Y, Zhong Z, Fu H, Shen L, Zhang K, He T, Peng G. Genetic characterization and zoonotic potential of Blastocystis from wild animals in Sichuan Wolong National Natural Reserve, Southwest China. Parasite 2021; 28:73. [PMID: 34706216 PMCID: PMC8550814 DOI: 10.1051/parasite/2021071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 10/13/2021] [Indexed: 11/24/2022] Open
Abstract
Blastocystis is a prevalent eukaryotic parasite that has been identified in a wide range of hosts. Several species are considered potential sources of Blastocystis infection in humans, but little is known about the prevalence of Blastocystis in wild animals. In this study, the prevalence and subtypes of Blastocystis were investigated to assess the zoonotic potential of wild animals in Sichuan Wolong National Natural Reserve. A total of 300 fecal samples were collected from 27 wildlife species in three areas of the Reserve. The subtype (ST), genetic characteristics, and prevalence of Blastocystis were determined by PCR amplification of part (~600 bp) of the SSU rRNA gene. Thirty fecal samples (10.0%) were Blastocystis-positive. The highest prevalence of Blastocystis was found in Yinchanggou (18.3%), with significantly less found in Niutoushan (7.5%) and Genda (5.5%) (p < 0.05). No significant differences were associated with different orders of animals in prevalence, which may be because of the small number of positive samples obtained. Sequence analysis showed five subtypes (ST1, ST3, ST5, ST13, and ST14), with ST13 and ST14 being predominant (33% each), followed by ST1 (20%). This is the first molecular investigation of Blastocystis infection in the wild animals of southwestern China. Subtypes ST1, ST3, ST5, and ST14 have previously been identified in humans, suggesting that wild animals may be potential reservoirs of Blastocystis for humans.
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Affiliation(s)
- Shanyu Chen
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Wanyu Meng
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Ziyao Zhou
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Lei Deng
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Xiaogang Shi
- Sichuan Wolong National Natural Reserve Administration Aba 623006 Sichuan PR China
| | - Yijun Chai
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Haifeng Liu
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Yuehong Cheng
- Sichuan Wolong National Natural Reserve Administration Aba 623006 Sichuan PR China
| | - Zhijun Zhong
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Hualin Fu
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Liuhong Shen
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Kun Zhang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
| | - Tingmei He
- Sichuan Wolong National Natural Reserve Administration Aba 623006 Sichuan PR China
| | - Guangneng Peng
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University Chengdu 611130 Sichuan PR China
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Sarzhanov F, Dogruman-Al F, Santin M, Maloney JG, Gureser AS, Karasartova D, Taylan-Ozkan A. Investigation of neglected protists Blastocystis sp. and Dientamoeba fragilis in immunocompetent and immunodeficient diarrheal patients using both conventional and molecular methods. PLoS Negl Trop Dis 2021; 15:e0009779. [PMID: 34613993 PMCID: PMC8494357 DOI: 10.1371/journal.pntd.0009779] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 08/30/2021] [Indexed: 02/07/2023] Open
Abstract
Introduction The clinical significance of Blastocystis sp. and Dientamoeba fragilis in patients with gastrointestinal symptoms is a controversial issue. Since the pathogenicity of these protists has not been fully elucidated, testing for these organisms is not routinely pursued by most laboratories and clinicians. Thus, the prevalence of these organisms and the subtypes of Blastocystis sp. in human patients in Turkey are not well characterized. This study aimed to determine the prevalence of Blastocystis sp. and D. fragilis in the diarrheic stool samples of immunodeficient and immunocompetent patients using conventional and molecular methods and to identify Blastocystis sp. subtypes using next generation sequencing. Material and methods Individual stool specimens were collected from 245 immunodeficient and 193 immunocompetent diarrheic patients between March 2017 and December 2019 at the Gazi University Training and Research Hospital in Ankara, Turkey. Samples were screened for Blastocystis sp. and D. fragilis by conventional and molecular methods. Molecular detection of both protists was achieved by separate qPCRs targeting a partial fragment of the SSU rRNA gene. Next generation sequencing was used to identify Blastocystis sp. subtypes. Results The prevalence of Blastocystis sp. and D. fragilis was 16.7% and 11.9%, respectively as measured by qPCR. The prevalence of Blastocystis sp. and D. fragilis was lower in immunodeficient patients (12.7% and 10.6%, respectively) compared to immunocompetent patients (21.8% and 13.5%, respectively). Five Blastocystis sp. subtypes were identified and the following subtype distribution was observed: ST3 54.4% (n = 37), ST2 16.2% (n = 11), ST1 4.4% (n = 3), ST6 2.9% (n = 2), ST4 1.5% (n = 1), ST2/ST3 11.8% (n = 8) and ST1/ST3 8.8% (n = 6). There was no statistically significant difference in the distribution of Blastocystis sp. subtypes between immunocompetent and immunodeficient patients. Conclusion and recommendation Our findings demonstrated that Blastocystis sp. and D. fragilis are commonly present in immunocompetent and immunodeficient patients with diarrhea. This study is the first to use next generation sequencing to address the presence of Blastocystis sp. mixed subtypes and intra-subtype variability in clinical samples in Turkey. Blastocystis sp. and Dientamoeba fragilis are single-cell parasites of the human intestine which are common worldwide and reported in cases with gastrointestinal symptoms. However, the role of Blastocystis sp. and D. fragilis in patients with gastrointestinal symptoms is still controversial because their presence is not always associated with symptoms. As some intestinal parasitic infections can cause severe illness in immunocompromised individuals careful consideration of intestinal protist infection is warranted. However, testing for Blastocystis sp. and D. fragilis is not routinely carried out by most laboratories and clinicians. Therefore, this study aimed to determine the prevalence of Blastocystis sp. and D. fragilis in immunocompetent and immunosuppressed patients with diarrhea by conventional and molecular methods. Both Blastocystis sp. and D. fragilis were detected more frequently by quantitative polymerase chain reaction than by conventional methods. Next generation sequencing was used to characterize the diversity and frequency of Blastocystis sp. subtypes and mixed subtypes in patients in Turkey. Five Blastocystis sp. subtypes (ST1, ST2, ST3, ST4 and ST6) were detected. ST3 was the most frequent subtype in both immunocompetent and immunosuppressed patients. Mono-infections were more common than mixed subtype infections. Our findings showed that Blastocystis sp. and D. fragilis are commonly present in immunocompetent and immunodeficient patients with diarrhea.
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Affiliation(s)
- Fakhriddin Sarzhanov
- Division of Medical Parasitology, Department of Medical Microbiology, School of Medicine, Gazi University, Ankara, Turkey
- Akhmet Yassawi International Kazakh-Turkish University, Faculty of Medicine, Turkestan, Kazakhstan
| | - Funda Dogruman-Al
- Division of Medical Parasitology, Department of Medical Microbiology, School of Medicine, Gazi University, Ankara, Turkey
- * E-mail: ,
| | - Monica Santin
- Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland, United States of America
| | - Jenny G. Maloney
- Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland, United States of America
| | - Ayse Semra Gureser
- Department of Medical Microbiology, School of Medicine, Hitit University, Corum, Turkey
| | - Djursun Karasartova
- Department of Medical Microbiology, School of Medicine, Hitit University, Corum, Turkey
| | - Aysegul Taylan-Ozkan
- Department of Medical Microbiology, School of Medicine, Hitit University, Corum, Turkey
- Department of Medical Microbiology, Faculty of Medicine, TOBB- University of Economics and Technology, Ankara, Turkey
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Nemati S, Zali MR, Johnson P, Mirjalali H, Karanis P. Molecular prevalence and subtype distribution of Blastocystis sp. in Asia and in Australia. JOURNAL OF WATER AND HEALTH 2021; 19:687-704. [PMID: 34665764 DOI: 10.2166/wh.2021.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Blastocystis is a prevalent protozoan parasite reported in humans, animals, and environmental samples. Over the past decade, numerous studies have investigated the prevalence and subtype distribution of Blastocystis sp. alongside with its genetic and biochemical features. However, studies on subtype distribution of this protozoan in humans, animals, and environmental samples represent the potential transmission routes. In this review, we evaluated studies performed in Asian countries and in Australia to provide an overview of environmental factors on the prevalence and subtype distribution of Blastocystis sp. among humans, animals, and the environment.
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Affiliation(s)
- Sara Nemati
- Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran E-mail:
| | - Mohammad Reza Zali
- Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Paul Johnson
- Department of Basic and Clinical Sciences, Nicosia University Medical School, Nicosia 2408, Cyprus
| | - Hamed Mirjalali
- Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran E-mail:
| | - Panagiotis Karanis
- Department of Basic and Clinical Sciences, Nicosia University Medical School, Nicosia 2408, Cyprus; Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
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Popruk S, Adao DEV, Rivera WL. Epidemiology and subtype distribution of Blastocystis in humans: A review. INFECTION GENETICS AND EVOLUTION 2021; 95:105085. [PMID: 34530156 DOI: 10.1016/j.meegid.2021.105085] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 09/08/2021] [Accepted: 09/11/2021] [Indexed: 12/19/2022]
Abstract
Blastocystis is a commonly encountered gastrointestinal protozoan in humans and animals with uncertain pathogenicity. Despite its potential public health impact, epidemiological data regarding the prevalence and molecular subtype (ST) distribution of Blastocystis have been rarely reported. Among Blastocystis STs, ST1-ST4 are common in humans, including healthy and immunodeficient populations. According to the Chi-squared (χ2) association based on the data compiled for this cross-sectional study, the presence of ST1 is associated with asymptomatic infection, whereas the presence of ST4 is associated with symptomatic infection. However, cross-sectional studies cannot clarify the potential pathogenicity of Blastocystis, unlike in vivo and in vitro studies. Poor hygiene, poor sanitation and zoonotic transmission are possible factors associated with high Blastocystis prevalence, although this protozoan may be part of the normal healthy human gastrointestinal microbiota. This review covers the prevalence, STs and distribution of Blastocystis infection in humans. Thus, future epidemiological and subtyping studies could reveal new STs in humans as well as possible associations of STs with disease, drug resistance and related mechanisms such as protease activity. These associations with proper ST identification may facilitate the control of potential threats to host health, including the direct pathogenic effects of Blastocystis or alterations of the gastrointestinal microbiome.
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Affiliation(s)
- Supaluk Popruk
- Department of Protozoology, Faculty of Tropical Medicine, Mahidol University, 420/6 Ratchawithi Road, Bangkok 10400, Thailand
| | - Davin Edric V Adao
- Pathogen-Host-Environment Interactions Research Laboratory, Institute of Biology, College of Science, University of the Philippines Diliman, Quezon City 1101, Philippines
| | - Windell L Rivera
- Pathogen-Host-Environment Interactions Research Laboratory, Institute of Biology, College of Science, University of the Philippines Diliman, Quezon City 1101, Philippines.
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Comparative molecular prevalence and subtypes distribution of Blastocystis sp. a potentially zoonotic infection isolated from symptomatic and asymptomatic patients in Iran: A systematic review and meta-analysis. Acta Parasitol 2021; 66:745-759. [PMID: 33686524 DOI: 10.1007/s11686-021-00360-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 02/24/2021] [Indexed: 01/09/2023]
Abstract
PURPOSE The present systematic review and meta-analysis was aimed to assess the weighted molecular prevalence of Blastocystis sp. in humans along with the comparative molecular prevalence and subtypes distribution of Blastocystis isolated from symptomatic and asymptomatic patients in Iran. METHODS International electronic databases including Medline/PubMed, ProQuest, Scopus, Embase, and Google Scholar were explored until 4th October 2020. Heterogeneity index was evaluated among studies using Cochran's Q test and I2 index. Finally, 23 eligible studies were qualified to be included in this review. RESULTS The pooled molecular prevalence of Blastocystis sp. in Iran was reported 15.2% (95% CI 11.5-19.7). In addition, the molecular prevalence based on PCR-sequencing and STS primers was reported 12.5% (95% CI 8.6-17.7) and 19.8% (95% CI 13.1-28.8), respectively. Interestingly, there was a considerably higher prevalence among asymptomatic patients [25.1% (95% CI 20.8-30.0)] in comparison to symptomatic ones [21.0% (95% CI 15.9-27.2)]. In addition, the frequency of Blastocystis ST1, ST2, and ST3 from positive samples in symptomatic patients was 19.7%, 35.1%, and 47.4%, respectively. In addition, the prevalence of Blastocystis ST1, ST2, and ST3 from positive samples in asymptomatic patients was 27.1%, 26.8%, and 37.8%, respectively. The results obtained in Iran showed that Blastocystis is more common in asymptomatic patients compared to patients having clinical symptoms. Of note, ST3, as the most common subtype causing clinical symptoms, was the most prevalent reported subtype among both symptomatic and asymptomatic patients in the country. CONCLUSIONS Hence, the pathogenicity of the Blastocystis parasite is not subtype-specific and appears to be related to a variety of risk factors. Still the Blastocystis epidemiology is open to question and more large-scale studies should be performed on this aspect.
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Prevalence and genetic characteristics of Blastocystis hominis and Cystoisospora belli in HIV/AIDS patients in Guangxi Zhuang Autonomous Region, China. Sci Rep 2021; 11:15904. [PMID: 34354101 PMCID: PMC8342556 DOI: 10.1038/s41598-021-94962-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 07/06/2021] [Indexed: 11/04/2022] Open
Abstract
Blastocystis hominis and Cystoisospora belli are considered to be common opportunistic intestinal protozoa in HIV/AIDS patients. In order to investigate the prevalence and genetic characteristics of B. hominis and C. belli in HIV/AIDS patients, a total of 285 faecal samples were individually collected from HIV/AIDS patients in Guangxi, China. B. hominis and C. belli were investigated by amplifying the barcode region of the SSU rRNA gene and the internal transcribed spacer 1 (ITS-1) region of the rRNA gene, respectively. Chi-square test or Fisher’s exact test were conducted to assess the risk factors related to B. hominis and C. belli infection. The prevalence of B. hominis and C. belli was 6.0% (17/285) and 1.1% (3/285) respectively. Four genotypes of B. hominis were detected, with ST3 (n = 8) and ST1 (n = 6) being predominant, followed by ST6 (n = 2) and ST7 (n = 1). Females had a statistically higher prevalence of B. hominis (11.6%) than males (4.2%). The statistical analysis also showed that the prevalence of B. hominis was significantly associated with age group and educational level. Our study provides convincing evidence for the genetic diversity of B. hominis, which indicates its potential zoonotic transmission and is the first report on the molecular characteristics of C. belli in HIV/AIDS patients in China.
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Investigation of Isolated Blastocystis Subtypes from Cancer Patients in Turkey. Acta Parasitol 2021; 66:584-592. [PMID: 33387270 DOI: 10.1007/s11686-020-00322-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 11/28/2020] [Indexed: 01/03/2023]
Abstract
PURPOSE It is not clear that Blastocystis remains without damage to the digestive tract or has a pathogenic effect in relation to subtypes in immunocompromised people, such as cancer patients. The present study aimed to investigate the frequency and subtype distribution of Blastocystis in cancer patients who were followed-up and treated in the Oncology clinic of Firat University Hospital and to determine the clinical signs of infected sufferers. METHODS 201 patients aged ≥ 18 with a diagnosis of cancer were enrolled in this cross-sectional study. Patients' stool samples were examined between September 2017 and August 2019 by native-Lugol, trichrome staining. Microscopy-positive stool samples were subjected to DNA isolation and subtyped by Sequence Tagged Site (STS)-PCR analysis. The symptoms and demographic characteristics of the patients were also evaluated. RESULTS Totally, 29 (14.4%) samples were positive for Blastocystis after all methods. 15 (51.7%) out of 29 samples were successfully subtyped by the sequenced-tagged site(STS)-PCR, while 14 (48.3%) could not be typed. Three subtypes of Blastocystis were detected: ST3 (40%), ST2 (33%), ST1 (20%), and one mixed infections with ST1/ST2 (6%). There was no statistically significant difference in terms of clinical findings and demographic characteristics. CONCLUSION The outcomes of our study promote the idea that Blastocystis could be an asymptomatic and harmless commensal organism. However, more comprehensive molecular and clinical studies are needed to fully determine the pathogenicity and epidemiology of Blastocystis in cancer patients.
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Zou Y, Yang WB, Zou FC, Lin RQ, Zhu XQ, Hou JL. Molecular detection and subtype distribution of Blastocystis in farmed pigs in southern China. Microb Pathog 2021; 151:104751. [PMID: 33482261 DOI: 10.1016/j.micpath.2021.104751] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 10/22/2022]
Abstract
Blastocystis is one of the most common causative agents of intestinal diseases, which can cause enteric diseases in animals and humans. However, limited data is available on the prevalence or subtypes of Blastocystis infections in farmed pigs in southern China. In this study, a total of 396 fecal samples were collected from farmed pigs in three provinces in southern China in 2016, and screened for Blastocystis by PCR amplification of the small subunit rRNA (SSU rRNA) gene fragment. One hundred and seventy (42.93%) of the examined fecal samples were detected Blastocystis-positive, and two known zoonotic subtypes ST1 and ST5 were identified, with ST5 being the predominate subtype. Moreover, gender, age and region were considered as risk factors that associated with Blastocystis infection in farmed pigs. The present study revealed the prevalence and subtypes of Blastocystis infections in farmed pigs in southern China, which provided essential data for the control of Blastocystis infections in pigs, other animals and humans in China.
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Affiliation(s)
- Yang Zou
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province, 730046, PR China.
| | - Wen-Bin Yang
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province, 730046, PR China
| | - Feng-Cai Zou
- Key Laboratory of Veterinary Public Health of Higher Education of Yunnan Province, College of Veterinary Medicine, Yunnan Agricultural University, Kunming, Yunnan Province, 650201, PR China
| | - Rui-Qing Lin
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province, 510642, PR China
| | - Xing-Quan Zhu
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province, 730046, PR China; Key Laboratory of Veterinary Public Health of Higher Education of Yunnan Province, College of Veterinary Medicine, Yunnan Agricultural University, Kunming, Yunnan Province, 650201, PR China; College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi Province, 030801, PR China
| | - Jun-Ling Hou
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province, 730046, PR China.
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Khaled S, Gantois N, Ly AT, Senghor S, Even G, Dautel E, Dejager R, Sawant M, Baydoun M, Benamrouz-Vanneste S, Chabé M, Ndiaye S, Schacht AM, Certad G, Riveau G, Viscogliosi E. Prevalence and Subtype Distribution of Blastocystis sp. in Senegalese School Children. Microorganisms 2020; 8:microorganisms8091408. [PMID: 32932661 PMCID: PMC7564003 DOI: 10.3390/microorganisms8091408] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 09/07/2020] [Accepted: 09/10/2020] [Indexed: 12/12/2022] Open
Abstract
Blastocystis sp. is an enteric protozoan that frequently colonizes humans and many animals. Despite impacting on human health, data on the prevalence and subtype (ST) distribution of Blastocystis sp. remain sparse in Africa. Accordingly, we performed the first multicenter and largest epidemiological survey ever conducted on Blastocystis sp. for this continent. A total of 731 stool samples collected from healthy school children living in 10 villages of the northwestern region of Senegal were tested for the presence of Blastocystis sp. by real-time polymerase chain reaction followed by subtyping of positive samples. Considerable variation in prevalence between villages (51.7 to 100%) was evident with the overall prevalence being 80.4%. Mixed infections were identified in 23% of positive individuals. Among 453 school children with a single infection, ST2 was predominant, followed by ST1, ST3, ST7, ST10, and ST14; this is the first report of ST10 and ST14 in humans. Genetic polymorphisms were evident at the intra-ST level with the identification of numerous ST1 to ST3 genotypes. ST1 showed the greatest intra-ST diversity followed by ST2 and ST3. The prevalence and distribution of STs and genotypes varied among target villages, pointing to several potential infection sources, including human-to-human, zoonotic, and waterborne transmission.
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Affiliation(s)
- Salma Khaled
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
| | - Nausicaa Gantois
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
| | - Amadou Tidjani Ly
- Biomedical Research Center Espoir Pour La Santé (BRC-EPLS), BP 226 Saint-Louis, Senegal; (A.T.L.); (S.S.)
| | - Simon Senghor
- Biomedical Research Center Espoir Pour La Santé (BRC-EPLS), BP 226 Saint-Louis, Senegal; (A.T.L.); (S.S.)
| | - Gaël Even
- Gènes Diffusion, F-59501 Douai, France;
- PEGASE-Biosciences (Plateforme d’Expertises Génomiques Appliquées aux Sciences Expérimentales), Institut Pasteur de Lille, F-59000 Lille, France
| | - Ellena Dautel
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
| | - Romane Dejager
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
| | - Manasi Sawant
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
| | - Martha Baydoun
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
| | - Sadia Benamrouz-Vanneste
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
- Laboratoire Ecologie et Biodiversité, Institut Catholique de Lille, Faculté de Gestion Economie et Sciences, F-59000 Lille, France
| | - Magali Chabé
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
| | - Seynabou Ndiaye
- Région Médicale de Saint-Louis, MSAS, BP 226 Saint-Louis, Senegal;
| | - Anne-Marie Schacht
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
- Biomedical Research Center Espoir Pour La Santé (BRC-EPLS), BP 226 Saint-Louis, Senegal; (A.T.L.); (S.S.)
| | - Gabriela Certad
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
- Délégation à la Recherche Clinique et à l’Innovation, Groupement des Hôpitaux de l’Institut Catholique de Lille, F-59000 Lille, France
| | - Gilles Riveau
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
- Biomedical Research Center Espoir Pour La Santé (BRC-EPLS), BP 226 Saint-Louis, Senegal; (A.T.L.); (S.S.)
| | - Eric Viscogliosi
- Institut Pasteur de Lille, U1019–UMR 9017–CIIL–Centre d’Infection et d’Immunité de Lille, University of Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France; (S.K.); (N.G.); (E.D.); (R.D.); (M.S.); (M.B.); (S.B.-V.); (M.C.); (A.-M.S.); (G.C.); (G.R.)
- Correspondence:
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Delshad A, Saraei M, Alizadeh SA, Niaraki SR, Alipour M, Hosseinbigi B, Bozorgomid A, Hajialilo E. Distribution and molecular analysis of Blastocystis subtypes from gastrointestinal symptomatic and asymptomatic patients in Iran. Afr Health Sci 2020; 20:1179-1189. [PMID: 33402964 PMCID: PMC7751524 DOI: 10.4314/ahs.v20i3.21] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
INTRODUCTION Blastocystis is a common intestinal parasite of human and animal hosts. The parasite has 17 subtypes, and among those at least nine subtypes (ST1-ST9) are found in human hosts. OBJECTIVE The aim of the present study was to investigate the presence of different subtypes of Blastocystis spp. among the patients referred to Velayat hospital of Qazvin province, Iran. METHODS Overall, 864 stool samples were examined by using formalin-ethyl acetate concentration method and Trichrome staining. All specimens were cultured in clotted fetal bovine medium. Later, DNA extraction and PCR amplification of 18S ribosomal RNA gene region was conducted and phylogenetic tree constructed. RESULTS The results revealed 7.9% (68/864) of the study population were infected with Blastocystis. Intestinal symptoms were observed in 61% (36/59) of individuals positive for Blastocystis, with abdominal pain in 58% (21/36) of cases which was more frequent than other intestinal signs. No significant relationship was observed among the study variables. By molecular and phylogenetic analysis, three subtypes ST1 (45%), ST2 (30%) and ST3 (23%) of parasite were identified. CONCLUSION This study showed ST1 subtype was the predominant subtype among the positive specimens, meanwhile the highest haplotype and nucleotide diversity were clarified in ST3 subtype.
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Affiliation(s)
- Asma Delshad
- Student Research Committee, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Mehrzad Saraei
- Cellular and Molecular Research Center, Research Institute for Prevention of Non- Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
- Department of Parasitology and Mycology, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Safar Ali Alizadeh
- Medical Microbiology Research Center, Qazvin University of Medical Sciences, Qazvin, Iran
- Department of Microbiology, Qazvin University of Medical Sciences, Qazvin, Iran
| | | | - Mahmood Alipour
- Department of Social Medicine, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Bahram Hosseinbigi
- Medical Microbiology Research Center, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Arezoo Bozorgomid
- Infectious Diseases Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Elham Hajialilo
- Cellular and Molecular Research Center, Research Institute for Prevention of Non- Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
- Department of Parasitology and Mycology, Qazvin University of Medical Sciences, Qazvin, Iran
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Niaraki SR, Hajialilo E, Delshad A, Alizadeh SA, Alipour M, Heydarian P, Saraei M. Molecular epidemiology of Blastocystis spp. in children referred to Qods hospital in northwest of Iran. J Parasit Dis 2019; 44:151-158. [PMID: 32174719 DOI: 10.1007/s12639-019-01177-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 11/11/2019] [Indexed: 11/28/2022] Open
Abstract
Blastocystis sp. is a polymorphic intestinal parasite in humans and animals. The parasite has a worldwide distribution, especially in developing countries with poor sanitation, exposure to animals, and improper disposal systems. The aim of this study was to identify the subtypes of Blastocystis sp. among children of Qazvin, northwest Iran. Totally, 864 stool samples were collected from the children referred to Qods hospital in Qazvin, Iran. Fecal specimens were investigated by formalin-ethyl acetate concentration method and trichrome staining as well as cultivation of all samples in clotted fetal bovine medium. DNA extraction of culture-positive specimens and PCR amplification of 18S ribosomal RNA gene region was performed. The sequences detected were compared with reference genes in the GenBank, and the sequences further deposited in the GenBank database. Data analysis was performed by Chi square test while a p value of < 0.05 was considered as significant. Of 864 isolates, 4.1% (36/864) were positive for Blastocystis sp. with infection rate insignificantly higher among the females than males. The highest infection rate was estimated at 6.8% in 6-9 years old age group with abdominal pain as the most common (33%) gastrointestinal sign. No statistically significant difference was found between the variables and Blastocystis infection. Molecular analysis clarified the presence of three subtypes of Blastocystis including ST1 (56%), ST2 (28%), and ST3 (16%) of among specimens with ST1 as the predominant subtype. A significant association between intestinal signs and the subtypes was not found. Considering ST1 as the predominant subtype, it seems that zoonotic transmission is a main route of human infections with Blastocystis sp. in the area studied.
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Affiliation(s)
- Soheila Rahimi Niaraki
- 1Department of Medical Parasitology and Mycology, School of Medicine, Qazvin University of Medical Sciences, Qazvin, 34197-59811 Iran.,2Student Research Committee, School of Medicine, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Elham Hajialilo
- 1Department of Medical Parasitology and Mycology, School of Medicine, Qazvin University of Medical Sciences, Qazvin, 34197-59811 Iran.,3Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Asma Delshad
- 1Department of Medical Parasitology and Mycology, School of Medicine, Qazvin University of Medical Sciences, Qazvin, 34197-59811 Iran.,2Student Research Committee, School of Medicine, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Safar Ali Alizadeh
- 4Department of Microbiology, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Mahmood Alipour
- 5Department of Social Medicine, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Peyman Heydarian
- 1Department of Medical Parasitology and Mycology, School of Medicine, Qazvin University of Medical Sciences, Qazvin, 34197-59811 Iran.,3Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Mehrzad Saraei
- 1Department of Medical Parasitology and Mycology, School of Medicine, Qazvin University of Medical Sciences, Qazvin, 34197-59811 Iran.,3Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
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Melo GBD, Malta FDM, Maruta CW, Criado PR, Castilho VLP, Gonçalves EMDN, Espirito-Santo MCDCD, Paula FMD, Gryschek RCB. Characterization of subtypes of Blastocystis sp. isolated from patients with urticaria, São Paulo, Brazil. Parasite Epidemiol Control 2019; 7:e00124. [PMID: 31872093 PMCID: PMC6911935 DOI: 10.1016/j.parepi.2019.e00124] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 10/18/2019] [Accepted: 11/05/2019] [Indexed: 01/01/2023] Open
Abstract
Blastocystis sp. is described as an enteric protist prevalent in fecal samples from humans and animals; its pathogenicity and epidemiology are still controversial. Currently, it has been associated with intestinal diseases such as irritable bowel syndrome and clinical manifestations of allergic skin, such as chronic urticaria. In the context of urticaria, it is still uncertain whether this organism is directly related to the allergic manifestation or just a common component of the intestinal microbiota. This study aimed to evaluate the occurrence and molecular diversity of Blastocystis sp. in individuals with urticaria from a dermatology outpatient clinic, São Paulo, Brazil. Fecal samples of 58 patients with urticaria were examined using parasitological methods; and subsequently tested by polymerase chain reaction using Blastocystis-specific primers. The subtypes (STs) and alleles (a) were determined using BLASTn and MLST tools. ST1, ST2, ST3, ST4, ST6 and mixed infection (ST1 + ST3) were identified in the patients with urticaria; ST1 (a4), ST3 (a34 and a36) and ST4 (a42) were the most prevalent. Our molecular analyses allowed an initial description of Blastocystis subtypes in patients with urticaria from São Paulo city, Brazil.
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Affiliation(s)
- Gessica Baptista de Melo
- Laboratório de Imunopatologia da Esquistossomose (LIM-06), Instituto de Medicina Tropical de São Paulo, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
- Corresponding author.
| | - Fernanda de Mello Malta
- Laboratório de Gastroenterologia e Hepatologia Tropical (LIM-07), Instituto de Medicina Tropical de São Paulo, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Celina Wakisaka Maruta
- Departamento de Dermatologia, Hospital Das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Paulo Ricardo Criado
- Departamento de Dermatologia, Hospital Das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
- Faculdade de Medicina Do ABC, São Paulo, Brazil
| | - Vera Lucia Pagliusi Castilho
- Seção de Parasitologia, Divisão Do Laboratório Central, Hospital Das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | | | | | - Fabiana Martins de Paula
- Laboratório de Imunopatologia da Esquistossomose (LIM-06), Instituto de Medicina Tropical de São Paulo, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Ronaldo Cesar Borges Gryschek
- Laboratório de Imunopatologia da Esquistossomose (LIM-06), Instituto de Medicina Tropical de São Paulo, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
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Srichaipon N, Nuchprayoon S, Charuchaibovorn S, Sukkapan P, Sanprasert V. A Simple Genotyping Method for Rapid Differentiation of Blastocystis Subtypes and Subtype Distribution of Blastocystis spp. in Thailand. Pathogens 2019; 8:pathogens8010038. [PMID: 30901902 PMCID: PMC6471993 DOI: 10.3390/pathogens8010038] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 03/19/2019] [Accepted: 03/20/2019] [Indexed: 01/12/2023] Open
Abstract
Blastocystis spp. is one of the most common protozoa of humans and animals worldwide. The genetic diversity of Blastocystis spp. might be associated with a wide range of symptoms. However, the prevalence of each subtype is different in each country. Until now, there is no standard method for subtyping of Blastocystis spp. We developed a sequential restriction fragment length polymorphism (RFLP) analysis for the rapid differentiation of human Blastocystis subtypes. A large-scale study was also conducted to determine the subtype distribution of Blastocystis spp. in Thailand. Stool samples were collected from 1025 school-age students in four regions of Thailand. Blastocystis infections were identified by direct smear, formalin ethyl-acetate concentration technique (FECT), Boeck and Drbohlav’s Locke-Egg-Serum (LES) medium culture, and polymerase chain reaction (PCR) of small-subunit ribosomal DNA (SSU rDNA). Subtypes of Blastocystis spp. were determined by RFLP. Phylogenetic tree of partial SSU rDNA sequences of Blastocystis spp. was constructed using the Maximum Likelihood (ML) method. Out of 1025 students, 416 (40.6%) were positive for Blastocystis spp. Using two steps of RFLP reactions, we could determine subtype one–three among these students. Subtype 3 was the most common subtype (58.72%) in Thai students, followed by subtype 1 (31.2%), and subtype 2 (10.1%). Blastocystis subtype 3 was the most prevalent in all regions of Thailand. The subtype distribution of Blastocystis spp. in Thailand was different from other countries.
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Affiliation(s)
- Nittaya Srichaipon
- Lymphatic Filariasis and Tropical Medicine Research Unit, Chulalongkorn Medical Research Center, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Surang Nuchprayoon
- Lymphatic Filariasis and Tropical Medicine Research Unit, Chulalongkorn Medical Research Center, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
- Department of Parasitology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Sarit Charuchaibovorn
- Lymphatic Filariasis and Tropical Medicine Research Unit, Chulalongkorn Medical Research Center, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Pattadon Sukkapan
- Program of Biology, Faculty of Science, Chandrakasem Rajabhat University, Bangkok 10900, Thailand.
| | - Vivornpun Sanprasert
- Lymphatic Filariasis and Tropical Medicine Research Unit, Chulalongkorn Medical Research Center, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
- Department of Parasitology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
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Diarthini NLPE, Swastika IK, Ariwati L, Isyaputri R, Fitri N MY, Hidajati S, Basuki S. BLASTOCYSTIS AND OTHER INTESTINAL PARASITES INFECTIONS IN ELEMENTARY SCHOOL CHILDREN IN DUKUH VILLAGE, KARANGASEM DISTRICT, BALI. INDONESIAN JOURNAL OF TROPICAL AND INFECTIOUS DISEASE 2018. [DOI: 10.20473/ijtid.v7i3.7323] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Blastocystis spp. is the most common enteric parasitic infection found in several community surveys from developing countries. Blastocystis infections may cause gastrointestinal symptoms, but also cause extraintestinal symptoms such as urticaria and joint pain. Blastocystis infection can also be asymptomatic or a carrier. However, the prevalence of Blastocystis infection in children has not yet been fully investigated in Indonesia, particularly in Bali Province. This study aimed to determine the prevalence of Blastocystis and other intestinal parasites in elementary school children stools in Dukuh village, Karangasem regency. A cross sectional study was conducted in September 2016. A total of 103 school children stools were collected by informed consent and parasites were examined by microscopy with wet mounts method using Lugol’s iodine solution. Thirty-five school children were infected with Blastocystis spp. (35/103, 34%) that consisted of a single infection (29/35, 82.9%) and mix infection with other parasites (6/35, 17.1%). The mix infections were Blastocystis spp. and hookworm infection (1/6, 16.7%), Blastocystis spp. and Entamoeba coli (1/6, 16.7%), Blastocystis spp. and Giardia lamblia (2/6, 33.3%), Blastocystis spp. and Entamoeba histolytica/ Entamoeba dispar (1/6, 16.7%) and Blastocystis spp. and Entamoeba histolytica/ Entamoeba dispar and Giardia lamblia (1/6, 16.7%). The vacuolar forms of Blastocystis were dominantly found, in which was non-infectious form, whereas the infectious form is the cyst form and Blastocystis density was observed less than 5 cells per field of view at 400 magnification in all cases. This study concluded that the high prevalence of Blastocystis infection in elementary school children in Dukuh Village, Karangasem District, Bali that were dominantly single infections and several mix infections with other intestinal parasites. The high prevalence of Blastocystis infection in elementary school children suggested that it needs proper prevention measures for the children in this study area.
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Javanmard E, Niyyati M, Ghasemi E, Mirjalali H, Asadzadeh Aghdaei H, Zali MR. Impacts of human development index and climate conditions on prevalence of Blastocystis: A systematic review and meta-analysis. Acta Trop 2018; 185:193-203. [PMID: 29802845 DOI: 10.1016/j.actatropica.2018.05.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 04/11/2018] [Accepted: 05/19/2018] [Indexed: 01/14/2023]
Abstract
Blastocystis is a prevalent eukaryotic microorganism that has been frequently reported from the stool samples of human and animals, all over the world. The prevalence of this parasite has close correlation with the climate and hygiene situation of studied populations. For the current study, English and Persian databases were searched for the following terms: "Blastocystis hominis", "Blastocystis sp.", "Intestinal Parasites", "Prevalence" and "Iran". In order to data analysis and assess the possibility of publication bias, STATA v11 and Begg's Funnel plot were employed respectively. From 605 searched cases, 86 publications met our criteria for the analysis. The pooled prevalence of Blastocystis was 9.1% (95%CI: 8.2%, 10.1%). The results represented that the prevalence of the parasite using molecular techniques or cultivation followed by molecular techniques (20.89%) was higher than only microscopical examination (8.96%). The prevalence rate of Blastocystis according to human development index was 7.6%, 7.2%, 11.9%, 13.4%, and 3.3% for ranks 1 to 5, respectively. This is the first study signifying the prevalence of Blastocystis regarding the human development index and climate conditions. The findings represented that although human development index, low levels of socioeconomic situations together with appropriate climate such as sufficient humidity and high temperature increase the chance of transmission of Blastocystis in a society.
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Sari IP, Benung MR, Wahdini S, Kurniawan A. Diagnosis and Identification of Blastocystis Subtypes in Primary School Children in Jakarta. J Trop Pediatr 2018; 64:208-214. [PMID: 28977665 DOI: 10.1093/tropej/fmx051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Blastocystis hominis is an enteric protozoan with many subtypes. It is frequently found in children and may cause chronic diarrhea. This study revealed Blastocystis subtypes among primary school children and comparison of molecular technique and culture method in Blastocystis diagnosis. A total of 141 stools were collected, examined microscopically, selected into the Blastocystis and negative parasite groups, for diagnostic comparison between culture and 18S rRNA polymerase chain reaction (PCR) methods. Positive PCR amplicons were subsequently sequenced for subtyping. The PCR results revealed 89%, 78%, 80% and 88% sensitivity, specificity and positive and negative predictive values, respectively, in comparison with the culture method (McNemar, p > 0.05). Sixteen PCR samples were successfully sequenced and resulted in three Blastocystis subtypes 1, 3 and 4. In conclusion, PCR was sensitive enough and can be used to exclude Blastocystis infection up to 88% of the cases. Subtypes 3 and 1 were the main subtypes found in apparently healthy school children in Jakarta.
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Affiliation(s)
- Ika P Sari
- Department of Parasitology, Faculty of Medicine, Universitas Indonesia, Jakarta 10430, Indonesia
| | - Martwinny R Benung
- Department of Parasitology, Faculty of Medicine, Universitas Indonesia, Jakarta 10430, Indonesia.,South Kalimantan Public Health Office, Banjarmasin, Indonesia
| | - Sri Wahdini
- Department of Parasitology, Faculty of Medicine, Universitas Indonesia, Jakarta 10430, Indonesia
| | - Agnes Kurniawan
- Department of Parasitology, Faculty of Medicine, Universitas Indonesia, Jakarta 10430, Indonesia
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Dacal E, Saugar JM, de Lucio A, Hernández-de-Mingo M, Robinson E, Köster PC, Aznar-Ruiz-de-Alegría ML, Espasa M, Ninda A, Gandasegui J, Sulleiro E, Moreno M, Salvador F, Molina I, Rodríguez E, Carmena D. Prevalence and molecular characterization of Strongyloides stercoralis, Giardia duodenalis, Cryptosporidium spp., and Blastocystis spp. isolates in school children in Cubal, Western Angola. Parasit Vectors 2018; 11:67. [PMID: 29378626 PMCID: PMC5789528 DOI: 10.1186/s13071-018-2640-z] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 01/11/2018] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND Human infections by the gastrointestinal helminth Strongyloides stercoralis and the enteric protozoans Giardia duodenalis, Cryptosporidium spp. and Blastocystis spp. are not formally included in the list of 20 neglected tropical diseases prioritised by the World Health Organization. Although largely underdiagnosed and considered of lower public health relevance, these infections have been increasingly demonstrated to cause significant morbidity and even mortality globally, particularly among children living in resource-poor settings. METHODS In this cross-sectional survey the prevalence, frequency and molecular diversity of S. stercoralis, G. duodenalis, Cryptosporidium spp. and Blastocystis spp. were investigated in a school children population in the province of Benguela (Angola). A total of 351 stool samples were collected during January to June 2015. The presence of S. stercoralis and G. duodenalis was confirmed by qPCR methods. Giardia duodenalis assemblages and sub-assemblages were determined by multilocus sequence-based genotyping of the glutamate dehydrogenase and β-giardin genes of the parasite. Detection and identification of Cryptosporidium and Blastocystis species and subtypes was carried out by amplification and sequencing of a partial fragment of the small-subunit ribosomal RNA gene of both protozoan. Analyses of risk factors potentially associated with the transmission of these pathogens were also conducted. RESULTS Prevalences of S. stercoralis, G. duodenalis, Cryptosporidium spp., and Blastocystis spp. were estimated at 21.4% (95% CI: 17.1-25.7%), 37.9% (95% CI: 32.8-43.0%), 2.9% (95% CI: 1.1-4.5%) and 25.6% (95% CI: 21.18-30.2%), respectively. Overall, 64.1% (225/351) of the children were infected by at least one of the pathogens investigated. Sequence analyses of the 28 G. duodenalis isolates that were successfully genotyped allowed the identification of sub-assemblages AI (14.3%), AII (14.3%), BIII (7.1%) and BIV (25.0%). Discordant typing results AII/AIII and BIII/BIV were identified in 7.1% and 14.3% of the isolates, respectively. A total of five additional isolates (17.9%) were identified as assemblage B. Three Cryptosporidium species including C. hominis (70%), C. parvum (20%) and C. canis (10%) were found circulating in the children population under study. A total of 75 Blastocystis isolates were assigned to the subtypes ST1 (30.7%), ST2 (30.7%), ST3 (36.0%), ST5 (1.3%) and ST7 (1.3%), respectively. Children younger than seven years of age had significantly higher risk of infections by protozoan enteropathogens (PRR: 1.35, P < 0.01), whereas being underweight seemed to have a protective effect against these infections (PRR: 0.74, P = 0.005). CONCLUSIONS The burden of disease attributable to human strongyloidiasis, giardiosis, cryptosporidiosis and blastocystosis in Angola is considerably higher than initially estimated in previous surveys. Surveillance and control of these infections should be jointly tackled with formally considered neglected tropical diseases in order to maximize effort and available resources. Our data also demonstrate the added value of using molecular diagnostic methods in high transmission areas.
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Affiliation(s)
- Elena Dacal
- 0000 0000 9314 1427grid.413448.eParasitology Reference and Research Laboratory, National Centre for Microbiology, Health Institute Carlos III, Ctra. Majadahonda-Pozuelo Km 2, 28220 Majadahonda, Madrid Spain
| | - José M. Saugar
- 0000 0000 9314 1427grid.413448.eParasitology Reference and Research Laboratory, National Centre for Microbiology, Health Institute Carlos III, Ctra. Majadahonda-Pozuelo Km 2, 28220 Majadahonda, Madrid Spain
| | - Aida de Lucio
- 0000 0000 9314 1427grid.413448.eParasitology Reference and Research Laboratory, National Centre for Microbiology, Health Institute Carlos III, Ctra. Majadahonda-Pozuelo Km 2, 28220 Majadahonda, Madrid Spain
| | - Marta Hernández-de-Mingo
- 0000 0000 9314 1427grid.413448.eParasitology Reference and Research Laboratory, National Centre for Microbiology, Health Institute Carlos III, Ctra. Majadahonda-Pozuelo Km 2, 28220 Majadahonda, Madrid Spain
| | - Elena Robinson
- 0000 0000 9314 1427grid.413448.eParasitology Reference and Research Laboratory, National Centre for Microbiology, Health Institute Carlos III, Ctra. Majadahonda-Pozuelo Km 2, 28220 Majadahonda, Madrid Spain
| | - Pamela C. Köster
- 0000 0000 9314 1427grid.413448.eParasitology Reference and Research Laboratory, National Centre for Microbiology, Health Institute Carlos III, Ctra. Majadahonda-Pozuelo Km 2, 28220 Majadahonda, Madrid Spain
| | | | - Mateu Espasa
- 0000 0001 0675 8654grid.411083.fMicrobiology Department, Vall d’Hebron University Hospital, PROSICS Barcelona, Passeig de la Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - Arlette Ninda
- Hospital Nossa Senhora da Paz, Cubal, Benguela, Angola
| | - Javier Gandasegui
- 0000 0001 2180 1817grid.11762.33Biomedical Research Institute of Salamanca - Research Center for Tropical Diseases at the University of Salamanca (IBSAL-CIETUS), Faculty of Pharmacy, University of Salamanca, Paseo de San Vicente 58-182, 37007 Salamanca, Spain
| | - Elena Sulleiro
- 0000 0001 0675 8654grid.411083.fMicrobiology Department, Vall d’Hebron University Hospital, PROSICS Barcelona, Passeig de la Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | | | - Fernando Salvador
- 0000 0001 0675 8654grid.411083.fInfectious Diseases Department, Vall d’Hebron University Hospital, PROSICS Barcelona, Passeig de la Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - Israel Molina
- 0000 0001 0675 8654grid.411083.fInfectious Diseases Department, Vall d’Hebron University Hospital, PROSICS Barcelona, Passeig de la Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - Esperanza Rodríguez
- 0000 0000 9314 1427grid.413448.eParasitology Reference and Research Laboratory, National Centre for Microbiology, Health Institute Carlos III, Ctra. Majadahonda-Pozuelo Km 2, 28220 Majadahonda, Madrid Spain
| | - David Carmena
- 0000 0000 9314 1427grid.413448.eParasitology Reference and Research Laboratory, National Centre for Microbiology, Health Institute Carlos III, Ctra. Majadahonda-Pozuelo Km 2, 28220 Majadahonda, Madrid Spain
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Song JK, Hu RS, Fan XC, Wang SS, Zhang HJ, Zhao GH. Molecular characterization of Blastocystis from pigs in Shaanxi province of China. Acta Trop 2017; 173:130-135. [PMID: 28619673 DOI: 10.1016/j.actatropica.2017.06.014] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 06/08/2017] [Accepted: 06/11/2017] [Indexed: 12/30/2022]
Abstract
Blastocystis is an enteric eukaryote of mystery for its ubiquitous presence in animals and humans worldwide and a broad diversity genetically. The animals have been suggested to be an important reservoir to transmit Blastocystis to humans because of high colonization frequency and the presence of zoonotic subtypes. In the present study, the prevalence and subtypes of Blastocystis in pigs in Shaanxi province of China were determined using the molecular technique based on the small subunit rRNA (SSU rRNA) gene fragment. Of 560 pig faecal samples collected from different geographical origins, 419 (74.8%) were positive for Blastocystis colonization. The prevalence was significant affected by the age and the geographical origin. Four subtypes, including three zoonotic (ST1, ST3 and ST5) and one animal specific (ST10) subtypes, were identified. To our knowledge, this study provides the first run-through information for colonization of Blastocystis in pigs in China.
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Zulfa F, Sari IP, Kurniawan A. Association of Blastocystis subtypes with diarrhea in children. ACTA ACUST UNITED AC 2017. [DOI: 10.1088/1742-6596/884/1/012031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Molecular epidemiology of blastocystosis in Malaysia: does seasonal variation play an important role in determining the distribution and risk factors of Blastocystis subtype infections in the Aboriginal community? Parasit Vectors 2017; 10:360. [PMID: 28760145 PMCID: PMC5537991 DOI: 10.1186/s13071-017-2294-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 07/17/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Alternating wet and dry seasons may play an important role in the acquisition and distribution of Blastocystis subtype infection in the tropics. This cross-sectional study was therefore conducted to provide the prevalence of Blastocystis and to determine the potential risk factors associated with each subtype during the wet and dry seasons in the Aboriginal community, Pahang, Malaysia. METHODS A total of 473 faecal samples were collected: 256 (54.1%) and 217 (45.9%) samples were obtained during the wet (October-November 2014) and the dry season (June 2015), respectively. All fresh faecal samples were subjected to molecular analysis for subtype and allele identification. RESULTS Of the 473 samples, 42.6% and 37.8% were positive for Blastocystis ST1, ST2, ST3 and ST4 during wet and dry seasons, respectively. Prevalence of Blastocystis ST1 was significantly higher during the wet season compared to the dry season (Z = 2.146, P < 0.05). Analysis of the association of each Blastocystis subtype with socioeconomic characteristics showed the presence of other family members infected with Blastocystis ST3 and the use of stored river water for domestic activities were the significant risk factors for Blastocystis ST3 infections during both seasons. Untreated water supply and low monthly household income (less or equal to RM 500) were the other significant risk factors for Blastocystis ST3 infections during wet and dry season, respectively. The presence of other family members with Blastocystis ST1 and ST2 was the only significant risk factor associated with ST1 and ST2 infections during both seasons. We hypothesise that transmission of Blastocystis ST1, ST2 and ST3 occurred from person to person during both seasons. The waterborne transmission was also identified as a mode of transmission of Blastocystis ST3. CONCLUSION The significant risk factors identified in this study were important in the dynamic transmission of Blastocystis infections during both seasons. Provision of treated water supply and health education are affirmative actions to be taken to control Blastocystis infections in this community.
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Blastocystis in Côte d'Ivoire: molecular identification and epidemiological data. Eur J Clin Microbiol Infect Dis 2017; 36:2243-2250. [PMID: 28674969 DOI: 10.1007/s10096-017-3053-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 06/20/2017] [Indexed: 10/19/2022]
Abstract
Blastocystis is an enteric protozoan infecting humans and animals in both developed and developing countries at all latitudes. Despite this, data on Blastocystis infection are not available for several geographical areas, including many African countries. In this study, a survey was conducted on Blastocystis among humans and domestic animals in rural and urban localities in Côte d'Ivoire, in order to investigate the prevalence, the subtype distribution, and the zoonotic potential in association with sociodemographic factors, seasonality, symptoms, and co-infections. A total of 110 fecal samples were collected from patients living in four localities. Molecular and phylogenetic analyses were conducted for Blastocystis detection and subtyping. Positive samples from symptomatic patients were tested by Luminex xTAG® Gastrointestinal Pathogen Panel (GPP) to evidence the presence of other common intestinal pathogens. Overall, a prevalence of 58.2% was observed in humans and subtypes ST1(50.0%), ST2 (22.0%) and ST3 (28.1%) were identified. The prevalence values varied significantly among the sites but not in relation to the subtype. The seasonal rains significantly increase the infection rate in all localities. No significant differences in the ST distribution between asymptomatic and symptomatic subjects were observed. As regard the zoonotic transmission, an additional sampling was conducted in another village where fecal samples were simultaneously collected from humans and animals. Blastocystis STs 1-3 and ST7 were identified in eight humans and four chickens, respectively. This study provides the first exhaustive data on the prevalence and molecular epidemiology of Blastocystis in Côte d'Ivoire.
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Mohamed RT, El-Bali MA, Mohamed AA, Abdel-Fatah MA, El-Malky MA, Mowafy NM, Zaghlool DA, Bakri RA, Al-Harthi SA. Subtyping of Blastocystis sp. isolated from symptomatic and asymptomatic individuals in Makkah, Saudi Arabia. Parasit Vectors 2017; 10:174. [PMID: 28388938 PMCID: PMC5383971 DOI: 10.1186/s13071-017-2114-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 03/27/2017] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND Blastocystis is a group of cosmopolitan gastrointestinal parasite of humans and a wide variety of animals. These anaerobic protozoans include more than 17 specific small-subunit ribosomal RNA subtypes, of which nine are found in humans with a variable geographical distribution. Until now, no study has described the Blastocystis subtypes present in Saudi Arabia. METHODS In total, 1,262 faecal samples were collected from patients with gastrointestinal complaints and asymptomatic individuals visiting two major hospitals. All samples were analysed by F1/R1 diagnostic PCR, microscopy and culture methods. The subtypes of Blastocystis sp. isolates were determined by the sequenced-tagged site (STS)-based method. RESULTS One-hundred-thirty-three positive cases were detected by F1/R1 diagnostic PCR, of which 122 were also positive by the culture method and 83 by direct microscopy. The sensitivities of direct microscopy and the culture method were 62% and 92%, respectively. Subtype (ST3) was the most prevalent (80.5%), followed by ST1 (14.5%) and ST2 (5%). ST4, ST5, ST6 and ST7 were not detected in this study. ST3 infections were significantly predominant (P < 0.05) among symptomatic patients. CONCLUSIONS To our knowledge, this study provides the first run-through information on Blastocystis sp. epidemiology in Makkah city, revealing a rather moderate prevalence of 10.5% and the presence of three subtypes, ST1, ST2, and ST3. ST3 was the most predominant, particularly among symptomatic patients.
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Affiliation(s)
- Raafat T Mohamed
- Department of Medical Parasitology, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia. .,Department of Medical Parasitology, Faculty of Medicine, El-Minia University, El-Minia, Egypt.
| | - Mohammed A El-Bali
- Department of Medical Parasitology, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Anhar A Mohamed
- Department of Medical Parasitology, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia.,Department of Medical Parasitology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Mona A Abdel-Fatah
- Department of Medical Parasitology, Faculty of Medicine, Ain Shams University, Cairo, Egypt.,Microbiology Laboratory, King Abdellah Medical City, Makkah, Saudi Arabia
| | - Mohamed A El-Malky
- Department of Medical Parasitology, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia.,Department of Medical Parasitology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Nawras M Mowafy
- Department of Medical Parasitology, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia.,Department of Medical Parasitology, Faculty of Medicine, El-Minia University, El-Minia, Egypt
| | - Dina A Zaghlool
- Laboratory and Blood Bank Department, Al-Noor Specialist Hospital, Makkah, Saudi Arabia.,Department of Medical Parasitology, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Rowaida A Bakri
- Department of Medical Parasitology, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Saeed A Al-Harthi
- Department of Medical Parasitology, Faculty of Medicine, Umm Al-Qura University, Makkah, Saudi Arabia
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JALALLOU N, IRAVANI S, REZAEIAN M, ALINAGHIZADE A, MIRJALALI H. Subtypes Distribution and Frequency of Blastocystis sp. Isolated from Diarrheic and Non-diarrheic Patients. IRANIAN JOURNAL OF PARASITOLOGY 2017; 12:63-68. [PMID: 28761462 PMCID: PMC5522700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
BACKGROUND Blastocystis is one of the most common parasites, reported from both human and animals. This parasite is more prevalent in regions with low levels of hygiene, close contact with animal and unsuitable disposal systems. The aim of the study was to subtype Blastocystis sp., isolated from diarrheic and non-diarrheic patients using sequencing of 18S ribosomal DNA. METHODS Totally, 300 stool samples were collected from diarrheic and nondiarrheic patients referred to Imam Reza Hospital, Tehran from Apr to Aug 2015. All samples were concentrated using conventional Formalin - ether technique and recognized under light microscope. The fresh stool samples were also cultivated in clotted fetal bovine medium and examined for growing of Blastocystis every 48 h with direct smear slides for 10 d. DNA extraction was performed on all positive samples. Amplified DNA fragment of 18S rDNA was sequenced and compared with reference genes, previously deposited in Genbank database. RESULTS The number of diarrheic and non-diarrheic patients participated in the study was 134 (44.66%) and 166 (55.34%), respectively. Three subtypes 1, 2, 3 were identified from positive samples. Subtype 2 was the most prevalent (36.5%) followed by subtype 1 (33.3%) and subtype 3 (30.2%). There were no mixed subtypes. Furthermore, the most prevalent subtypes in diarrheic and non-diarrheic patients were subtype 2 (39.28%) and subtype 1 (37.14%), respectively. CONCLUSION Blastocystis sp., is one of the most prevalent unicellular parasites among diarrheic and non-diarrheic patients. Indeed, ST2 was the most prevalent subtype particularly in those samples collected from diarrheic patients.
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Affiliation(s)
- Nahid JALALLOU
- Dept. of Laboratory Sciences, School of Paramedicine, AJA University, Tehran, Iran
| | - Shahrokh IRAVANI
- AJA Cancer Research Center (ACRC), AJA University of Medical Sciences, Tehran, Iran
| | - Mostafa REZAEIAN
- Dept. of Medical Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Atefe ALINAGHIZADE
- Dept. of Medical Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Hamed MIRJALALI
- Dept. of Laboratory Sciences, School of Paramedicine, AJA University, Tehran, Iran, Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran,Correspondence
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Salehi R, Haghighi A, Stensvold CR, Kheirandish F, Azargashb E, Raeghi S, Kohansal C, Bahrami F. Prevalence and subtype identification of Blastocystis isolated from humans in Ahvaz, Southwestern Iran. GASTROENTEROLOGY AND HEPATOLOGY FROM BED TO BENCH 2017; 10:235-241. [PMID: 29118941 PMCID: PMC5660275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
AIM The aim of the present study was to determine the prevalence and subtype distribution of Blastocystis and its relation with demographic data and symptoms in humans referred to medical centers in Ahvaz 2014-2015. BACKGROUND Infections with intestinal parasites are one of the most important threats to human health worldwide, especially in tropical and subtropical areas. Blastocystis sp. is a common parasite of humans with a vast variety of non-human hosts. We aimed to study the prevalence and subtypes of Blastocystis sp. in individuals referred to medical laboratories in Ahvaz city, southwest Iran. METHODS From September 2014 to September 2015, 618 stool samples were collected from 16 medical laboratories in Ahvaz, and examined using direct wet mount, formalin-ether concentration, a modified version of the Ziehl-Neelsen staining technique, and cultivation in xenic HSr + S medium. Subtypes of positive Blastocysts sp. were obtained using the "barcoding" method. The results were analyzed using SPSS software, version 16, with Chi-square and Fisher's exact test. RESULTS Totally, 325 (52.6%) of the referred individuals were men and 293 (47.4%) were women. Blastocystis sp. was observed in 146 (23.6%) samples. Co-infections with other intestinal parasites were found in 32 (5.17%) cases. Out of the 146 positive isolates, 20.83%, 20.83% and 58.34% belonged to ST1, ST2, ST3 respectively. CONCLUSION Blastocystis sp. was quite common in the study population, with a carrier rate corresponding to nearly one in every four individuals. The subtype distribution identified in the present study was largely identical to that reported from other studies in Iran, with ST3 being the most common.
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Affiliation(s)
- Roya Salehi
- International Branch, Shahid Beheshti University of Medical Sciences, Tehran, Iran,Department of Medical Parasitology and Mycology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ali Haghighi
- Department of Medical Parasitology and Mycology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - C. Rune Stensvold
- Department of Microbiology and Infection Control, Statens Serum Institute, Artillerivej 5, DK-2300 Copenhagen S, Denmark
| | - Farnaz Kheirandish
- Department of Medical Parasitology and Mycology, School of Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Eznelloah Azargashb
- Department of Community Medicine, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Saber Raeghi
- Department of Laboratory Science, Faculty of Paramedical Sciences, Maragheh, Iran.
| | - Cobra Kohansal
- Department of Medical Parasitology, School of Medicine, Jondishapour University of Medical Sciences, Ahvaz,Iran
| | - Fares Bahrami
- Department of Medical Parasitology and Mycology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Ben Abda I, Maatoug N, Ben Romdhane R, Bouhelmi N, Zallegua N, Aoun K, Viscogliosi E, Bouratbine A. Prevalence and Subtype Identification of Blastocystis sp. in Healthy Individuals in the Tunis Area, Tunisia. Am J Trop Med Hyg 2016; 96:202-204. [PMID: 27920396 DOI: 10.4269/ajtmh.16-0506] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 09/07/2016] [Indexed: 11/07/2022] Open
Abstract
Blastocystis sp. is currently the most common eukaryotic parasite found in humans. Despite its potential public health impact, epidemiological data regarding its prevalence and molecular subtype (ST) distribution in Maghreb are rarely reported. Therefore, the aim of this study was to determine the prevalence of the parasite in a cohort of healthy food handler Tunisian individuals and to acquire the first molecular data regarding the distribution of Blastocystis sp. STs in this country. Therefore, 524 fecal samples were collected, and 68 of them (13%) were identified as positive for the parasite by direct-light microscopy of smears. Seventeen samples of 100 negative by microscopy were also shown to be positive by real-time quantitative polymerase chain reaction. Among all the positive samples, 61 Blastocystis isolates were subtyped using partial small subunit ribosomal RNA gene analysis. ST3 was the most abundant (51%) followed by ST1 (30%), ST2 (16%), and ST4 and ST7 (both 1.6%).
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Affiliation(s)
- Imène Ben Abda
- Research Laboratory of Medical Parasitology, Biotechnology and Biomolecules (PMBB), Institut Pasteur of Tunis, Tunis, Tunisia.,Department of Parasitology, Institut Pasteur of Tunis, Tunis, Tunisia
| | - Nabil Maatoug
- Research Laboratory of Medical Parasitology, Biotechnology and Biomolecules (PMBB), Institut Pasteur of Tunis, Tunis, Tunisia.,Department of Parasitology, Institut Pasteur of Tunis, Tunis, Tunisia
| | - Rania Ben Romdhane
- Research Laboratory of Medical Parasitology, Biotechnology and Biomolecules (PMBB), Institut Pasteur of Tunis, Tunis, Tunisia
| | - Nada Bouhelmi
- Department of Parasitology, Institut Pasteur of Tunis, Tunis, Tunisia
| | - Najet Zallegua
- Department of Parasitology, Institut Pasteur of Tunis, Tunis, Tunisia
| | - Karim Aoun
- Research Laboratory of Medical Parasitology, Biotechnology and Biomolecules (PMBB), Institut Pasteur of Tunis, Tunis, Tunisia.,Department of Parasitology, Institut Pasteur of Tunis, Tunis, Tunisia
| | - Eric Viscogliosi
- Centre d'Infection et d'Immunité de Lille, Institut Pasteur de Lille, Université de Lille, Lille, France
| | - Aïda Bouratbine
- Research Laboratory of Medical Parasitology, Biotechnology and Biomolecules (PMBB), Institut Pasteur of Tunis, Tunis, Tunisia. .,Department of Parasitology, Institut Pasteur of Tunis, Tunis, Tunisia
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Dogan N, Aydin M, Tuzemen NU, Dinleyici EC, Oguz I, Dogruman-Al F. Subtype distribution of Blastocystis spp. isolated from children in Eskisehir, Turkey. Parasitol Int 2016; 66:948-951. [PMID: 27989831 DOI: 10.1016/j.parint.2016.10.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Revised: 09/04/2016] [Accepted: 10/17/2016] [Indexed: 12/11/2022]
Abstract
Blastocystis spp. is the most common enteric protist found in human feces. The pathogenic role of Blastocystis remains controversial and it has been suggested that the symptomatology of Blastocystis is associated with its subtypes (ST). However, only few studies have investigated the relationship between the symptomatology and subtypes of Blastocystis in children. This study aimed to investigate the prevalence of Blastocystis in children aged 3 to 13years with or without gastrointestinal complaints and determine the distribution of the subtypes of Blastocystis. A total of 303 stool samples obtained from symptomatic (n=84) and asymptomatic (n=219) children were included in the study. The presence of Blastocystis was investigated using native-lugol examination, trichrome staining and real-time PCR method. Using the real-time PCR method, 115 samples were found positive for Blastocystis. Subtyping was successfully performed on 46 samples using sequenced-tagged site (STS) primers and PCR. The remaining 69 samples could not be subtyped. The most frequently detected subtype was ST3 (43.4%) followed by ST1 (26.1%), ST4 (10.9%) and ST2 (8.7%). The mixed subtypes were identified in five samples (10.9%) as; ST1+ST3 (n=3), ST1+ST2 (n=1) and ST2+ST3 (n=1). None of the samples had ST5, ST6 or ST7. No statistically significant difference was found between the symptomatic and asymptomatic groups in terms of the Blastocystis positivity and the distribution of subtypes (p>0.05). To our knowledge, this is the first study to investigate the subtype distribution of Blastocystis in children in Turkey and the results are in agreement with the related data available in Turkey.
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Affiliation(s)
- Nihal Dogan
- Department of Medical Microbiology, Faculty of Medicine, Eskisehir Osmangazi University, Eskisehir, Turkey.
| | - Merve Aydin
- Department of Medical Microbiology, Faculty of Medicine, Erzincan University, Erzincan, Turkey
| | - Nazmiye Ulku Tuzemen
- Department of Medical Microbiology, Faculty of Medicine, Eskisehir Osmangazi University, Eskisehir, Turkey
| | - Ener Cagri Dinleyici
- Department of Pediatric Intensive Care, Faculty of Medicine, Eskisehir Osmangazi University, Eskisehir, Turkey
| | - Ilkiz Oguz
- Department of Medical Microbiology, Faculty of Medicine, Gazi University, Ankara, Turkey
| | - Funda Dogruman-Al
- Department of Medical Microbiology, Faculty of Medicine, Gazi University, Ankara, Turkey
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Ajjampur SSR, Png CW, Chia WN, Zhang Y, Tan KSW. Ex Vivo and In Vivo Mice Models to Study Blastocystis spp. Adhesion, Colonization and Pathology: Closer to Proving Koch's Postulates. PLoS One 2016; 11:e0160458. [PMID: 27508942 PMCID: PMC4979897 DOI: 10.1371/journal.pone.0160458] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 07/19/2016] [Indexed: 12/22/2022] Open
Abstract
Blastocystis spp. are widely prevalent extra cellular, non-motile anerobic protists that inhabit the gastrointestinal tract. Although Blastocystis spp. have been associated with gastrointestinal symptoms, irritable bowel syndrome and urticaria, their clinical significance has remained controversial. We established an ex vivo mouse explant model to characterize adhesion in the context of tissue architecture and presence of the mucin layer. Using confocal microscopy with tissue whole mounts and two axenic isolates of Blastocystis spp., subtype 7 with notable differences in adhesion to intestinal epithelial cells (IEC), isolate B (ST7-B) and isolate H (more adhesive, ST7-H), we showed that adhesion is both isolate dependent and tissue trophic. The more adhesive isolate, ST7-H was found to bind preferentially to the colon tissue than caecum and terminal ileum. Both isolates were also found to have mucinolytic effects. We then adapted a DSS colitis mouse model as a susceptible model to study colonization and acute infection by intra-caecal inoculation of trophic Blastocystis spp.cells. We found that the more adhesive isolate ST7-H was also a better colonizer with more mice shedding parasites and for a longer duration than ST7-B. Adhesion and colonization was also associated with increased virulence as ST7-H infected mice showed greater tissue damage than ST7-B. Both the ex vivo and in vivo models used in this study showed that Blastocystis spp. remain luminal and predominantly associated with mucin. This was further confirmed using colonic loop experiments. We were also successfully able to re-infect a second batch of mice with ST7-H isolates obtained from fecal cultures and demonstrated similar histopathological findings and tissue damage thereby coming closer to proving Koch’s postulates for this parasite.
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Affiliation(s)
- Sitara S. R. Ajjampur
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, National University of Singapore, 5 Science Drive 2, Singapore, 117545
| | - Chin Wen Png
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, National University of Singapore, 5 Science Drive 2, Singapore, 117545
| | - Wan Ni Chia
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, National University of Singapore, 5 Science Drive 2, Singapore, 117545
| | - Yongliang Zhang
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, National University of Singapore, 5 Science Drive 2, Singapore, 117545
| | - Kevin S. W. Tan
- Laboratory of Molecular and Cellular Parasitology, Department of Microbiology and Immunology, National University of Singapore, 5 Science Drive 2, Singapore, 117545
- * E-mail:
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Prevalence and Genotype Analysis of Blastocystis hominis in Iran: A Systematic Review and Meta-Analysis. ARCHIVES OF CLINICAL INFECTIOUS DISEASES 2016. [DOI: 10.5812/archcid.36648] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Forsell J, Granlund M, Samuelsson L, Koskiniemi S, Edebro H, Evengård B. High occurrence of Blastocystis sp. subtypes 1-3 and Giardia intestinalis assemblage B among patients in Zanzibar, Tanzania. Parasit Vectors 2016; 9:370. [PMID: 27356981 PMCID: PMC4928263 DOI: 10.1186/s13071-016-1637-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 06/10/2016] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Blastocystis is a common intestinal parasite with worldwide distribution but the distribution of Blastocystis and its subtypes in East Africa is largely unknown. In this study, we investigate the distribution of Blastocystis subtypes in Zanzibar, Tanzania and report the prevalence of intestinal parasites using both molecular methods and microscopy. METHODS Stool samples were collected from both diarrhoeic and non-diarrhoeic outpatients in Zanzibar. In addition to microscopy, real-time PCR for Blastocystis, Entamoeba histolytica and E. dispar, Giardia intestinalis, Cryptosporidium spp., and Dientamoeba fragilis was used. Blastocystis subtypes were determined by a conventional PCR followed by partial sequencing of the SSU-rRNA gene. Genetic assemblages of Giardia were determined by PCR with assemblage specific primers. RESULTS Intestinal parasites were detected in 85 % of the 174 participants, with two or more parasites present in 56 %. Blastocystis sp. and Giardia intestinalis were the most common parasites, identified by PCR in 61 and 53 % of the stool samples respectively, but no correlation between carriage of Blastocystis and Giardia was found. The Blastocystis subtype distribution was ST1 34.0 %, ST2 26.4 %, ST3 25.5 %, ST7 0.9 %, and 13.2 % were positive only by qPCR (non-typable). The Giardia genetic assemblages identified were A 6.5 %, B 85 %, A + B 4.3 %, and non-typable 4.3 %. The detection rate with microscopy was substantially lower than with PCR, 20 % for Blastocystis and 13.8 % for Giardia. The prevalence of Blastocystis increased significantly with age while Giardia was most prevalent in children two to five years old. No correlation between diarrhoea and the identification of Giardia, Blastocystis, or their respective genetic subtypes could be shown and, as a possible indication of parasite load, the mean cycle threshold values in the qPCR for Giardia were equal in diarrhoeic and non-diarrhoeic patients. CONCLUSIONS Carriage of intestinal parasites was very common in the studied population in Zanzibar. The most commonly detected parasites, Blastocystis and Giardia, had different age distributions, possibly indicating differences in transmission routes, immunity, and/or other host factors for these two species. In the Blastocystis subtype analysis ST1-3 were common, but ST4, a subtype quite common in Europe, was completely absent, corroborating the geographical differences in subtype distributions previously reported.
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Affiliation(s)
- Joakim Forsell
- Division of Clinical Bacteriology, Department of Clinical Microbiology, Umeå University, SE-901 87, Umeå, Sweden.
| | - Margareta Granlund
- Division of Clinical Bacteriology, Department of Clinical Microbiology, Umeå University, SE-901 87, Umeå, Sweden
| | - Linn Samuelsson
- Division of Clinical Bacteriology, Department of Clinical Microbiology, Umeå University, SE-901 87, Umeå, Sweden
| | - Satu Koskiniemi
- Division of Clinical Bacteriology, Department of Clinical Microbiology, Umeå University, SE-901 87, Umeå, Sweden
| | - Helén Edebro
- Division of Clinical Bacteriology, Department of Clinical Microbiology, Umeå University, SE-901 87, Umeå, Sweden
| | - Birgitta Evengård
- Division of Infectious Diseases, Department of Clinical Microbiology, Umeå University, SE-901 87, Umeå, Sweden
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Subtype analysis of Blastocystis sp. isolates from human and canine hosts in an urban community in the Philippines. Parasitol Int 2016; 65:291-4. [DOI: 10.1016/j.parint.2016.02.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 02/11/2016] [Accepted: 02/15/2016] [Indexed: 11/20/2022]
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Predominance of Blastocystis sp. Infection among School Children in Peninsular Malaysia. PLoS One 2016; 11:e0136709. [PMID: 26914483 PMCID: PMC4767405 DOI: 10.1371/journal.pone.0136709] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 08/08/2015] [Indexed: 01/01/2023] Open
Abstract
Background One of the largest cross-sectional study in recent years was carried out to investigate the prevalence of intestinal parasitic infections among urban and rural school children from five states namely Selangor, Perak, Pahang, Kedah and Johor in Peninsula Malaysia. This information would be vital for school authorities to influence strategies for providing better health especially in terms of reducing intestinal parasitism. Methods and Principal Findings A total of 3776 stool cups was distributed to 26 schools throughout the country. 1760 (46.61%) responded. The overall prevalence of intestinal parasitic infection in both rural and urban areas was 13.3%, with Blastocystis sp (10.6%) being the most predominant, followed by Trichuris trichiura (3.4%), Ascaris lumbricoides (1.5%) and hook worm infection (0.9%). Only rural school children had helminthic infection. In general Perak had the highest infection (37.2%, total, n = 317), followed by Selangor (10.4%, total, n = 729), Pahang (8.6%, total, n = 221), Kedah (6.2%, total, n = 195) and Johor (3.4%, total, n = 298). School children from rural schools had higher infection (13.7%, total, n = 922) than urban school children (7.2%, total, n = 838). Subtype (ST) 3 (54.3%) is the most predominant ST with persons infected with only ST1 and ST3 showing symptoms. Blastocystis sp infection significantly associated with low household income, low parent’s education and presence of symptoms (p<0.05). Conclusion It is critical that we institute deworming and treatment to eradicate the parasite especially in rural school children.
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Azizian M, Basati G, Abangah G, Mahmoudi MR, Mirzaei A. Contribution of Blastocystishominis subtypes and associated inflammatory factors in development of irritable bowel syndrome. Parasitol Res 2016; 115:2003-9. [DOI: 10.1007/s00436-016-4942-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2015] [Accepted: 01/26/2016] [Indexed: 01/01/2023]
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Abu-Madi M, Aly M, Behnke JM, Clark CG, Balkhy H. The distribution of Blastocystis subtypes in isolates from Qatar. Parasit Vectors 2015; 8:465. [PMID: 26384209 PMCID: PMC4573284 DOI: 10.1186/s13071-015-1071-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2015] [Accepted: 09/03/2015] [Indexed: 11/12/2022] Open
Abstract
Background Blastocystis is a common single-celled intestinal parasite of humans and other animals comprising at least 17 genetically distinct small subunit ribosomal RNA lineages (subtypes (STs)), nine of which have been found in humans. The geographic distribution of Blastocystis subtypes is variable, but the subtypes present in Qatar are at present unknown. Methods Stool samples were collected from randomly selected, apparently healthy subjects arriving in Qatar for the first time. Blastocystis subtypes were determined by sequencing of the small subunit rRNA gene (SSU rDNA) PCR products. Phylogenetic analyses were done using Maximum Composite Likelihood method. Results 71.1 % of samples were positive for Blastocystis infection based on PCR-detection methodology compared to only 6.9 % by microscopy. Prevalence of Blastocystis did not differ between the sexes nor between age classes. However, there was a regional difference in prevalence with subjects arriving from Africa showing the highest (87.6 %), those from Western Asia intermediate (68.6 %) and from Eastern Asia the lowest prevalence (67.6 %). Genetic analysis detected only three STs. ST3 was the most common (69.3 %) and ST2 was the rarest (3.5 %), while ST1 had a prevalence of 27.2 %. ST2 showed a regional variation, being absent from the 64 Western Asian Blastocystis-positive subjects. Both ST1 and ST3 showed significant differences in prevalence between the sexes. Conclusions This is the first report exploring the distribution of Blastocystis subtypes in our region. We recommend that stool screening via microscopy for the presence of Blastocystis should be abandoned since it is extremely insensitive. In future, the prevalence of Blastocystis infections should be based on PCR methodology and we predict that in the years ahead diagnostic PCR will become the tool of choice. More work is needed to identify the full range of Blastocystis subtypes that circulate in our region.
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Affiliation(s)
- Marawan Abu-Madi
- Department of Health Sciences, College of Arts and Science, Biomedical Research Center, Qatar University, P.O. Box 2713, Doha, Qatar.
| | - Mahmoud Aly
- King Abdullah International Medical Research Center, National Guard Health Affairs, Mail Code: 2216, P.O. Box 22490, Riyadh, 11426, KSA. .,King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia.
| | - Jerzy M Behnke
- School of Life Sciences, University of Nottingham, University Park, Nottingham, United Kingdom, NG7 2RD.
| | - C Graham Clark
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, WC1E 7HT, London, United Kingdom.
| | - Hanan Balkhy
- King Abdullah International Medical Research Center, National Guard Health Affairs, Mail Code: 2216, P.O. Box 22490, Riyadh, 11426, KSA. .,King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia.
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Fréalle E, El Safadi D, Cian A, Aubry E, Certad G, Osman M, Wacrenier A, Dutoit E, Creusy C, Dubos F, Viscogliosi E. Acute blastocystis-associated appendicular peritonitis in a child, Casablanca, Morocco. Emerg Infect Dis 2015; 21:91-4. [PMID: 25528951 PMCID: PMC4285265 DOI: 10.3201/eid2101.140544] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Despite increasing reports that Blastocystis infection is associated with digestive symptoms, its pathogenicity remains controversial. We report appendicular peritonitis in a 9-year-old girl returning to France from Morocco. Only Blastocystis parasites were detected in stools, appendix, peritoneal liquid, and recto-uterine pouch. Simultaneous gastroenteritis in 26 members of the child's family suggested an outbreak.
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