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Parasite ; 28: 53, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34142955


Taeniasis remains a prevalent public health problem in Thailand. National helminthiasis surveys report only the incidence of Taenia spp. eggs. The ability to differentiate Taenia species using morphological and molecular techniques is vital for epidemiological surveys. This study detected taeniasis carriers and other helminthic infections by Kato's thick smear technique and identified the Taenia species by multiplex PCR. The study subjects were the ethnic Karen people in Tha Song Yang District, Tak Province, Thailand, bordering Myanmar. In total, 983 faecal samples from villagers were examined for helminthiases. Interview-based questionnaires were used to gather information on possible risk factors for infection. The prevalence of helminth infections was 42.7% (420/983), including single (37.3%, 367/983) and mixed infections (5.4%, 53/983). The most common infection (19.23%, 189/983) was Ascaris lumbricoides, whereas taeniasis carriers comprised 2.8% (28/983). Multiplex PCR of Cox1 was used for species identification of Taenia tapeworms, eggs, or both in 22 taeniasis carriers. Most of the parasites (20 cases) were Taenia solium, with two cases of Taenia saginata. Taenia saginata asiatica was not found in the villagers examined. The analysis of 314 completed questionnaires showed that a statistically significant (p < 0.05) risk of taeniasis was correlated with being male, a history of being allowed to forage during childhood, a history of seeing tapeworm proglottids, and a history of raw or undercooked pork consumption. Health education programmes must seek to reduce and prevent reinfection in these communities.

Taenia , Teníase , Animais , Humanos , Masculino , Mianmar , Prevalência , Fatores de Risco , Teníase/epidemiologia , Tailândia/epidemiologia
Parasit Vectors ; 13(1): 416, 2020 Aug 12.
Artigo em Inglês | MEDLINE | ID: mdl-32787935


BACKGROUND: Under-regulated national borders in Southeast Asia represent potential regions for enhanced parasitic helminth transmission and present barriers to helminthiasis disease control. METHODS: Three Thailand border regions close to Myanmar, Laos and Cambodia were surveyed for clinical parasitic helminth disease. In-field microscopy was performed on stools from 567 individuals. Sub-samples were transported to Bangkok for molecular analysis comprising three multiplex qPCR assays. RESULTS: The overall helminth infection prevalence was 17.99% as assessed by Kato-Katz and 24.51% by qPCR. The combined prevalence of the two methods was 28.57%; the most predominant species detected were Opisthorchis viverrini (18.34%), hookworm (6.88%; Ancylostoma spp. and Necator americanus), Ascaris lumbricoides (2.29%) and Trichuris trichiura (1.76%). CONCLUSIONS: These data demonstrate the value of molecular diagnostics for determining more precise prevalence levels of helminthiases in Southeast Asia. Availability of such accurate prevalence information will help guide future public health initiatives and highlights the need for more rigorous surveillance and timely intervention in these regions.

Helmintíase/epidemiologia , Helmintos/isolamento & purificação , Prevalência , Ancylostoma/isolamento & purificação , Ancylostomatoidea/isolamento & purificação , Animais , Ascaris lumbricoides/isolamento & purificação , Ásia Sudeste/epidemiologia , Fezes/parasitologia , Feminino , Humanos , Masculino , Necator americanus/isolamento & purificação , Opisthorchis/isolamento & purificação , Patologia Molecular , Reação em Cadeia da Polimerase em Tempo Real , Tailândia/epidemiologia , Trichuris/isolamento & purificação
Parasitology ; 147(9): 972-984, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32364103


Gastrointestinal helminth infection likely affects the gut microbiome, in turn affecting host health. To investigate the effect of intestinal parasite status on the gut microbiome, parasitic infection surveys were conducted in communities in Nan Province, Thailand. In total, 1047 participants submitted stool samples for intestinal parasite examination, and 391 parasite-positive cases were identified, equating to an infection prevalence of 37.3%. Intestinal protozoan species were less prevalent (4.6%) than helminth species. The most prevalent parasite was the minute intestinal fluke Haplorchis taichui (35.9%). Amplicon sequencing of 16S rRNA was conducted to investigate the gut microbiome profiles of H. taichui-infected participants compared with those of parasite-free participants. Prevotella copri was the dominant bacterial operational taxonomic unit (OTU) in the study population. The relative abundance of three bacterial taxa, Ruminococcus, Roseburia faecis and Veillonella parvula, was significantly increased in the H. taichui-infected group. Parasite-negative group had higher bacterial diversity (α diversity) than the H. taichui-positive group. In addition, a significant difference in bacterial community composition (ß diversity) was found between the two groups. The results suggest that H. taichui infection impacts the gut microbiome profile by reducing bacterial diversity and altering bacterial community structure in the gastrointestinal tract.

Bactérias/isolamento & purificação , Microbioma Gastrointestinal , Enteropatias Parasitárias/complicações , População Rural , Trematódeos/fisiologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Animais , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Recém-Nascido , Masculino , Pessoa de Meia-Idade , Tailândia , Adulto Jovem
Korean J Parasitol ; 58(1): 57-60, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32145728


During the mobile clinic activities in Tak Province, Thailand, Paragonimus sp. eggs were found in a fecal sample of a 72-year-old Karen resident. Paragonimus DNA was amplified from the stool sample and identified to P. heterotremus. The patient did not have any symptoms. Apparent pulmonary lesion was not found on the chest X-ray. The patient admitted habitual consumption of semi-cooked or roasted waterfall crabs for several years. The waterfall crabs collected from stream near the village were found negative for Paragonimus metacercariae. In northern Thailand, paragonimiasis remains as one of the public health concerns and should be ruled out for asymptomatic pulmonary patients.

Infecções Assintomáticas , Paragonimíase/parasitologia , Idoso , Animais , Fezes/parasitologia , Humanos , Masculino , Paragonimus/isolamento & purificação , Tailândia
Parasitol Int ; 60(4): 503-6, 2011 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-21946336


Six species of heterophyid intestinal flukes (HIFs) constitute the major endemic zoonotic fish-borne pathogens in Asia: Haplorchis taichui, H. pumilio, H. yokogawai, Procerovum varium, Stellantchasmus falcatus, and Centrocestus formosanus. Several different species of these parasites are often found co-infecting the same second intermediate fish host. Because of their morphological similarities, differentiating between species of HIF metacercariae is difficult, time-consuming, and frequently results in misidentification. In this study, we aimed to develop an efficient and accurate method of identifying metacercariae of these 6 HIFs. Metacercariae were roughly grouped together, based on morphological characteristics seen under a stereomicroscope. Then, PCR-restriction fragment length polymorphism (PCR-RFLP) was used to identify the exact species of each metacercaria, using the 28S ribosomal RNA gene as the genetic marker and MboII as the restriction enzyme. Using a combination of morphological and molecular methods eliminates the need for DNA sequencing and infecting animal subjects to obtain adult worms, increases accuracy, and decreases the need for laborious morphological identification. Because the method is simple, rapid, and relatively cheap compared with PCR-sequencing, it may be an effective tool for epidemiological studies of HIFs in endemic areas.

Doenças dos Peixes/diagnóstico , Heterophyidae/genética , Intestinos/parasitologia , Metacercárias/genética , Polimorfismo de Fragmento de Restrição , Infecções por Trematódeos/diagnóstico , Infecções por Trematódeos/veterinária , Animais , Ásia/epidemiologia , Desoxirribonucleases de Sítio Específico do Tipo II/genética , Desoxirribonucleases de Sítio Específico do Tipo II/metabolismo , Doenças dos Peixes/epidemiologia , Doenças dos Peixes/parasitologia , Peixes , Água Doce/parasitologia , Heterophyidae/classificação , Heterophyidae/isolamento & purificação , Heterophyidae/patogenicidade , Humanos , Metacercárias/classificação , Metacercárias/isolamento & purificação , Metacercárias/patogenicidade , Microscopia , Reação em Cadeia da Polimerase/métodos , RNA Ribossômico 28S/análise , RNA Ribossômico 28S/genética , Infecções por Trematódeos/epidemiologia , Infecções por Trematódeos/parasitologia
Artigo em Inglês | MEDLINE | ID: mdl-22299460


Hookworm infection is associated with anemia, especially among children and deworming can improve anemic status; however, little information is available about the degree to which anemia improves after deworming. We chose hookworm-endemic rural areas of Thailand, Nan Province in the north, Kanchanaburi Province in the west and Nakhon Si Thammarat Province in the south, to evaluate this problem. Subjects were selected by primary school-based stool egg examinations. Blood tests of 182 hookworm-positive primary school children, composed of 22 heavy, 65 moderate and 95 light infections, were compared with a control group of 57 children who were helminth-free both before and after receiving deworming medicine. Before deworming, the red blood cell (RBC), hemoglobin (Hb), hematocrit (Hct), mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC) and albumin levels of the hookworm-infected groups were significantly lower than the helminth-free control group. The Hb and Hct levels showed an inverse relationship with intensity of hookworm infection. After deworming, the Hb, Hct, total protein and albumin levels of the hookworm-infected children improved within 2 months to become comparable with the helminth-free control group. One year after deworming, the mean blood test results in the 2 groups were not significantly different from each other.

Anemia/fisiopatologia , Infecções por Uncinaria/tratamento farmacológico , Estado Nutricional , Adolescente , Albendazol/uso terapêutico , Anemia/epidemiologia , Anemia/etiologia , Anti-Helmínticos/uso terapêutico , Criança , Pré-Escolar , Doenças Endêmicas , Feminino , Infecções por Uncinaria/complicações , Infecções por Uncinaria/epidemiologia , Humanos , Masculino , Mebendazol/uso terapêutico , Inquéritos Nutricionais , População Rural , Tailândia/epidemiologia