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Siqueira LMV, Senra C, de Oliveira ÁA, Carneiro NFDF, Gomes LI, Rabello A, Coelho PMZ, Oliveira E. A Real-Time PCR Assay for the Diagnosis of Intestinal Schistosomiasis and Cure Assessment After the Treatment of Individuals With Low Parasite Burden. Front Immunol 2021; 11:620417. [PMID: 33815351 PMCID: PMC8010660 DOI: 10.3389/fimmu.2020.620417] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 12/24/2020] [Indexed: 01/02/2023] Open
Abstract
The laboratorial diagnosis of the intestinal schistosomiasis is always performed using Kato-Katz technique. However, this technique presents low sensitivity for diagnosis of individuals with low parasite burden, which constitutes the majority in low endemicity Brazilian locations for the disease. The objective of this study was developed and to validate a real-time PCR assay (qPCR) targeting 121 bp sequence to detect Schistosoma spp. DNA for the diagnosis of intestinal schistosomiasis and a sequence of the human β-actin gene as internal control. Firstly, the qPCR was standardized and next it was evaluated for diagnosis and cure assessment of intestinal schistosomiasis in the resident individuals in Tabuas and Estreito de Miralta, two locations in Brazil endemic for intestinal schistosomiasis. The qPCR assay results were compared with those of the Kato-Katz (KK) test, examining 2 or 24 slides, Saline Gradient (SG) and “reference test” (24 KK slides + SG). The cure assessment was measured by these diagnostic techniques at 30, 90, and 180 days post-treatment. In Tabuas, the positivity rates obtained by the qPCR was 30.4% (45/148) and by “reference test” was of 31.0% (46/148), with no statistical difference (p = 0.91). The presumed cure rates at 30, 90, and 180 days post-treatment were 100, 94.4, and 78.4% by the analysis of 24 KK slides, 100, 94.4, and 78.4% by the SG, and 100, 83.3, and 62.1% by the qPCR assay. In Estreito de Miralta, the positivity obtained by qPCR was 18.3% (26/142) and with “reference test” was 24.6% (35/142), with no statistical difference (p = 0.20). The presumed cure rates were 93.3, 96.9, and 96.5% by the KK, 93.3, 96.9, and 100% by the SG, and 93.3, 93.9, and 96.5% by the qPCR at 30, 90, and 180 days post-treatment, respectively. This study showed that the diagnostic techniques presented different performance in the populations from the two districts (Tabuas and Estreito de Miralta) and reinforces the need of combining techniques to improve diagnosis accuracy, increasing the detection of individuals with low parasite burden. This combination of techniques consists an important strategy for controlling the disease transmission.
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Affiliation(s)
- Liliane Maria Vidal Siqueira
- Diagnosis and Therapy of Infectious and Oncologic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation, Belo Horizonte, Brazil
| | - Carolina Senra
- Clinical Research and Public Politics in Infectious and Parasitic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation, Belo Horizonte, Brazil
| | - Áureo Almeida de Oliveira
- Diagnosis and Therapy of Infectious and Oncologic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation, Belo Horizonte, Brazil
| | | | - Luciana Inácia Gomes
- Clinical Research and Public Politics in Infectious and Parasitic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation, Belo Horizonte, Brazil
| | - Ana Rabello
- Clinical Research and Public Politics in Infectious and Parasitic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation, Belo Horizonte, Brazil
| | - Paulo Marcos Zech Coelho
- Diagnosis and Therapy of Infectious and Oncologic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation, Belo Horizonte, Brazil
| | - Edward Oliveira
- Clinical Research and Public Politics in Infectious and Parasitic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation, Belo Horizonte, Brazil
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Senra C, Gomes LI, Siqueira LMV, Coelho PMZ, Rabello A, Oliveira E. Development of a laboratorial platform for diagnosis of schistosomiasis mansoni by PCR-ELISA. BMC Res Notes 2018; 11:455. [PMID: 29996913 PMCID: PMC6042422 DOI: 10.1186/s13104-018-3571-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 07/06/2018] [Indexed: 11/10/2022] Open
Abstract
Objective We developed a laboratorial platform to release a commercial platform used in the PCR-ELISA for the molecular diagnosis of schistosomiasis mansoni. On following, PCR-ELISA platform laboratorial was evaluated in 206 feces samples collected of individual living in a Brazilian low endemicity area. Results The PCR-ELISA laboratorial platform indicated a prevalence rate of 25.2%, which was higher than the Kato-Katz technique (18.4%) and lower than the commercial platform (30.1%). Considering Kato-Katz technique as the reference, there were 97.4% and 91.1% of relative sensitivity and specificity rates, respectively. The laboratorial platform presented good precision, performance diagnostic, and can be used in replacement to the commercial platform for diagnosis of schistosomiasis by PCR-ELISA. Electronic supplementary material The online version of this article (10.1186/s13104-018-3571-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Carolina Senra
- Clinical Research and Public Politics in Infectious and Parasitic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation (IRR/FIOCRUZ), Av. Augusto de Lima, 1715, Belo Horizonte, MG, 30190-002, Brazil
| | - Luciana Inácia Gomes
- Clinical Research and Public Politics in Infectious and Parasitic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation (IRR/FIOCRUZ), Av. Augusto de Lima, 1715, Belo Horizonte, MG, 30190-002, Brazil
| | - Liliane Maria Vidal Siqueira
- Biology of the Schistosoma mansoni and its Interaction with Host, Instituto René Rachou, Oswaldo Cruz Foundation (IRR/FIOCRUZ), Av. Augusto de Lima, 1715, Belo Horizonte, MG, 30190-002, Brazil
| | - Paulo Marcos Zech Coelho
- Biology of the Schistosoma mansoni and its Interaction with Host, Instituto René Rachou, Oswaldo Cruz Foundation (IRR/FIOCRUZ), Av. Augusto de Lima, 1715, Belo Horizonte, MG, 30190-002, Brazil
| | - Ana Rabello
- Clinical Research and Public Politics in Infectious and Parasitic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation (IRR/FIOCRUZ), Av. Augusto de Lima, 1715, Belo Horizonte, MG, 30190-002, Brazil
| | - Edward Oliveira
- Clinical Research and Public Politics in Infectious and Parasitic Diseases, Instituto René Rachou, Oswaldo Cruz Foundation (IRR/FIOCRUZ), Av. Augusto de Lima, 1715, Belo Horizonte, MG, 30190-002, Brazil.
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Assis TMD, Guimarães PN, Oliveira E, Peruhype-Magalhães V, Gomes LI, Rabello A. Acceptance and potential barriers to effective use of diagnostic tests for visceral leishmaniasis in an urban area in Brazil. Rev Soc Bras Med Trop 2016; 49:241-4. [PMID: 27192596 DOI: 10.1590/0037-8682-0247-2015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 11/03/2015] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Acceptance of the IT LEISH(r) and direct agglutination test- made in the Laboratório de Pesquisas Clínicas (DAT-LPC) by healthcare professionals and patients suspected of visceral leishmaniasis (VL) in Ribeirão das Neves was evaluated. METHODS Ninety-two patients and 47 professionals completed three questionnaires. RESULTS Eighty-eight (96%) patients considered fingertip blood collection a positive test feature, and 86% (37) and 91% of professionals considered the IT LEISH(r) easy to perform and interpret, respectively. All professionals classified the DAT-LPC as simple and easy. CONCLUSIONS Patients and healthcare professionals in Ribeirão das Neves demonstrated a high degree of acceptance of the IT LEISH(r) and DAT-LPC.
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Affiliation(s)
- Tália Machado de Assis
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Paloma Nogueira Guimarães
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Edward Oliveira
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Vanessa Peruhype-Magalhães
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Luciana Inácia Gomes
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Ana Rabello
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
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Assis TSMD, Guimarães PN, Oliveira E, Peruhype-Magalhães V, Gomes LI, Rabello A. Study of implementation and direct cost estimates for diagnostic tests for human visceral leishmaniasis in an urban area in Brazil. CAD SAUDE PUBLICA 2016; 31:2127-36. [PMID: 26735380 DOI: 10.1590/0102-311x00158614] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Accepted: 05/04/2015] [Indexed: 11/22/2022] Open
Abstract
This work reports the process and costs of comprehensively implementing two tests to decentralize the diagnosis of visceral leishmaniasis (VL) in an endemic city in Brazil: a rapid test (IT LEISH) and a direct agglutination test (DAT-LPC). The implementation began by training health professionals to perform the tests. Estimation of the training costs considered the proportional remuneration of all professionals involved and the direct costs of the tests used for training. The study was conducted between November 2011 and November 2013. During that time, 17 training sessions were held, and 175 professionals were trained. The training cost for each professional was US$ 7.13 for the IT LEISH and US$ 9.93 for the DAT-LPC. The direct costs of the IT LEISH and DAT-LPC were estimated to be US$ 6.62 and US$ 5.44, respectively. This first evaluation of the implementation of these diagnostic tests indicates the feasibility of decentralizing both methods to extend access to VL diagnosis in Brazil.
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Affiliation(s)
| | | | - Edward Oliveira
- Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Brasil
| | | | | | - Ana Rabello
- Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Brasil
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Siqueira LMV, Gomes LI, Oliveira E, Oliveira ERD, Oliveira ÁAD, Enk MJ, Carneiro NF, Rabello A, Coelho PMZ. Evaluation of parasitological and molecular techniques for the diagnosis and assessment of cure of schistosomiasis mansoni in a low transmission area. Mem Inst Oswaldo Cruz 2015; 110:209-14. [PMID: 25946244 PMCID: PMC4489451 DOI: 10.1590/0074-02760140375] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Accepted: 01/26/2015] [Indexed: 11/22/2022] Open
Abstract
This study evaluated parasitological and molecular techniques for the diagnosis and
assessment of cure of schistosomiasis mansoni. A population-based study was performed
in 201 inhabitants from a low transmission locality named Pedra Preta, municipality
of Montes Claros, state of Minas Gerais, Brazil. Four stool samples were analysed
using two techniques, the Kato-Katz® (KK) technique (18 slides) and the
TF-Test®, to establish the infection rate. The positivity rate of 18 KK
slides of four stool samples was 28.9% (58/201) and the combined parasitological
techniques (KK+TF-Test®) produced a 35.8% positivity rate (72/201).
Furthermore, a polymerase chain reaction (PCR)-ELISA assay produced a positivity rate
of 23.4% (47/201) using the first sample. All 72 patients with positive
parasitological exams were treated with a single dose of Praziquantel® and
these patients were followed-up 30, 90 and 180 days after treatment to establish the
cure rate. Cure rates obtained by the analysis of 12 KK slides were 100%, 100% and
98.4% at 30, 90 and 180 days after treatment, respectively. PCR-ELISA revealed cure
rates of 98.5%, 95.5% and 96.5%, respectively. The diagnostic and assessment of cure
for schistosomiasis may require an increased number of KK slides or a test with
higher sensitivity, such as PCR-ELISA, in situations of very low parasite load, such
as after therapeutic interventions.
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Affiliation(s)
| | - Luciana Inácia Gomes
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fiocruz, Belo Horizonte, MG, Brasil
| | - Edward Oliveira
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fiocruz, Belo Horizonte, MG, Brasil
| | | | | | | | | | - Ana Rabello
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fiocruz, Belo Horizonte, MG, Brasil
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da Silva TAM, Gomes LI, Oliveira E, Coura-Vital W, Silva LDA, Pais FSM, Ker HG, Reis AB, Rabello A, Carneiro M. Genetic homogeneity among Leishmania (Leishmania) infantum isolates from dog and human samples in Belo Horizonte Metropolitan Area (BHMA), Minas Gerais, Brazil. Parasit Vectors 2015; 8:226. [PMID: 25889010 PMCID: PMC4407872 DOI: 10.1186/s13071-015-0837-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 03/31/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Certain municipalities in the Belo Horizonte Metropolitan Area (BHMA), Minas Gerais, Brazil, have the highest human visceral leishmaniasis (VL) mortality rates in the country and also demonstrate high canine seropositivity. In Brazil, the etiologic agent of VL is Leishmania (Leishmania) infantum. The aim of this study was to evaluate the intraspecific genetic variability of parasites from humans and from dogs with different clinical forms of VL in five municipalities of BHMA using PCR-RFLP and two target genes: kinetoplast DNA (kDNA) and gp63. METHODS In total, 45 samples of DNA extracted from clinical samples (n = 35) or L. infantum culture (n = 10) were evaluated. These samples originated from three groups: adults (with or without Leishmania/HIV co-infection; n = 14), children (n = 18) and dogs (n = 13). The samples were amplified for the kDNA target using the MC1 and MC2 primers (447 bp), while the Sg1 and Sg2 (1330 bp) primers were used for the gp63 glycoprotein target gene. RESULTS The restriction enzyme patterns of all the samples tested were monomorphic. CONCLUSIONS These findings reveal a high degree of genetic homogeneity for the evaluated gene targets among L. infantum samples isolated from different hosts and representing different clinical forms of VL in the municipalities of BHMA studied.
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Affiliation(s)
- Thais Almeida Marques da Silva
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brasil. .,Laboratório de Epidemiologia das Doenças Infecciosas e Parasitárias, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil.
| | - Luciana Inácia Gomes
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brasil.
| | - Edward Oliveira
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brasil.
| | - Wendel Coura-Vital
- Laboratório de Epidemiologia das Doenças Infecciosas e Parasitárias, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil. .,Pós-graduação em Ciências da Saúde: Infectologia e Medicina Tropical, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil. .,Laboratório de Pesquisas Clínicas, Escola de Farmácia, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brasil.
| | - Letícia de Azevedo Silva
- Laboratório de Toxoplasmose, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil.
| | - Fabiano Sviatopolk-Mirsky Pais
- Grupo de Genômica e Biologia Computacional, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brasil.
| | - Henrique Gama Ker
- Laboratório de Pesquisas Clínicas, Escola de Farmácia, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brasil.
| | - Alexandre Barbosa Reis
- Laboratório de Pesquisas Clínicas, Escola de Farmácia, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brasil.
| | - Ana Rabello
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brasil.
| | - Mariangela Carneiro
- Laboratório de Epidemiologia das Doenças Infecciosas e Parasitárias, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil. .,Pós-graduação em Ciências da Saúde: Infectologia e Medicina Tropical, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil.
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Pascoal-Xavier MA, Figueiredo ACC, Gomes LI, Peruhype-Magalhães V, Calzavara-Silva CE, Costa MA, Reis IA, Bonjardim CA, Kroon EG, de Oliveira JG, Ferreira PCP. RAP1 GTPase overexpression is associated with cervical intraepithelial neoplasia. PLoS One 2015; 10:e0123531. [PMID: 25856570 PMCID: PMC4391937 DOI: 10.1371/journal.pone.0123531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 02/19/2015] [Indexed: 01/06/2023] Open
Abstract
RAP1 (RAS proximate 1), a small GTP-binding protein of the RAS superfamily, is a putative oncogene that is highly expressed in several malignant cell lines and types of cancers, including some types of squamous cell carcinoma. However, the participation of RAP1 in cervical carcinogenesis is unknown. We conducted a cross-sectional study of paraffin-embedded cervical biopsies to determine the association of RAP1 with cervical intraepithelial neoplasia (CIN). Standard and quantitative immunohistochemistry assessment of RAP1 expression in fixed tissue was performed on 183 paraffin-embedded cervical biopsies that were classified as normal or non-dysplastic mucosa (NDM) (n = 33); CIN grade 1 (n = 84) and CIN grade 2/3 (n = 66). A gradual increase in RAP1 expression in NDM < CIN 1 < CIN 2/3 (p<0.001) specimens was observed and was in agreement with the histopathologic diagnosis. A progressive increase in the RAP1 expression levels increased the risk of CIN 1 [odds ratio (OR) = 3.50; 95% confidence interval (CI) 1.30-10.64] 3.5 fold and the risk of CIN 2/3 (OR = 19.86, 95% CI 6.40-70.79) nearly 20 fold when compared to NDM. In addition, stereotype ordinal regression analysis showed that this progressive increase in RAP1 expression more strongly impacted CIN 2/3 than CIN 1. Our findings suggest that RAP1 may be a useful biomarker for the diagnosis of CIN.
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Affiliation(s)
- Marcelo Antonio Pascoal-Xavier
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | | | | | | | | | - Marcelo Azevedo Costa
- Departamento de Engenharia de Produção, Escola de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | - Ilka Afonso Reis
- Departamento de Estatística, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | - Claudio Antônio Bonjardim
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | - Erna Geessien Kroon
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | | | - Paulo César Peregrino Ferreira
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
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Maciel DB, Silva TAM, Gomes LI, de Oliveira E, Tibúrcio MGS, de Oliveira RF, Avelar D, Barbosa JR, Furtado E, Rabello A, Silva LDA. Infection with Leishmania (Leishmania) infantum of 0 to 18-Month-old children living in a visceral leishmaniasis-endemic area in Brazil. Am J Trop Med Hyg 2014; 91:329-35. [PMID: 24935952 DOI: 10.4269/ajtmh.13-0418] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The diagnosis of Leishmania (Leishmania) infantum infection in children from birth may serve as a reference for the early identification of cases that would progress to classical visceral leishmaniasis (VL) in endemic areas. This study prospectively evaluated newborns of mothers living in the municipality of Paracatu, Minas Gerais, Brazil. The infants were followed up at 6-month intervals by clinical examination, serological tests (immunofluorescence [IIF] and enzyme-linked immunosorbent assay with rK39 [ELISA-rK39]) and polymerase chain reaction (PCR) until they had completed 18 months of age. A total of 166 pregnant women were included to evaluate the possible transfer of antibodies or even congenital transmission. Twenty-two of the women tested positive by IIF, four by ELISA-rK39, and one by PCR. Three infants of the 25 women with some positive test results were also positive in the first test (one by IIF, one by ELISA-rK39, and the third by ELISA-rK39 and PCR). One hundred and sixty infants were included in the study; of these, 43 had at least one positive sample over time. However, agreement between tests was low. Follow-up of children with a positive result in the tests studied revealed no progression to classical disease within a period of 18 months. In contrast, two children with negative IIF, PCR, and ELISA-rK39 results developed classical VL at 9 and 12 months of age. In conclusion, a positive test result was variable and sometimes temporary and agreement between tests was low. Therefore, the early diagnosis of Leishmania infection was not associated with the early identification of cases that would progress to classical VL in the endemic area studied.
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Affiliation(s)
- Danielle Borges Maciel
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - Thaís Almeida M Silva
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - Luciana Inácia Gomes
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - Edward de Oliveira
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - Monique Gomes Salles Tibúrcio
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - Rafael Faria de Oliveira
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - Daniel Avelar
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - José Ronaldo Barbosa
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - Eliana Furtado
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - Ana Rabello
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
| | - Luciana de Almeida Silva
- Pós-graduação em Medicina Tropical e Infectologia da Universidade Federal do Triângulo Mineiro, Uberaba, Brasil; Fundação Ezequiel Dias, Belo Horizonte, Brasil; Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou (CPqRR), Fundação Oswaldo Cruz (FIOCRUZ), Belo Horizonte, Brasil
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Mourão MVA, Toledo A, Gomes LI, Freire VV, Rabello A. Parasite load and risk factors for poor outcome among children with visceral leishmaniasis. A cohort study in Belo Horizonte, Brazil, 2010-2011. Mem Inst Oswaldo Cruz 2014; 109:147-53. [PMID: 24676657 PMCID: PMC4015258 DOI: 10.1590/0074-0276140257] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Accepted: 12/05/2013] [Indexed: 01/08/2023] Open
Abstract
Clinical and laboratory risk factors for death from visceral leishmaniasis (VL) are
relatively known, but quantitative real-time polymerase chain reaction (qPCR) might
assess the role of parasite load in determining clinical outcome. The aim of this
study was to identify risk factors, including parasite load in peripheral blood, for
VL poor outcome among children. This prospective cohort study evaluated children aged
≤ 12 years old with VL diagnosis at three times: pre-treatment (T0), during treatment
(T1) and post-treatment (T2). Forty-eight patients were included and 16 (33.3%) met
the criteria for poor outcome. Age ≤ 12 months [relative risk (RR) 3.51; 95%
confidence interval (CI) 1.89-6.52], tachydyspnoea (RR 3.46; 95% CI 2.19-5.47),
bacterial infection (RR 3.08; 95% CI 1.27-7.48), liver enlargement (RR 3.00; 95% CI
1.44-6.23) and low serum albumin (RR 7.00; 95% CI 1.80-27.24) were identified as risk
factors. qPCR was positive in all patients at T0 and the parasite DNA was
undetectable in 76.1% of them at T1 and in 90.7% at T2. There was no statistical
association between parasite load at T0 and poor outcome.
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Affiliation(s)
| | - Antonio Toledo
- Serviço Multiprofissional de Infectologia, Universidade José do Rosário Vellano-UNIFENAS, Belo Horizonte, MG, Brasil
| | - Luciana Inácia Gomes
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou-Fiocruz, Belo Horizonte, MG, Brasil
| | - Verônica Vieira Freire
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou-Fiocruz, Belo Horizonte, MG, Brasil
| | - Ana Rabello
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou-Fiocruz, Belo Horizonte, MG, Brasil
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Clemente WT, Rabello A, Faria LC, Peruhype-Magalhães V, Gomes LI, da Silva TAM, Nunes RVP, Iodith JB, Protil KZ, Fernandes HR, Cortes JRG, Lima SSS, Lima AS, Romanelli RMC. High prevalence of asymptomatic Leishmania spp. infection among liver transplant recipients and donors from an endemic area of Brazil. Am J Transplant 2014; 14:96-101. [PMID: 24369026 DOI: 10.1111/ajt.12521] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Visceral leishmaniasis is an uncommon disease in transplant recipients; however, if left untreated, the mortality can be high. If an organ donor or recipient is known to be an asymptomatic Leishmania spp. carrier,monitoring is advised. This study proposes to assess the prevalence of asymptomatic Leishmania spp.infection in liver transplant donors and recipients from an endemic area. A total of 50 liver recipients and 17 liver donors were evaluated by direct parasite search, indirect fluorescent antibody test (IFAT), anti-Leishmania rK39 rapid test and Leishmania spp.DNA detection by polymerase chain reaction (PCR).Leishmania spp. amastigotes were not observed in liver or spleen tissues. Of the 67 serum samples, IFAT was reactive in 1.5% and indeterminate for 17.9%, and the anti-Leishmania rK39 rapid test was negative for all samples. The PCR test was positive for 7.5%, 8.9%, and 5.9% of blood, liver and spleen samples, respectively(accounting for 23.5% of the donors and 8% of the recipients). Leishmania infantum-specific PCR confirmed all positive samples. In conclusion, a high prevalence of asymptomatic L. infantum was observed in donors and recipients from an endemic area, and PCR was the most sensitive method for screening these individuals.
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de Castro MCM, Rocha-Silva F, Gomes LI, Zauli DAG, de Moraes Mourão M, de Castro MM, Guimarães RES, Teixeira-Carvalho A, Martins-Filho OA. Impact of mitomycin C on the mRNA expression signatures of immunological biomarkers in eosinophilic nasal polyposis. Am J Rhinol Allergy 2013; 27:32-41. [PMID: 23406597 DOI: 10.2500/ajra.2013.27.3868] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND The topical application of mitomycin C has been evaluated as a complementary therapy for eosinophilic nasal polyposis (ENP). However, the mechanism underlying the additional benefits of mitomycin C for the control of eosinophilic inflammation and prevention of posttherapeutic relapse remains to be elucidated. In this work, the aim was to characterize the gene expression profile by quantitative real-time polymerase chain reaction (qPCR) of proinflammatory and regulatory biomarkers that are typically associated with ENP and to assess the impact of the topical application of mitomycin C on the nasal mucosal tissue immunologic milieu after ENP surgery. METHODS We have selected 20 patients with ENP that were recommended to undergo surgical intervention. Normal mucosal tissue was obtained from healthy nasal mucosa from six patients with absence of eosinophilic infiltration. To test the effect of mitomycin C, one side of the maxillary sinus mucosa was selected for topical application of this drug and the other received no further treatment and acted as the control. The genes interleukin-4 (IL-4), IL-5, IL-10, IL-13, chemokine (C-C motif) ligand 5 (CCL5), CCL24, colony-stimulating factor 2 (CSF2), transforming growth factor beta 1 (TGFB1), tumor necrosis factor alpha (TNF-alpha), and beta actin (ACTB) were selected for gene expression analysis by qPCR. RESULTS The data showed higher expression of proinflammatory biomarkers and lower levels of regulatory TGFB1 transcripts in ENP mucosal tissue. Surgery with topical application of mitomycin C induced a prominent transcriptional down-regulation of the immunologic biomarkers, CCL24, TNF-alpha, CSF2, and IL-5, in ENP mucosal tissue. Additionally, this treatment restored the levels of chemokines and cytokines to those observed in the nasal mucosal tissue of control subjects, except for TGFB1, which remained below the reference pattern. Moreover, CSF2 was identified as a putative biomarker with significant predictive value for complementary prophylactic purposes after surgery in ENP patients. CONCLUSION After the characterization of the expression signatures of immunologic biomarkers in ENP, we observed that the topical use of mitomycin C is important for the reestablishment of the immunologic microenvironment of a normal expression profile of biomarkers involved in ENP mucosal tissue.
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Affiliation(s)
- Mirian Cabral Moreira de Castro
- Departamento de Oftalmologia, Otorrinolaringologia e Fonoaudiologia da Universidade Federal de Minas Gerais, Faculdade de Medicina, Universidade Federal de Minas Gerais, Av. Alfredo Balena, Belo Horizonte, Minas Gerais, Brazil
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Cota GF, de Sousa MR, de Freitas Nogueira BM, Gomes LI, Oliveira E, Assis TSM, de Mendonça ALP, Pinto BF, Saliba JW, Rabello A. Comparison of parasitological, serological, and molecular tests for visceral leishmaniasis in HIV-infected patients: a cross-sectional delayed-type study. Am J Trop Med Hyg 2013; 89:570-7. [PMID: 23836568 DOI: 10.4269/ajtmh.13-0239] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The aim of this study was to evaluate the accuracy of invasive and non-invasive tests for diagnosis of visceral leishmaniasis (VL) in a large series of human immunodeficiency virus (HIV)-infected patients. In this delayed-type cross-sectional study, 113 HIV-infected symptomatic patients were evaluated by an adjudication committee after clinical follow-up to establish the presence or absence of VL as the target condition (reference test). The index tests were recombinant K39 antigen-based immunochromatographic test (rK39), indirect fluorescent antibody test (IFAT), prototype kit of direct agglutination test (DAT-LPC), and real-time polymerase chain reaction (qPCR) in peripheral blood. Compared with parasitological test and adjudication committee diagnosis or latent class model analyses, IFAT and rk39 dipstick test presented the lowest sensitivity. DAT-LPC exhibited good overall performance, and there was no statistical difference between DAT-LPC and qPCR diagnosis accuracy. Real-time PCR emerges as a less invasive alternative to parasitological examination for confirmation of cases not identified by DAT.
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Affiliation(s)
- Gláucia Fernandes Cota
- Eduardo de Menezes Hospital, Fundação Hospitalar do Estado de Minas Gerais (FHEMIG), Belo Horizonte, Minas Gerais, Brazil.
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dos Santos Marques LH, Gomes LI, da Rocha ICM, da Silva TAM, Oliveira E, Morais MHF, Rabello A, Carneiro M. Low parasite load estimated by qPCR in a cohort of children living in urban area endemic for visceral leishmaniasis in Brazil. PLoS Negl Trop Dis 2012; 6:e1955. [PMID: 23272263 PMCID: PMC3521664 DOI: 10.1371/journal.pntd.0001955] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 10/28/2012] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND An important issue associated with the control of visceral leishmaniasis is the need to identify and understand the relevance of asymptomatic infection caused by Leishmania infantum. The aim of this study was to follow the course of asymptomatic L. infantum infection in children in an area of Brazil where it is endemic. The children were assessed twice during a 12-month period. METHODOLOGY In this population study, 1875 children, ranging from 6 months to 7 years of age, were assessed. Blood samples were collected on filter papers via finger prick and tested by ELISA (L. infantum soluble antigen and rk39). Seropositives samples (n = 317) and a number of seronegatives samples (n = 242) were subjected to qPCR. After 12 months, blood samples were collected from a subgroup of 199 children and tested for Leishmania spp. to follow the course of infection. PRINCIPAL FINDINGS At baseline qPCR testing identified 82 positive samples. The prevalence rate, as estimated for 1875 children based on the qPCR results, was 13.9%. The qPCR testing of whole blood samples collected from a cohort of children after 12 months (n = 199) yielded the following results: of the 44 (22.1%) children with positive qPCR results at baseline, only 10 (5.0%) remained positive, and 34 (17.1%) became negative; and of the 155 (77.9%) children with negative qPCR results, 131 (65.8%) remained negative, and 24 (12.1%) became positive at the follow-up measurement. The samples with positive findings at baseline (n = 82) had a mean of 56.5 parasites/mL of blood; and at follow-up the mean positive result was 7.8 parasites/mL. CONCLUSIONS The peripheral blood of asymptomatic children had a low and fluctuating quantity of Leishmania DNA and a significant decrease in parasitemia at 1-year follow-up. Quantitative PCR enables adequate monitoring of Leishmania infection.
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Affiliation(s)
- Letícia Helena dos Santos Marques
- Laboratório de Epidemiologia de Doenças Infecciosas e Parasitárias, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Luciana Inácia Gomes
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Brazil
| | - Iara Caixeta Marques da Rocha
- Laboratório de Epidemiologia de Doenças Infecciosas e Parasitárias, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
- Secretaria Municipal de Saúde, Prefeitura de Belo Horizonte, Belo Horizonte, Brazil
| | - Thaís Almeida Marques da Silva
- Laboratório de Epidemiologia de Doenças Infecciosas e Parasitárias, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Edward Oliveira
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Brazil
| | - Maria Helena Franco Morais
- Laboratório de Epidemiologia de Doenças Infecciosas e Parasitárias, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
- Secretaria Municipal de Saúde, Prefeitura de Belo Horizonte, Belo Horizonte, Brazil
| | - Ana Rabello
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Brazil
| | - Mariângela Carneiro
- Laboratório de Epidemiologia de Doenças Infecciosas e Parasitárias, Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
- Pós-graduação em Ciências da Saúde: Infectologia e Medicina Tropical, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
- * E-mail:
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Carvalho GCD, Marques LHDS, Gomes LI, Rabello A, Ribeiro LC, Scopel KKG, Tibiriçá SHC, Coimbra ES, Abramo C. Polymerase chain reaction for the evaluation of Schistosoma mansoni infection in two low endemicity areas of Minas Gerais, Brazil. Mem Inst Oswaldo Cruz 2012; 107:899-902. [DOI: 10.1590/s0074-02762012000700010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Accepted: 08/08/2012] [Indexed: 11/22/2022] Open
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Gomes LI, Marques LHDS, Enk MJ, de Oliveira MC, Coelho PMZ, Rabello A. Development and evaluation of a sensitive PCR-ELISA system for detection of schistosoma infection in feces. PLoS Negl Trop Dis 2010; 4:e664. [PMID: 20421918 PMCID: PMC2857640 DOI: 10.1371/journal.pntd.0000664] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Accepted: 03/09/2010] [Indexed: 11/18/2022] Open
Abstract
Background A PCR-enzyme-linked immunosorbent assay (PCR-ELISA) was developed to overcome the need for sensitive techniques for the efficient diagnosis of Schistosoma infection in endemic settings with low parasitic burden. Methodology/Principal Findings This system amplifies a 121-base pair tandem repeat DNA sequence, immobilizes the resultant 5′ biotinylated product on streptavidin-coated strip-well microplates and uses anti-fluorescein antibodies conjugated to horseradish peroxidase to detect the hybridized fluorescein-labeled oligonucleotide probe. The detection limit of the Schistosoma PCR-ELISA system was determined to be 1.3 fg of S. mansoni genomic DNA (less than the amount found in a single cell) and estimated to be 0.15 S. mansoni eggs per gram of feces (fractions of an egg). The system showed good precision and genus specificity since the DNA target was found in seven Schistosoma DNA samples: S. mansoni, S. haematobium, S. bovis, S. intercalatum, S. japonicum, S. magrebowiei and S. rhodaini. By evaluating 206 patients living in an endemic area in Brazil, the prevalence of S. mansoni infection was determined to be 18% by examining 12 Kato-Katz slides (41.7 mg/smear, 500 mg total) of a single fecal sample from each person, while the Schistosoma PCR-ELISA identified a 30% rate of infection using 500-mg of the same fecal sample. When considering the Kato-Katz method as the reference test, artificial sensitivity and specificity rates of the PCR-ELISA system were 97.4% and 85.1%, respectively. The potential for estimating parasitic load by DNA detection in feces was assessed by comparing absorbance values and eggs per gram of feces, with a Spearman correlation coefficient of 0.700 (P<0.0001). Conclusions/Significance This study reports the development and field evaluation of a sensitive Schistosoma PCR-ELISA, a system that may serve as an alternative for diagnosing Schistosoma infection. Schistosomiasis is a neglected disease caused by worms of the genus Schistosoma. The transmission cycle requires contamination of bodies of water by parasite eggs present in excreta, specific snails as intermediate hosts and human contact with water. Fortunately, relatively safe and easily administrable drugs are available and, as the outcome of repeated treatment, a reduction of severe clinical forms and a decrease in the number of infected persons has been reported in endemic areas. The routine method for diagnosis is the microscopic examination but it fails when there are few eggs in the feces, as usually occurs in treated but noncured persons or in areas with low levels of transmission. This study reports the development of the PCR-ELISA system for the detection of Schistosoma DNA in human feces as an alternative approach to diagnose light infections. The system permits the enzymatic amplification of a specific region of the DNA from minute amounts of parasite material. Using the proposed PCR-ELISA approach for the diagnosis of a population in an endemic area in Brazil, 30% were found to be infected, as compared with the 18% found by microscopic fecal examination. Although the technique requires a complex laboratory infrastructure and specific funding it may be used by control programs targeting the elimination of schistosomiasis.
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Affiliation(s)
- Luciana Inácia Gomes
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz (Fiocruz), Belo Horizonte, Minas Gerais, Brazil
| | - Letícia Helena dos Santos Marques
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz (Fiocruz), Belo Horizonte, Minas Gerais, Brazil
| | - Martin Johannes Enk
- Laboratório de Esquistossomose, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz (Fiocruz), Belo Horizonte, Minas Gerais, Brazil
| | - Maria Cláudia de Oliveira
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz (Fiocruz), Belo Horizonte, Minas Gerais, Brazil
| | - Paulo Marcos Zech Coelho
- Laboratório de Esquistossomose, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz (Fiocruz), Belo Horizonte, Minas Gerais, Brazil
| | - Ana Rabello
- Laboratório de Pesquisas Clínicas, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz (Fiocruz), Belo Horizonte, Minas Gerais, Brazil
- * E-mail:
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Gomes LI, Rocha MA, Souza JG, Costa EA, Barbosa-Stancioli EF. Bovine herpesvirus 5 (BoHV-5) in bull semen: amplification and sequence analysis of the US4 gene. Vet Res Commun 2003; 27:495-504. [PMID: 14582748 DOI: 10.1023/a:1025745825610] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Bovine herpesvirus type 5 (BoHV-5), which is potentially neuropathogenic, was detected in clinical samples of bovine semen, both directly and after isolation in cell culture, using a nested PCR system for amplifying the US4 gene. Nucleotide sequences generated from the amplicons were analysed and deposited at GenBank (NCBI, Bethesda, MD, USA) under the accession numbers AF298174 and AF330157. Alignment of these sequences and previously deposited sequences of BoHV-1 and BoHV-5 showed 82% and 98% similarity, respectively. The bulls, which were maintained at an artificial insemination centre, had presented no clinical signs, indicating that bovine semen should be screened for BoHV-5 to prevent transmission of the virus.
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Affiliation(s)
- L I Gomes
- Laboratório de Biologia de Microorganisms Intracelulares, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, caixa postal 486, CEP 31270-901, Belo Horizonte, MG, Brazil
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