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  1. Article ; Online: Combined use of two rapid tests for the conclusive diagnosis of Chagas disease: a systematic scoping review.

    Ortega-Arroyo, Arturo / Flores-Chavez, María Delmans / Puente-Alcaraz, Jesús

    BMJ open

    2021  Volume 11, Issue 10, Page(s) e047825

    Abstract: Objective: The goal of this systematic scoping review is to collect and summarise scientific evidence regarding the validity of two simultaneous immunochromatographic tests for the conclusive diagnosis of Chagas disease. The research was informed by the ...

    Abstract Objective: The goal of this systematic scoping review is to collect and summarise scientific evidence regarding the validity of two simultaneous immunochromatographic tests for the conclusive diagnosis of Chagas disease. The research was informed by the following review questions: Will the use of two rapid tests be a valid method for the definitive diagnosis of Chagas disease when compared with conventional serological tests? In what type of population has the operation of two rapid tests been tried for the diagnosis of Chagas disease? What are the biomedical and public health advantages of the diagnostic method resulting from the combination of two rapid tests over the conventional serological method? Will it be a cost-benefit strategy for the diagnosis of Chagas with respect to conventional serological tests?
    Design: Systematic scoping review.
    Setting: A search of the published and unpublished literature in five databases was carried out, in order to identify, screen and select the studies included in this review.
    Results: 468 studies were identified, of which 46 were screened with a full-text reading, and finally, three articles were included in the review. All studies were in endemic countries with adult and paediatric populations (n=1133) and, together, they evaluated four different rapid tests. The rapid tests showed good sensitivity (97.4%-100%) and specificity (96.1%-100%) for the diagnosis of Chagas when used in combination and compared with the reference tests.
    Conclusions: The simultaneous use of at least two immunochromatographic rapid tests is a valid option for the definitive diagnosis of chronic Chagas in endemic rural areas, as long as there are studies that previously evaluate their performance on the areas of implementation. Therefore, this could be an alternative to the current diagnostic standard. However, additional studies are still needed in more countries in order to provide further evidence and to investigate the cost-benefit.
    MeSH term(s) Adult ; Chagas Disease/diagnosis ; Child ; Diagnostic Tests, Routine ; Humans ; Motivation ; Prothrombin Time ; Serologic Tests
    Language English
    Publishing date 2021-10-29
    Publishing country England
    Document type Journal Article ; Systematic Review
    ZDB-ID 2599832-8
    ISSN 2044-6055 ; 2044-6055
    ISSN (online) 2044-6055
    ISSN 2044-6055
    DOI 10.1136/bmjopen-2020-047825
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Evaluation of the Chagas VirClia

    García-Bermejo, Isabel / Arana, David Molina / Zaragoza Vargas, Gloria / Carrasco Fernández, Blanca / García, Emilia / Nieto, Javier / Flores-Chávez, Maria Delmans

    Pathogens (Basel, Switzerland)

    2022  Volume 12, Issue 1

    Abstract: Chagas disease (CD), caused by the ... ...

    Abstract Chagas disease (CD), caused by the protozoan
    Language English
    Publishing date 2022-12-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2695572-6
    ISSN 2076-0817
    ISSN 2076-0817
    DOI 10.3390/pathogens12010050
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Community-based actions in consulates: a new paradigm for opportunities for systematic integration in Chagas disease detection.

    Gómez I Prat, Jordi / Gregori, Maria Serrano / Guiu, Isabel Claveria / Choque, Estefa / Flores-Chavez, Maria Delmans / Molina, Israel / Zarzuela, Francesc / Sulleiro, Elena / Dehousse, Aurore / Albajar-Vinas, Pedro / Ouaarab, Hakima

    BMC infectious diseases

    2023  Volume 23, Issue 1, Page(s) 847

    Abstract: Research has shown that multidimensional approaches to Chagas disease (CD), integrating its biomedical and psycho-socio-cultural components, are successful in enhancing early access to diagnosis, treatment and sustainable follow-up.For the first time, a ... ...

    Abstract Research has shown that multidimensional approaches to Chagas disease (CD), integrating its biomedical and psycho-socio-cultural components, are successful in enhancing early access to diagnosis, treatment and sustainable follow-up.For the first time, a consulate was selected for a community-based CD detection campaign. Two different strategies were designed, implemented and compared between 2021 and 2022 at the Consulate General of Bolivia and a reference health facility in Barcelona open to all Bolivians in Catalonia.Strategy 1 consisted in CD awareness-raising activities before referring those interested to the reference facility for infectious disease screening. Strategy 2 offered additional in-situ serological CD screening. Most of the 307 participants were Bolivian women residents in Barcelona. In strategy 1, 73 people (35.8% of those who were offered the test) were screened and 19.2% of them were diagnosed with CD. Additionally, 53,4% completed their vaccination schedules and 28.8% were treated for other parasitic infections (strongyloidiasis, giardiasis, eosinophilia, syphilis). In strategy 2, 103 people were screened in-situ (100% of those who were offered the test) and 13.5% received a CD diagnosis. 21,4% completed their vaccination schedule at the reference health facility and 2,9% were referred for iron deficiency anemia, strongyloidiasis or chronic hepatitis C.The fact that the screening took place in an official workplace of representatives of their own country, together with the presence of community-based participants fueled trust and increased CD understanding. Each of the strategies assessed had different benefits. Opportunities for systematic integration for CD based on community action in consulates may enhance early access to diagnosis, care and disease prevention.
    MeSH term(s) Humans ; Female ; Strongyloidiasis ; Chagas Disease/diagnosis ; Chagas Disease/epidemiology ; Mass Screening ; Eosinophilia ; Community Participation
    Language English
    Publishing date 2023-12-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 2041550-3
    ISSN 1471-2334 ; 1471-2334
    ISSN (online) 1471-2334
    ISSN 1471-2334
    DOI 10.1186/s12879-023-08844-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Evaluation of five diagnostic methods for Strongyloides stercoralis infection in Amhara National Regional State, northwest Ethiopia.

    Hailu, Tadesse / Amor, Arancha / Nibret, Endalkachew / Munshea, Abaineh / Anegagrie, Melaku / Flores-Chavez, Maria Delmans / Tang, Thuy-Huong Ta / Saugar, Jose M / Benito, Agustín

    BMC infectious diseases

    2022  Volume 22, Issue 1, Page(s) 297

    Abstract: Background: Strongyloides stercoralis is an intestinal parasite that can cause chronic infection, hyperinfection and/or a dissemination syndrome in humans. The use of techniques targeting ova fails to detect S. stercoralis, as only larvae of the ... ...

    Abstract Background: Strongyloides stercoralis is an intestinal parasite that can cause chronic infection, hyperinfection and/or a dissemination syndrome in humans. The use of techniques targeting ova fails to detect S. stercoralis, as only larvae of the parasite are excreted in faeces. Due to the absence of "Gold" standard diagnostic method for S. stercoralis, there is a paucity of reported data worldwide.
    Objective: This study aimed to evaluate the performance of diagnostic methods of S. stercoralis infection by taking the composite reference as a "Gold" standard.
    Methods: A cross-sectional study was conducted among 844 schoolchildren in Amhara Region, Ethiopia, from April to December 2019. Stool samples were collected and processed with formol-ether concentration technique (FECT), spontaneous tube sedimentation technique (STST), Baermann concentration technique (BCT), agar plate culture (APC) and real-time polymerase chain reaction (RT-PCR). Sensitivity, specificity, positive predictive value, and negative predictive value of each diagnostic method were computed against the composite reference. The agreements of diagnostic methods were evaluated by Kappa value at 95% CI.
    Results: The composite detection rate of S. stercoralis by the five diagnostic methods was 39.0% (329/844). The detection rate of the parasite from stool samples by FECT, STST, BCT, APC and RT-PCR was 2.0% (17/844), 4.0% (34/844), 10.2% (86/844), 10.9% (92/844) and 28.8% (243/844), respectively. The highest detection rate (37.8%; 319/844) of S. stercoralis was recorded by a combination of BCT, APC, and RT-PCR followed by a combination of STST, BCT, APC and RT-PCR (37.3%; 315/844). The sensitivity of FECT, STST, BCT, APC and RT-PCR against the composite reference was 5.2%, 10.3%, 26.4%, 28.0% and 73.9%, respectively. The diagnostic agreements of RT-PCR, APC, BCT, STST and FECT with the composite reference in detection of S. stercoralis were substantial (0.775), fair (0.321), fair (0.305), slight (0.123), and slight (0.062), respectively.
    Conclusion: RT-PCR detected the highest number of S. stercoralis infections. A combination of RT-PCR with APC and/or BCT better detected S. stercoralis from stool samples compared to other combinations or single diagnostic methods. Therefore, RT-PCR and combination of RT-PCR with APC and/or BCT diagnostic methods should be advocated for detection of S. stercoralis infection.
    MeSH term(s) Animals ; Child ; Cross-Sectional Studies ; Ethiopia/epidemiology ; Formaldehyde ; Humans ; Strongyloides stercoralis ; Strongyloidiasis/diagnosis ; Strongyloidiasis/parasitology
    Chemical Substances Formaldehyde (1HG84L3525)
    Language English
    Publishing date 2022-03-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 2041550-3
    ISSN 1471-2334 ; 1471-2334
    ISSN (online) 1471-2334
    ISSN 1471-2334
    DOI 10.1186/s12879-022-07299-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Evaluation of the Elecsys Chagas Assay for Detection of Trypanosoma cruzi-Specific Antibodies in a Multicenter Study in Europe and Latin America.

    Flores-Chavez, Maria Delmans / Sambri, Vittorio / Schottstedt, Volkmar / Higuera-Escalante, Fernando Aparicio / Roessler, Dieter / Chaves, Monica / Laengin, Tina / Martinez, Alfredo / Fleischer, Bernhard

    Journal of clinical microbiology

    2018  Volume 56, Issue 5

    Abstract: Serology is the preferred method to confirm a Chagas disease diagnosis and to screen blood donors. A battery of assays is often required due to the limited accuracy of single assays. The Elecsys Chagas assay is a newly developed, double-antigen sandwich ... ...

    Abstract Serology is the preferred method to confirm a Chagas disease diagnosis and to screen blood donors. A battery of assays is often required due to the limited accuracy of single assays. The Elecsys Chagas assay is a newly developed, double-antigen sandwich assay for use on the Elecsys and cobas e immunoassay analyzers, intended to identify individuals infected with
    MeSH term(s) Antibodies, Protozoan/blood ; Chagas Disease/diagnosis ; Europe ; Female ; Humans ; Immunoassay/methods ; Latin America ; Male ; Pregnancy ; Sensitivity and Specificity ; Serologic Tests/methods ; Trypanosoma cruzi/immunology
    Chemical Substances Antibodies, Protozoan
    Language English
    Publishing date 2018-04-25
    Publishing country United States
    Document type Comparative Study ; Evaluation Studies ; Journal Article ; Multicenter Study ; Research Support, Non-U.S. Gov't
    ZDB-ID 390499-4
    ISSN 1098-660X ; 0095-1137
    ISSN (online) 1098-660X
    ISSN 0095-1137
    DOI 10.1128/JCM.01446-17
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Recomendaciones para el diagnóstico, seguimiento y tratamiento de la embarazada y del niño con enfermedad de Chagas.

    González-Tomé, María Isabel / Rivera Cuello, Mercedes / Camaño Gutierrez, Isabel / Norman, Francesca / Flores-Chávez, María Delmans / Rodríguez-Gómez, Leire / Fumadó, Victoria / García-López Hortelano, Milagros / López-Vélez, Rogelio / González-Granado, Luis Ignacio / García-Burguillo, Antonio / Santos Sebastian, María Del Mar / Avila Arzanegui, Olatz

    Enfermedades infecciosas y microbiologia clinica

    2013  Volume 31, Issue 8, Page(s) 535–542

    Abstract: Congenital transmission of Chagas disease now occurs in areas where the disease is non-endemic, and also from one generation to another. According to epidemiological data from Latin America, the prevalence of the disease in pregnant women is 0.7%-54%, ... ...

    Title translation Recommendations for the diagnosis, treatment and follow-up of the pregnant woman and child with Chagas disease. Sociedad Española de Infectología Pediátrica. Sociedad de Enfermedades Infecciosas y Microbiología Clínica. Sociedad Española de Ginecología y Obstetricia.
    Abstract Congenital transmission of Chagas disease now occurs in areas where the disease is non-endemic, and also from one generation to another. According to epidemiological data from Latin America, the prevalence of the disease in pregnant women is 0.7%-54%, and the prevalence of vertical transmission is around 5%-6%. Congenital T. cruzi infection is an acute infection in newborns that should be treated with anti-parasitic therapy. The treatment of pregnant women could also have an impact on the control of the disease. This article has been prepared following the recommendations suggested by a group of experts in Infectious Diseases, Microbiology, Gynaecology and Paediatrics.
    MeSH term(s) Adult ; Breast Feeding ; Chagas Disease/congenital ; Chagas Disease/diagnosis ; Chagas Disease/drug therapy ; Chagas Disease/epidemiology ; Chagas Disease/prevention & control ; Chagas Disease/transmission ; Contraindications ; Early Diagnosis ; Emigrants and Immigrants ; Endemic Diseases ; Enzyme-Linked Immunosorbent Assay ; Female ; Humans ; Infant ; Infant, Newborn ; Infectious Disease Transmission, Vertical/prevention & control ; Latin America/epidemiology ; Mass Screening ; Milk, Human/chemistry ; Milk, Human/parasitology ; Parasitemia/transmission ; Pregnancy ; Pregnancy Complications, Infectious/diagnosis ; Pregnancy Complications, Infectious/drug therapy ; Pregnancy Complications, Infectious/epidemiology ; Pregnancy Complications, Infectious/parasitology ; Risk Factors ; Spain/epidemiology ; Symptom Assessment ; Trypanocidal Agents/adverse effects ; Trypanocidal Agents/therapeutic use
    Chemical Substances Trypanocidal Agents
    Language Spanish
    Publishing date 2013-10
    Publishing country Spain
    Document type Journal Article ; Practice Guideline
    ZDB-ID 1070941-1
    ISSN 1578-1852 ; 0213-005X
    ISSN (online) 1578-1852
    ISSN 0213-005X
    DOI 10.1016/j.eimc.2012.09.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Analytical Validation of Quantitative Real-Time PCR Methods for Quantification of Trypanosoma cruzi DNA in Blood Samples from Chagas Disease Patients.

    Ramírez, Juan Carlos / Cura, Carolina Inés / da Cruz Moreira, Otacilio / Lages-Silva, Eliane / Juiz, Natalia / Velázquez, Elsa / Ramírez, Juan David / Alberti, Anahí / Pavia, Paula / Flores-Chávez, María Delmans / Muñoz-Calderón, Arturo / Pérez-Morales, Deyanira / Santalla, José / Marcos da Matta Guedes, Paulo / Peneau, Julie / Marcet, Paula / Padilla, Carlos / Cruz-Robles, David / Valencia, Edward /
    Crisante, Gladys Elena / Greif, Gonzalo / Zulantay, Inés / Costales, Jaime Alfredo / Alvarez-Martínez, Miriam / Martínez, Norma Edith / Villarroel, Rodrigo / Villarroel, Sandro / Sánchez, Zunilda / Bisio, Margarita / Parrado, Rudy / Maria da Cunha Galvão, Lúcia / Jácome da Câmara, Antonia Cláudia / Espinoza, Bertha / Alarcón de Noya, Belkisyole / Puerta, Concepción / Riarte, Adelina / Diosque, Patricio / Sosa-Estani, Sergio / Guhl, Felipe / Ribeiro, Isabela / Aznar, Christine / Britto, Constança / Yadón, Zaida Estela / Schijman, Alejandro G

    The Journal of molecular diagnostics : JMD

    2015  Volume 17, Issue 5, Page(s) 605–615

    Abstract: An international study was performed by 26 experienced PCR laboratories from 14 countries to assess the performance of duplex quantitative real-time PCR (qPCR) strategies on the basis of TaqMan probes for detection and quantification of parasitic loads ... ...

    Abstract An international study was performed by 26 experienced PCR laboratories from 14 countries to assess the performance of duplex quantitative real-time PCR (qPCR) strategies on the basis of TaqMan probes for detection and quantification of parasitic loads in peripheral blood samples from Chagas disease patients. Two methods were studied: Satellite DNA (SatDNA) qPCR and kinetoplastid DNA (kDNA) qPCR. Both methods included an internal amplification control. Reportable range, analytical sensitivity, limits of detection and quantification, and precision were estimated according to international guidelines. In addition, inclusivity and exclusivity were estimated with DNA from stocks representing the different Trypanosoma cruzi discrete typing units and Trypanosoma rangeli and Leishmania spp. Both methods were challenged against 156 blood samples provided by the participant laboratories, including samples from acute and chronic patients with varied clinical findings, infected by oral route or vectorial transmission. kDNA qPCR showed better analytical sensitivity than SatDNA qPCR with limits of detection of 0.23 and 0.70 parasite equivalents/mL, respectively. Analyses of clinical samples revealed a high concordance in terms of sensitivity and parasitic loads determined by both SatDNA and kDNA qPCRs. This effort is a major step toward international validation of qPCR methods for the quantification of T. cruzi DNA in human blood samples, aiming to provide an accurate surrogate biomarker for diagnosis and treatment monitoring for patients with Chagas disease.
    MeSH term(s) Chagas Disease/blood ; Chagas Disease/diagnosis ; Chagas Disease/genetics ; Chagas Disease/parasitology ; DNA, Protozoan/analysis ; DNA, Protozoan/isolation & purification ; Humans ; International Cooperation ; Laboratory Proficiency Testing ; Molecular Typing ; Parasitemia/blood ; Parasitemia/diagnosis ; Parasitemia/genetics ; Real-Time Polymerase Chain Reaction/methods ; Sensitivity and Specificity ; Trypanosoma cruzi/genetics ; Trypanosoma cruzi/isolation & purification
    Chemical Substances DNA, Protozoan
    Language English
    Publishing date 2015-07-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Validation Study
    ZDB-ID 2000060-1
    ISSN 1943-7811 ; 1525-1578
    ISSN (online) 1943-7811
    ISSN 1525-1578
    DOI 10.1016/j.jmoldx.2015.04.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Book ; Online: Analytical Validation of Quantitative Real-Time PCR Methods for Quantification of Trypanosoma cruzi DNA in Blood Samples from Chagas Disease Patients

    Yadón, Zaida Estela / Britto, Constança / Greif, Gonzalo / Bisio, Margarita / Muñoz-Calderón, Arturo / Alvarez-Martínez, Miriam / Cruz-Robles, David / Costales, Jaime Alfredo / Diosque, Patricio / Maria da Cunha Galvão, Lúcia / Ramírez, Juan David / Guhl, Felipe / Padilla, Carlos / Valencia, Edward / Espinoza, Bertha / Sosa-Estani, Sergio / Puerta, Concepción / Crisante, Gladys Elena / Alarcón de Noya, Belkisyole /
    Martínez, Norma Edith / Zulantay, Inés / Riarte, Adelina / Flores-Chávez, María Delmans / Villarroel, Rodrigo / Marcos da Matta Guedes, Paulo / Sánchez, Zunilda / Peneau, Julie / Schijman, Alejandro G / Lages-Silva, Eliane / Pavia, Paula / Aznar, Christine / Juiz, Natalia / Santalla, José / Parrado, Rudy / Ribeiro, Isabela / Ramírez, Juan Carlos / Pérez-Morales, Deyanira / Alberti, Anahí / Marcet, Paula / da Cruz Moreira, Otacilio / Cura, Carolina Inés / Jácome da Câmara, Antonia Cláudia / Villarroel, Sandro / Velázquez, Elsa

    2015  

    Abstract: Research Support, Non-U.S. Gov't ... Validation Studies ... Journal Article ...

    Abstract Research Support, Non-U.S. Gov't

    Validation Studies

    Journal Article

    An international study was performed by 26 experienced PCR laboratories from 14 countries to assess the performance of duplex quantitative real-time PCR (qPCR) strategies on the basis of TaqMan probes for detection and quantification of parasitic loads in peripheral blood samples from Chagas disease patients. Two methods were studied: Satellite DNA (SatDNA) qPCR and kinetoplastid DNA (kDNA) qPCR. Both methods included an internal amplification control. Reportable range, analytical sensitivity, limits of detection and quantification, and precision were estimated according to international guidelines. In addition, inclusivity and exclusivity were estimated with DNA from stocks representing the different Trypanosoma cruzi discrete typing units and Trypanosoma rangeli and Leishmania spp. Both methods were challenged against 156 blood samples provided by the participant laboratories, including samples from acute and chronic patients with varied clinical findings, infected by oral route or vectorial transmission. kDNA qPCR showed better analytical sensitivity than SatDNA qPCR with limits of detection of 0.23 and 0.70 parasite equivalents/mL, respectively. Analyses of clinical samples revealed a high concordance in terms of sensitivity and parasitic loads determined by both SatDNA and kDNA qPCRs. This effort is a major step toward international validation of qPCR methods for the quantification of T. cruzi DNA in human blood samples, aiming to provide an accurate surrogate biomarker for diagnosis and treatment monitoring for patients with Chagas disease.
    Language English
    Publishing date 2015-09-01
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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