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de Oliveira LC, Pereira NB, Moreira CHV, Bierrenbach AL, Salles FC, de Souza-Basqueira M, Manuli ER, Ferreira AM, Oliveira CDL, Cardoso CS, Ribeiro ALP, Sabino EC. ELISA Saliva for Trypanosoma cruzi Antibody Detection: An Alternative for Serological Surveys in Endemic Regions. Am J Trop Med Hyg 2020; 102:800-803. [PMID: 32100675 PMCID: PMC7124906 DOI: 10.4269/ajtmh.18-0330] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 01/17/2020] [Indexed: 11/07/2022] Open
Abstract
Chagas is a neglected disease endemic in Latin America. Vector transmission control had been aggressively performed. Recent entomological surveillance in Brazil has revealed natural infection rates ranging from 0.40% to 0.52%. Although serological surveys are complex to develop, they are important for disease control. In this study, we validated the use of saliva in ELISA commercial kits with a cohort of 100 patients with Chagas disease followed at Hospital das Clinicas in São Paulo, Brazil, and 50 healthy controls. Five ELISA kits for detecting antibodies against Trypanosoma cruzi were tested. The best discrimination between Chagas patients and controls was observed with the Wiener kit, which yielded a sensitivity of 97% and a specificity of 100%. Our findings reveal that the use of saliva may be an alternative to large-scale screening surveys in detecting T. cruzi antibodies; it is a noninvasive sample collection method potentially key to large-scale screening in children.
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Affiliation(s)
- Léa Campos de Oliveira
- LIM03, Hospital das Clínicas, Medical School, University of São Paulo, São Paulo, Brazil
| | | | | | | | | | | | | | | | | | | | - Antonio Luiz P. Ribeiro
- Hospital das Clínicas and School of Medicine, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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Ribeiro RM, Souza-Basqueira MD, Oliveira LCD, Salles FC, Pereira NB, Sabino EC. An alternative storage method for characterization of the intestinal microbiota through next generation sequencing. Rev Inst Med Trop Sao Paulo 2018; 60:e77. [PMID: 30517247 PMCID: PMC6282504 DOI: 10.1590/s1678-9946201860077] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [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: 05/17/2018] [Accepted: 11/07/2018] [Indexed: 12/20/2022] Open
Abstract
Gut microbiota has been the subject of various molecular studies mainly due to its importance and wide-ranging relationships with human hosts. However, the storage of fecal samples prior to DNA extraction is critical when characterizing the composition of intestinal microbiota. Therefore, we aimed to understand the effects of different fecal storage methods to characterize intestinal microbiota using Next Generation Sequencing (NGS) as well as to establish an alternative conservation method of bacterial genetic material in these samples using guanidine. Stool samples from 10 healthy volunteers were collected. Each sample was divided into five aliquots: one aliquot was extracted immediately after collection (fresh) and two aliquots were subjected to freezing at -20 °C or -80 °C and extracted after 48 h. The other two aliquots were stored in guanidine at room temperature or 4 °C and extracted after 48 h. The V4 hypervariable regions of the bacterial and archeal 16S rRNA gene were amplified by PCR and sequenced using an Ion Torrent PGM platform for NGS. The data were analyzed using QIIME software. Statistical significance was determined using a non-parametric Kruskal-Wallis test. A total of 11,494,688 reads with acceptable quality were obtained. Unweighted principal coordinate analysis (PCoA) revealed that the samples were clustered based on the host rather than by the storage group. At the phylum and genus levels, we observed statistically significant differences between two genera, Proteobacteria (p=0.013) and Suterella (p=0.004), comparing frozen samples with guanidine-stored samples. Our data suggest that the use of guanidine can preserve bacterial genetic materials as well as freezing, providing additional conveniences.
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Affiliation(s)
- Roberto Marques Ribeiro
- Universidade de São Paulo, Faculdade de Medicina, Departamento de Moléstias Infecciosas, São Paulo, São Paulo, Brazil.,Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Laboratório de Parasitologia (LIM 46), São Paulo, São Paulo, Brazil
| | - Marcela de Souza-Basqueira
- Universidade de São Paulo, Faculdade de Medicina, Departamento de Moléstias Infecciosas, São Paulo, São Paulo, Brazil.,Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Laboratório de Parasitologia (LIM 46), São Paulo, São Paulo, Brazil
| | - Léa Campos de Oliveira
- Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Laboratório de Medicina Laboratorial (LIM 03), São Paulo, São Paulo, Brazil
| | - Flavia Cristina Salles
- Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Laboratório de Parasitologia (LIM 46), São Paulo, São Paulo, Brazil
| | - Natalia Bueno Pereira
- Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Laboratório de Parasitologia (LIM 46), São Paulo, São Paulo, Brazil
| | - Ester Cerdeira Sabino
- Universidade de São Paulo, Faculdade de Medicina, Departamento de Moléstias Infecciosas, São Paulo, São Paulo, Brazil.,Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Laboratório de Parasitologia (LIM 46), São Paulo, São Paulo, Brazil.,Universidade de São Paulo, Instituto de Medicina Tropical de São Paulo, São Paulo, São Paulo, Brazil
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