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Pessoa-E-Silva R, Oliveira PSSD, Gonçalves SMC, Guarines KM, Carvalho LVDN, Correia MAB, Rosa MMD, Rêgo MJBDM, Pitta MGDR, Pereira MC. Enhanced rapid commercial DNA extraction kit for the molecular detection of severe acute respiratory syndrome coronavirus 2: Easy adaptation to current protocols. Rev Soc Bras Med Trop 2021; 54:e0270. [PMID: 34787260 PMCID: PMC8582969 DOI: 10.1590/0037-8682-0270-2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 08/20/2021] [Indexed: 11/26/2022] Open
Abstract
INTRODUCTION Herein, the authors describe a simple enhancement to a commercial rapid DNA extraction kit based on simple viral lysis for detecting COVID-19 via RT-qPCR. METHODS After testing several different modifications, the adapted protocol with the best results in preliminary experiments was statistically evaluated in comparison with an automated robotic protocol. RESULTS Processing and testing of 119 nasopharyngeal samples ultimately yielded near-perfect agreement with the automated protocol (κ = 0.981 [95% confidence interval 0.943-1.000]). CONCLUSIONS The low cost and rapidity of the enhanced protocol makes it suitable for adoption in laboratories diagnosing COVID-19, especially those with high demand for examinations.
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Affiliation(s)
- Rômulo Pessoa-E-Silva
- Universidade Federal de Pernambuco, Núcleo de Pesquisa em Inovação Terapêutica - Suely Galdino, Recife, PE, Brasil
| | | | | | - Klarissa Miranda Guarines
- Universidade Federal de Pernambuco, Núcleo de Pesquisa em Inovação Terapêutica - Suely Galdino, Recife, PE, Brasil
| | | | | | - Michelle Melgarejo da Rosa
- Universidade Federal de Pernambuco, Núcleo de Pesquisa em Inovação Terapêutica - Suely Galdino, Recife, PE, Brasil.,Universidade Federal de Pernambuco, Departamento de Bioquímica, Recife, PE, Brasil
| | - Moacyr Jesus Barreto de Melo Rêgo
- Universidade Federal de Pernambuco, Núcleo de Pesquisa em Inovação Terapêutica - Suely Galdino, Recife, PE, Brasil.,Universidade Federal de Pernambuco, Departamento de Bioquímica, Recife, PE, Brasil
| | - Maira Galdino da Rocha Pitta
- Universidade Federal de Pernambuco, Núcleo de Pesquisa em Inovação Terapêutica - Suely Galdino, Recife, PE, Brasil.,Universidade Federal de Pernambuco, Departamento de Bioquímica, Recife, PE, Brasil
| | - Michelly Cristiny Pereira
- Universidade Federal de Pernambuco, Núcleo de Pesquisa em Inovação Terapêutica - Suely Galdino, Recife, PE, Brasil.,Universidade Federal de Pernambuco, Departamento de Fisiologia e Farmacologia, Recife, PE, Brasil
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Namvar L, Olofsson S, Bergström T, Lindh M. Detection and typing of Herpes Simplex virus (HSV) in mucocutaneous samples by TaqMan PCR targeting a gB segment homologous for HSV types 1 and 2. J Clin Microbiol 2005; 43:2058-64. [PMID: 15872222 PMCID: PMC1153722 DOI: 10.1128/jcm.43.5.2058-2064.2005] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Herpes simplex virus types 1 (HSV-1) and 2 (HSV-2) are major causes of mucocutaneous lesions and severe infections of the central nervous system. Here a new semiautomated method for detecting and typing of HSV was used to analyze 479 mucocutaneous swab samples. After DNA extraction using a Magnapure LC robot, a 118-bp segment of the gB region was amplified by real-time PCR utilizing type-specific TaqMan probes to identify HSV-1 or HSV-2. HSV detection in a single well using probes labeled with carboxyfluorescein (FAM) for HSV-1 and JOE (6-carboxy-4',5'-dichloro-2',7'-dimethoxyfluorescein) for HSV-2 had a sensitivity similar to that seen in separate reactions. All but one of 217 samples (99.5%) that had been positive by virus culture were positive by TaqMan PCR, with a correct identification of type in all cases. Out of 262 samples negative by virus culture, 48 (18.3%) were positive by TaqMan PCR, with higher Ct values compared with culture positive samples (P < 0.0001). Overall, the Ct values for HSV-1 were lower than for HSV-2 (mean, 25.5 versus 27.9), but to some extent this could be due to weaker fluorescence by JOE. Lower C(t) values for HSV-1 were seen also in the 202 genital samples (79 HSV-1, 122 HSV-2, 1 HSV-1 and HSV-2), indicating that HSV-1 replicates as well as HSV-2 in the genital area. HSV-1 constituted 40% of genital infections and was associated with lower mean age (29.2 versus 36.4 years), probably reflecting the fact that recurrent genital HSV-1 infections are rare.
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Affiliation(s)
- Lilly Namvar
- Department of Clinical Virology, Göteborg University, Guldhedsgatan 10B, 413 46 Göteborg, Sweden
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Li Y, Pan Z, Ji Y, Sheppard M, Jeffries DJ, Archard LC, Zhang H. Herpes simplex virus type 1 infection associated with atrial myxoma. THE AMERICAN JOURNAL OF PATHOLOGY 2004; 163:2407-12. [PMID: 14633612 PMCID: PMC1892371 DOI: 10.1016/s0002-9440(10)63595-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Some findings suggest an infectious factor in cardiac myxoma and certain histopathological features indicate herpes simplex virus type 1 (HSV-1) infection. We hypothesized that HSV-1 may be involved in the pathogenesis of cardiac myxoma. Paraffin-embedded tissue samples from 17 patients with atrial myxoma were investigated for HSV-1 antigen by immunohistochemistry and viral genomic DNA by nested polymerase chain reaction. The histogenesis and oncogenesis of atrial myxoma were assessed by the expression of calretinin, Ki67, and p53 protein, respectively. Autopsy myocardial samples, including endocardium from 12 patients who died by accident or other conditions, were used for comparison. HSV-1 antigen was detected in atrial myxoma from 12 of 17 patients: 8 of these 12 samples were positive also for HSV-1 DNA. No HSV-1 antigen or DNA was found in tissue from the comparison group. Antigens of HSV-2, varicella-zoster virus, Epstein-Barr virus, and cytomegalovirus were not found in atrial myxoma. Calretinin was found in myxoma cells of all 17 cases but Ki67 was present only in smooth muscle cells or infiltrating cells in some cases. p53 was not detectable in any myxoma. Most infiltrating cells were cytotoxic T lymphocytes. These data suggest that HSV-1 infection is associated with some cases of sporadic atrial myxoma and that these may result from a chronic inflammatory lesion of endocardium.
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Affiliation(s)
- Yanwen Li
- Division of Biomedical Sciences, Imperial College Faculty of Medicine, London, United Kingdom
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