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In JoVE (1)
Other Publications (2)
Articles by Sonia Montenegro in JoVE
Detection and Genogrouping of Noroviruses from Children's Stools By Taqman One-step RT-PCR
Sonia Apaza1, Susan Espetia1, Robert H. Gilman1,2, Sonia Montenegro3, Susana Pineda3, Fanny Herhold1, Romeo Pomari1, Margaret Kosek2, Nancy Vu1, Mayuko Saito1,2,4
1Laboratorio de Investigación y Desarrollo (LID), Universidad Peruana Cayetano Heredia, 2Bloomberg School of Public Health, Johns Hopkins University, 3Laboratorio de Diagnostico Molecular, Facultad de Medicina, University of Concepcion,Chile, 4University of California San Diego School of Medicine
A One-Step RT-PCR assay for detection and genogroup identification of Norovirus isolates from children’s stools, that utilizes primers and TaqMan probes specific to the open reading frame 1 (ORF1)-ORF2 junction region, the most conserved region of the Norovirus genome is described. A non-commercial, cost-effective RNA extraction method is detailed.
Other articles by Sonia Montenegro on PubMed
The American Journal of Tropical Medicine and Hygiene. Dec, 2008 | Pubmed ID: 19052299
Pediatric pulmonary tuberculosis diagnosis is difficult because young children are unable to expectorate sputum samples. Testing stool for tuberculosis DNA from swallowed sputum may diagnose pulmonary tuberculosis. Hospitalized children with suspected tuberculosis had stool, nasopharyngeal, and gastric aspirates cultured that confirmed pulmonary tuberculosis in 16/236 patients. Twenty-eight stored stools from these 16 children were used to evaluate stool polymerase chain reaction (PCR) for tuberculosis diagnosis compared with 28 stool samples from 23 healthy control children. Two DNA extraction techniques were used: fast-DNA mechanical homogenization and Chelex-resin chemical extraction. DNA was tested for tuberculosis DNA with a hemi-nested IS6110 PCR. PCR after Fast-DNA processing was positive for 6/16 culture-proven tuberculosis patients versus 5/16 after Chelex extraction (sensitivity 38% and 31%, respectively). All controls were negative (specificity 100%). If sensitivity can be increased, stool PCR would be a rapid, non-invasive, and relatively bio-secure initial test for children with suspected pulmonary tuberculosis.
Diagnostic Approaches for Paediatric Tuberculosis by Use of Different Specimen Types, Culture Methods, and PCR: a Prospective Case-control Study
The Lancet Infectious Diseases. Sep, 2010 | Pubmed ID: 20656559
The diagnosis of pulmonary tuberculosis presents challenges in children because symptoms are non-specific, specimens are difficult to obtain, and cultures and smears of Mycobacterium tuberculosis are often negative. We assessed new diagnostic approaches for tuberculosis in children in a resource-poor country.