scholarly journals Persistence of positive RT-PCR results for over 70 days in two travelers with COVID-19

2020 ◽  
pp. 1-7
Author(s):  
Theo-Ben Kandetu ◽  
Eric J. Dziuban ◽  
Kaveto Sikuvi ◽  
Rachel S. Beard ◽  
Reginald Nghihepa ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Real Time ◽  
Reverse Transcription ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Viral Detection ◽  
Polymerase Chain

Abstract The relation of continuing to test positive for SARS-CoV-2 by reverse transcription real-time polymerase chain reaction (RT-PCR) to infectivity remains unclear, with numerous consequences. This report describes two patients with persistent viral detection by RT-PCR for 77 and 72 days, longer than other reported cases who were otherwise healthy.

1504: Molecular Diagnosis and Staging of Prostate Cancer Using Clusterin in Real Time Reverse Transcription Polymerase Chain Reaction (RT-PCR)

2006 ◽  
Vol 175 (4S) ◽  
pp. 485-486
Author(s):  
Sabarinath B. Nair ◽  
Christodoulos Pipinikas ◽  
Roger Kirby ◽  
Nick Carter ◽  
Christiane Fenske
Keyword(s):  
Prostate Cancer ◽  
Polymerase Chain Reaction ◽  
Real Time ◽  
Molecular Diagnosis ◽  
Reverse Transcription ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Polymerase Chain

scholarly journals Evaluation of a 384–Well Format for High-Throughput Real-Time Reverse Transcription Polymerase Chain Reaction for Avian Influenza Testing

2009 ◽  
Vol 21 (5) ◽  
pp. 679-683 ◽  
Author(s):  
Pamela J. Ferro ◽  
Jason Osterstock ◽  
Bo Norby ◽  
Geoffrey T. Fosgate ◽  
Blanca Lupiani
Keyword(s):  
Polymerase Chain Reaction ◽  
Avian Influenza ◽  
Real Time ◽  
High Throughput ◽  
Reverse Transcription ◽  
Virus Isolation ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Response Planning ◽  
Polymerase Chain

As concerns over the global spread of highly pathogenic avian influenza H5N1 have heightened, more countries are faced with increased surveillance efforts and incident response planning for handling a potential outbreak. The incorporation of molecular techniques in most diagnostic laboratories has enabled fast and efficient testing of many agents of concern, including avian influenza. However, the need for high-throughput testing remains. In this study, the use of a 384–well format for high-throughput real-time reverse transcription polymerase chain reaction (real-time RT-PCR) testing for avian influenza is described. The analytical sensitivity of a real-time RT-PCR assay for avian influenza virus matrix gene with the use of both 96– and 384–well assay formats and serial dilutions of transcribed control RNA were comparable, resulting in similar limits of detection. Of 28 hunter-collected cloacal swabs that were positive by virus isolation, 26 (92.9%) and 27 (96.4%) were positive in the 96– and 384–well assays, respectively; of the 340 hunter-collected swabs that were negative by virus isolation, 45 (13.2%) and 23 (6.8%) were positive in the 96– and 384–well assays, respectively. The data presented herein supports the utility of the 384–well format in the event of an avian influenza outbreak for high-throughput real-time RT-PCR testing.

Increased detection of rotavirus using a real time reverse transcription-polymerase chain reaction (RT-PCR) assay in stool specimens from children with diarrhea

2004 ◽  
Vol 72 (3) ◽  
pp. 496-501 ◽  
Author(s):  
Xiaoli L. Pang ◽  
Bonita Lee ◽  
Nasim Boroumand ◽  
Barbara Leblanc ◽  
Jutta K. Preiksaitis ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Real Time ◽  
Reverse Transcription ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Pcr Assay ◽  
Stool Specimens ◽  
Polymerase Chain

scholarly journals Real-time fluorogenic reverse transcription polymerase chain reaction assay for the specific detection of Bagaza virus

2012 ◽  
Vol 24 (5) ◽  
pp. 959-963 ◽  
Author(s):  
Dolores Buitrago ◽  
Ana Rocha ◽  
Cristina Tena-Tomás ◽  
Marta Vigo ◽  
Montserrat Agüero ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Real Time ◽  
Reverse Transcription ◽  
Diagnostic Methods ◽  
Nucleotide Sequencing ◽  
Alectoris Rufa ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Field Samples ◽  
Polymerase Chain

In September 2010, an outbreak of disease in 2 wild bird species (red-legged partridge, Alectoris rufa; ring-necked pheasant, Phasianus colchicus) occurred in southern Spain. Bagaza virus (BAGV) was identified as the etiological agent of the outbreak. BAGV had only been reported before in Western Africa (Central African Republic, Senegal) and in India. The first occurrence of BAGV in Spain stimulated a demand for rapid, reliable, and efficacious diagnostic methods to facilitate the surveillance of this disease in the field. This report describes a real-time reverse transcription polymerase chain reaction (RT-PCR) method based on a commercial 5’-Taq nuclease-3’ minor groove binder DNA probe and primers targeting the Bagaza NS5 gene. The method allowed the detection of BAGV with a high sensitivity, whereas other closely related flaviviruses ( Usutu virus, West Nile virus, and Japanese encephalitis virus) were not detected. The assay was evaluated using field samples of red-legged partridges dead during the outbreak ( n = 11), as well as samples collected from partridges during surveillance programs ( n = 81). The results were compared to those obtained with a pan-flaviviral hemi-nested RT-PCR followed by nucleotide sequencing, which was employed originally to identify the virus involved in the outbreak. The results obtained with both techniques were 100% matching, indicating that the newly developed real-time RT-PCR is a valid technique for BAGV genome detection, useful in both diagnosis and surveillance studies.

scholarly journals Molecular (real-time reverse transcription polymerase chain reaction) diagnosis of SARS-CoV-2 infections: complexity and challenges

2021 ◽  
Vol 45 (3) ◽  
pp. 135-142
Author(s):  
Shneh Sethi ◽  
Trinad Chakraborty
Keyword(s):  
Polymerase Chain Reaction ◽  
Real Time ◽  
Reverse Transcription ◽  
Fatal Outcome ◽  
Respiratory Illness ◽  
World Health ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Polymerase Chain ◽  
Pcr Assays

Abstract The outbreak of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first recorded in Wuhan, China. The World Health Organization initially classified COVID-19 as a public health emergency and subsequently declared the disease a global pandemic. COVID-19 can take at least three distinct forms: severe acute distress syndrome with a potentially fatal outcome, mild respiratory illness (pneumonia with eventual recovery) and asymptomatic infection. All three disease forms have the potential to transmit the infection to healthy contacts. At present, real-time reverse transcription polymerase chain reaction (RT-PCR) is the only available laboratory tool to confirm the presence of viral RNA in patient specimens. These assays are designed to detect one or more (at least 2) SARS-CoV-2 RNA gene targets allowing the detection of the virus. Commercially available RT-PCR assays employ various gene targets of the viral genome in their assay systems. Additionally, there are differences in primer selection for the same gene region of SARS-CoV-2. At present, it is unclear whether the results from different RT-PCR assays are comparable in detecting the spectrum of COVID-19 manifestations. The purpose of the present article is twofold: first, to briefly focus on the findings of these reports; and second, to emphasize the various challenges and flaws that can potentially impact the diagnostic accuracy of RT-PCR testing for SARS-CoV-2.

scholarly journals Pandemic (H1N1) 2009 Cases in Nepal

2012 ◽  
Vol 52 (188) ◽  
Author(s):  
N Kandel ◽  
J M Shrestha ◽  
B Upadhyay ◽  
A K Shrestha ◽  
G Shakya
Keyword(s):  
Polymerase Chain Reaction ◽  
Real Time ◽  
Reverse Transcription ◽  
Pandemic Influenza ◽  
Influenza A ◽  
Pandemic H1n1 ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Polymerase Chain ◽  
Keywords Influenza

We analyzed the data available in Nepal during this pandemic in order to determine the epidemiological, clinical and virological characteristics of pandemic influenza A in 2009. The test was conducted by real-time Reverse Transcription – Polymerase Chain Reaction on sample from patients with suspected influenza-like illnesses. Out of 538 cases were tested, 32 % were positive for pandemic influenza A 2009 and the infection rate was highest for cases of 11-20 years and lowest in >50 years of age. Keywords: Influenza A ; pandemic; RT-PCR; surveillance.

scholarly journals Clinical Usefulness of Nested Reverse-Transcription Polymerase Chain Reaction for the Diagnosis of Severe Fever with Thrombocytopenia Syndrome

2021 ◽  
Author(s):  
Choon Mee Kim ◽  
Dong-Min Kim ◽  
Na-Ra Yun
Keyword(s):  
Polymerase Chain Reaction ◽  
Real Time ◽  
Reverse Transcription ◽  
Immunofluorescence Assay ◽  
Clinical Usefulness ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Polymerase Chain ◽  
Pcr Targeting ◽  
Severe Fever

Severe fever with thrombocytopenia syndrome (SFTS), caused by SFTS virus (SFTSV) is an emerging tick-borne infectious disease. Few studies have assessed the clinical usefulness of nested reverse-transcription polymerase chain reaction (RT-PCR) for diagnosing SFTS. We performed conventional RT-PCR targeting the M segment, nested RT-PCR targeting M and S segments, and real-time RT-PCR targeting the S segment of SFTSV for four patients with suspected SFTS. Although conventional RT-PCR results for the first two patients were negative at admission, nested RT-PCR using the S or M targets was positive for the same samples. Likewise, in the other two patients, initial samples were confirmed positive in all three tests, but follow-up testing demonstrated negative conventional RT-PCR and positive nested RT-PCR results. Thus, delayed testing using conventional RT-PCR or real-time RT-PCR in symptomatic patients with SFTS may result in missed diagnoses, and compared with these methods, nested RT-PCR may increase the window for obtaining positive SFTSV PCR results. Meanwhile, the indirect immunofluorescence assay showed seroconversion to SFTSV antibodies in all four patients. Nested RT-PCR for SFTSV M and S segments could help diagnose SFTS in patients testing negative by conventional RT-PCR.

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