scholarly journals Clarifying Indeterminate Results on the Rabies Direct Fluorescent Antibody Test Using Real-Time Reverse Transcriptase Polymerase Chain Reaction

2018 ◽  
Vol 134 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Kim Appler ◽  
Scott Brunt ◽  
Jodie A. Jarvis ◽  
April D. Davis
Keyword(s):  
Real Time ◽  
Rabies Virus ◽  
Fluorescent Antibody ◽  
Antibody Test ◽  
The United States ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Virus Variant ◽  
Direct Fluorescent Antibody ◽  
Polymerase Chain

Objectives: Each year, rabies virus infection results in the death of more than 50 000 persons worldwide. In the United States, the Centers for Disease Control and Prevention (CDC) reported 23 human rabies cases from May 1, 2008, through October 1, 2017. Although rabies testing in the United States is highly reliable, some specimens submitted to rabies laboratories do not have adequate tissues or may be substantially decomposed. In these instances, the specimen may be considered unsatisfactory for testing or produce indeterminate results using the gold standard direct fluorescent antibody test. The objective of this study was to evaluate the number of unsatisfactory samples or samples with indeterminate results that were positive for rabies virus after additional testing using real-time reverse transcriptase polymerase chain reaction (RT-PCR). Methods: In 2016, we retested all unsatisfactory specimens or specimens with indeterminate results using real-time RT-PCR. We further typed any sample that was real-time RT-PCR positive to identify the infecting rabies virus variant. Results: Of 210 retested unsatisfactory specimens or specimens with indeterminate results, 9 (4.3%) were positive for rabies. In each case, the animal was infected with a homologous rabies virus variant. Conclusion: These results confirm the recommendation by CDC and state public health laboratories that indeterminate results should be considered positive and justify the prompt treatment of exposed persons through an animal that is suspected to have rabies.

scholarly journals Importation of canid rabies in a horse relocated from Zimbabwe to South Africa : research communication

2005 ◽  
Vol 72 (1) ◽  
Author(s):  
C.T. Sabeta ◽  
J.L. Randles
Keyword(s):  
South Africa ◽  
Rabies Virus ◽  
Fluorescent Antibody ◽  
Clinical Signs ◽  
Antibody Test ◽  
Domestic Dog ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Training Centre ◽  
Polymerase Chain

In July 2003 a 2-year-old Thoroughbred colt was imported from Harare, Zimbabwe to the Ashburton Training Centre, Pietermaritzburg, South Africa. Five months after importation, the colt presented with clinical signs suggestive of rabies: it was uncoordinated, showed muscle tremors and was biting at itself. Brain tissue was submitted for analysis and the clinical diagnosis was confirmed by the fluorescent antibody test and reverse-transcription polymerase chain reaction (RT-PCR). Phylogenetic analysis of the nucleotide sequence of the cytoplasmic domain of the glycoprotein and the G-L intergenic region of the rabies virus confirmed it to be an infection with a canid rabies virus, originating from an area in Zimbabwe endemic for the domestic dog (Canis familiaris) and side-striped jackal (Canis adustus) rabies.

scholarly journals A Comparative Analysis of Polymerase Chain Reaction and Direct Fluorescent Antibody Test for Diagnosis of Genital Herpes

2017 ◽  
Vol 9 (01) ◽  
pp. 053-056 ◽  
Author(s):  
Vrushali Patwardhan ◽  
Preena Bhalla ◽  
Deepti Rawat ◽  
Vijay Kumar Garg ◽  
Kabir Sardana ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Genital Herpes ◽  
Fluorescent Antibody ◽  
Antibody Test ◽  
Conventional Polymerase Chain Reaction ◽  
Genital Ulcer ◽  
Chain Reaction ◽  
Direct Fluorescent Antibody ◽  
Polymerase Chain ◽  
Simplex Virus

ABSTRACT Objective: To compare laboratory tests that can simultaneously detect and type herpes simplex virus (HSV) directly from the genital ulcer specimens in clinically suspected cases of genital herpes. Materials and Methods: A study was conducted over 10 months and 44 adult male and female patients clinically suspected with genital herpes were recruited. Genital ulcer swab specimens were subjected to glycoprotein-G gene-based conventional polymerase chain reaction (PCR) and commercially available direct fluorescent antibody (DFA) test and the results were compared. Results: PCR for HSV was positive in 82% (36/44) cases. DFA was positive in 68.2% (30/44) cases. There was 100% agreement between HSV types detected by DFA and PCR. The strength of agreement between the results was better in primary genital herpes than recurrent cases. Conclusion: PCR was found to be better in the detection of HSV in recurrent genital herpes patients. It is a better modality, especially when genital herpes clinically presents with ulcerative or crusted lesions, and is also a cheaper alternative as compared to DFA.

scholarly journals Real-Time RT-PCR for the Detection of Lyssavirus Species

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
A. Deubelbeiss ◽  
M.-L. Zahno ◽  
M. Zanoni ◽  
D. Bruegger ◽  
R. Zanoni
Keyword(s):  
Real Time ◽  
Rabies Virus ◽  
Fluorescent Antibody ◽  
Fatal Outcome ◽  
Antibody Test ◽  
Rt Pcr ◽  
Causative Agents ◽  
Rabies Virus Strain ◽  
Rabies Diagnosis

The causative agents of rabies are single-stranded, negative-sense RNA viruses in the genus Lyssavirus of Rhabdoviridae, consisting of twelve classified and three as yet unclassified species including classical rabies virus (RABV). Highly neurotropic RABV causes rapidly progressive encephalomyelitis with nearly invariable fatal outcome. Rapid and reliable diagnosis of rabies is highly relevant for public and veterinary health. Due to growing variety of the genus Lyssavirus observed, the development of suitable molecular assays for diagnosis and differentiation is challenging. This work focused on the establishment of a suitable real-time RT-PCR technique for rabies diagnosis as a complement to fluorescent antibody test and rabies tissue culture infection test as gold standard for diagnosis and confirmation. The real-time RT-PCR was adapted with the goal to detect the whole spectrum of lyssavirus species, for nine of which synthesized DNA fragments were used. For the detection of species, seven probes were developed. Serial dilutions of the rabies virus strain CVS-11 showed a 100-fold higher sensitivity of real-time PCR compared to heminested RT-PCR. Using a panel of thirty-one lyssaviruses representing four species, the suitability of the protocol could be shown. Phylogenetic analysis of the sequences obtained by heminested PCR allowed correct classification of all viruses used.

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 Utility of forensic detection of rabies virus in decomposed exhumed dog carcasses

2015 ◽  
Vol 86 (1) ◽  
Author(s):  
Wanda Markotter ◽  
Jessica Coertse ◽  
Kevin Le Roux ◽  
Joey Peens ◽  
Jacqueline Weyer ◽  
...  
Keyword(s):  
Rabies Virus ◽  
Gold Standard ◽  
Diagnostic Method ◽  
Diagnostic Testing ◽  
Domestic Dogs ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Brain Material ◽  
Polymerase Chain ◽  
Genomic Material

This report describes four suspected rabies cases in domestic dogs that were involved inhuman exposures. In all these cases, the animals were buried for substantial times beforerabies testing was performed. Animal rabies is endemic in South Africa and domestic dogsare the main vector for transmission to humans. Diagnosis of rabies in humans is complicated,and diagnosis in the animal vector can provide circumstantial evidence to support clinicaldiagnosis of rabies in humans. The gold standard diagnostic method, fluorescent antibodytest (FAT), only delivers reliable results when performed on fresh brain material and thereforedecomposed samples are rarely submitted for diagnostic testing. Severely decomposed brainmaterial was tested for the presence of rabies virus genomic material using a quantitativereal-time reverse transcription polymerase chain reaction (q-real-time RT-PCR) assaywhen conventional molecular methods were unsuccessful. This may be a useful tool in theinvestigation of cases where the opportunity to sample the suspected animals post mortem wasforfeited and which would not be possible with conventional testing methodologies becauseof the decomposition of the material.

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