scholarly journals Determination of Bovine Rotavirus G and P Serotypes in Italy by PCR

1999 ◽  
Vol 37 (12) ◽  
pp. 3879-3882 ◽  
Author(s):  
E. Falcone ◽  
M. Tarantino ◽  
L. Di Trani ◽  
P. Cordioli ◽  
A. Lavazza ◽  
...  
Keyword(s):  
Reverse Transcription ◽  
Clinical Signs ◽  
Specific Primers ◽  
Bovine Rotavirus ◽  
Reverse Transcription Pcr ◽  
Rotavirus Vaccines ◽  
Intestinal Contents ◽  
Group A

Determination of the G and P serotypes of group A bovine rotaviruses from 149 samples of feces or intestinal contents collected from calves showing clinical signs of neonatal diarrhea was performed by a nested reverse transcription-PCR typing assay. The G6 serotype was the most prevalent, accounting for viruses in 55.7% of the samples; viruses of the G10 and G8 serotypes were found in 34.9 and 4.7% of the samples, respectively. The virus in one sample (0.7%) was not classified due to concomitant infection with G6 and G8 strains, whereas viruses in six samples (4.0%) could not be characterized with any of the three G serotype-specific primers selected for the present study. When examined for their P-serotype specificities, viruses in 55 and 42.3% of the samples were characterized as P[11] and P[5], respectively, no P[1] serotype was identified, and viruses in 2.7% of the samples could not be classified due to multiple reactivity with both P[5]- and P[11]-specific primers. Various combinations of G and P serotypes were observed, the most frequent being G6,P[5] (38.3%), G10,P[11] (31.5%), and G6,P[11] (15.4%). The results of the present study, while contributing to a better understanding of the epidemiology of bovine rotaviruses in Italy, address the relevance of serotype specificity with regard to the constancy of the quality of bovine rotavirus vaccines under different field conditions.

scholarly journals Prevalence and genotype distribution of group A rotavirus circulating in Shanxi Province, China during 2015–2019

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Lifeng Zhao ◽  
Xiaohong Shi ◽  
Dequan Meng ◽  
Jiane Guo ◽  
Yiping Li ◽  
...  
Keyword(s):  
Reverse Transcription ◽  
Shanxi Province ◽  
Nucleotide Sequencing ◽  
Genotype Distribution ◽  
Infection Frequency ◽  
Group A Rotavirus ◽  
Reverse Transcription Pcr ◽  
Rotavirus Vaccines ◽  
Infectious Gastroenteritis ◽  
Group A

Abstract Background Group A rotavirus (RVA), despite being a leading cause of gastroenteritis in infants and young children, is less studied in Shanxi Province, China. The current study was conducted to determine the prevalence and genetic characterization of RVA in hospitalized children younger than 10 years of age with the diagnosis of acute gastroenteritis in Shanxi Province, China. Methods A hospital-based active surveillance of rotavirus gastroenteritis was conducted at Children’s Hospital of Shanxi from Jan 1, 2015, through Dec 31, 2019. Rotavirus was detected in stool samples by real-time quantitative reverse transcription PCR (qRT-PCR). G- and P-genotypes were determined by reverse transcription PCR (RT-PCR) and nucleotide sequencing. Results A total of 961 children younger than 10 years of age was enrolled over the study period, of whom 183 (19.0%) were positive for RVA. The highest RVA-infection frequency (23.7%) was found among children aged 12–23 months, and the seasonal peak was in December. G9P[8] was most prevalent (76.0%), followed by G3P[8] (7.1%), G2P[4] (3.3%), G1P[8] (0.5%) and G9P[4] (0.5%). Conclusions These results report for the first time that RVA was one of the main causes of severe infectious gastroenteritis in children, and a high proportion of G9P[8] strains circulating in most areas of Shanxi Province. While the protective efficacy of the rotavirus vaccines has been demonstrated against G9P[8] strains, our results highlight that the dominant strains have not been effectively controlled in China.

scholarly journals Prevalence and Genotype Distribution of Group A Rotavirus Circulating in Shanxi Province, China During 2015-2019

2020 ◽  
Author(s):  
Lifeng Zhao ◽  
Xiaohong Shi ◽  
Dequan Meng ◽  
Jiane Guo ◽  
Yiping Li ◽  
...  
Keyword(s):  
Reverse Transcription ◽  
Shanxi Province ◽  
Nucleotide Sequencing ◽  
Genotype Distribution ◽  
Infection Frequency ◽  
Group A Rotavirus ◽  
Reverse Transcription Pcr ◽  
Rotavirus Vaccines ◽  
Infectious Gastroenteritis ◽  
Group A

Abstract Background: Group A rotavirus (RVA), despite being a leading cause of gastroenteritis in infants and young children, is less studied in Shanxi Province, China. The current study was conducted to determine the prevalence and genetic characterization of RVA in hospitalized children under ten years old with the diagnosis of gastroenteritis in Shanxi Province, China. Methods: A hospital-based active surveillance of rotavirus gastroenteritis was conducted at Children’s Hospital of Shanxi from January 1, 2015, through December 31, 2019. Rotavirus was detected in stool samples by real-time quantitative reverse transcription PCR (qRT-PCR). G and P genotypes were determined by reverse transcription PCR (RT-PCR) and nucleotide sequencing. Results：A total of 961 archived stool specimens was examined, 183 (19.0%) were positive for RVA. The highest RVA-infection frequency (23.7%) was found among children aged 12–23 months, and the seasonal peak was in December. G9P[8] was most prevalent (76.0%), followed by G3P[8] (7.1 %), G2P[4] (3.3 %), G1P[8] (0.5 %) and G9P[4] (0.5 %).Conclusions: These results reported for the first time that RVA was one of the main causes of severe infectious gastroenteritis in children, and a high proportion of G9P[8] strains circulating in most areas of Shanxi Province. While the protective efficacy of the rotavirus vaccines has been demonstrated against G9P[8] strains, our results highlight that the dominant strains have not been effectively controlled in China.

Development of a real-time reverse transcription-PCR assay to detect and quantify group A rotavirus equine-like G3 strains

2021 ◽  
Author(s):  
Eric M. Katz ◽  
Mathew D. Esona ◽  
Rashi Gautam ◽  
Michael D. Bowen
Keyword(s):  
Viral Load ◽  
Real Time ◽  
Reverse Transcription ◽  
Dynamic Range ◽  
Limit Of Detection ◽  
Human Populations ◽  
Pcr Assay ◽  
Group A Rotavirus ◽  
Reverse Transcription Pcr ◽  
Group A

Since 2013, group A rotavirus strains characterized as novel DS-1-like inter-genogroup reassortant ‘equine-like G3’ strains have emerged and spread across five continents among human populations in at least 14 countries. Here we report a novel one-step TaqMan quantitative real-time reverse transcription-PCR assay developed to genotype and quantify the viral load for samples containing rotavirus equine-like G3 strains. Using a universal G forward primer and a newly designed reverse primer and TaqMan probe, we developed and validated an assay with a linear dynamic range of 2.3 × 10 9 – 227 copies per reaction and a limit of detection of 227 copies. The percent positive agreement, percent negative agreement, and precision of our assay were 100.00%, 99.63%, and 100.00%, respectively. This assay can simultaneously detect and quantify the viral load for samples containing DS-1-like inter-genogroup reassortant equine-like G3 strains with high sensitivity and specificity, faster turnaround time, and decreased cost and will be valuable for high-throughput screening of stool samples collected to monitor equine-like G3 strain prevalence and circulation among human populations throughout the world.

scholarly journals mRNA Detection by Reverse Transcription-PCR for Monitoring Viability over Time in an Enterococcus faecalis Viable but Nonculturable Population Maintained in a Laboratory Microcosm

2000 ◽  
Vol 66 (10) ◽  
pp. 4564-4567 ◽  
Author(s):  
Maria del Mar Lleò ◽  
Sabrina Pierobon ◽  
Maria Carla Tafi ◽  
Caterina Signoretto ◽  
Pietro Canepari
Keyword(s):  
Enterococcus Faecalis ◽  
Reverse Transcription ◽  
Microbiological Quality ◽  
Vbnc State ◽  
Viable But Nonculturable ◽  
Reverse Transcription Pcr ◽  
Pathogenic Factors ◽  
Laboratory Microcosm ◽  
Or Genes

ABSTRACT The viable but nonculturable (VBNC) state is a survival strategy adopted by bacteria when they are exposed to hostile environmental conditions. It has been shown that VBNC forms of bacteria are no longer capable of growing on conventional bacteriological media but conserve pathogenic factors and/or genes. It is thus necessary to develop methods capable of detecting nonculturable bacteria and of establishing their viability when the microbiological quality of environments is monitored. In this study we demonstrated that a gene was expressed during the VBNC state in a low-nutrient-concentration microcosm through detection of Enterococcus faecalis pbp5 mRNA by reverse transcription-PCR over a 3-month period. The presence of mRNA correlated with metabolic activity and resuscitation capability, indicating the viability of the VBNC cells.

scholarly journals Determination of Human Rotavirus VP6 Genogroups I and II by Reverse Transcription-PCR

2008 ◽  
Vol 46 (10) ◽  
pp. 3330-3337 ◽  
Author(s):  
Y.-P. Lin ◽  
C.-L. Kao ◽  
S.-Y. Chang ◽  
K. Taniguchi ◽  
P.-Y. Hung ◽  
...  
Keyword(s):  
Reverse Transcription ◽  
Reverse Transcription Pcr ◽  
Human Rotavirus ◽  
Rotavirus Vp6

scholarly journals Gastrodia elata powder capsule enhances anti-epileptic effect of carbamazepine by decreasing P-gp expression

2021 ◽  
Vol 18 (9) ◽  
pp. 1859-1865
Author(s):  
Xiangji Dang ◽  
Pei Zhao ◽  
Yan Liu ◽  
Long Qin ◽  
Haisheng Jiao
Keyword(s):  
Drug Resistance ◽  
Western Blot ◽  
Reverse Transcription ◽  
Normal Saline ◽  
Control Group ◽  
Behavioral Characteristics ◽  
Gastrodia Elata ◽  
Reverse Transcription Pcr ◽  
Protein Expressions

Purpose: To investigate the influence of Gastrodia elata powder capsule (GC) or gastrodin (GTD) on the anti-epileptic effect of carbamazepine (CBZ) on penicillin (PG)-induced epilepsy in rats. Methods: A total 116 rats were used in this study. Rats in the control group (n = 8) were injected with normal saline (NS) in place PG. Epilepsy was induced in the remaining 108 rats on the first day via PG injection. The rats were then divided randomly into six groups (18 rats per group): PG group, CBZ group, CBZ + GC group, CBZ + GTD group, GC group, and GTD group, which were given (p.o.) NS, CBZ (100 mg/kg), CBZ (100 mg/kg.) + GC (350 mg/kg), CBZ (100 mg/kg) + GTD (100 mg/kg), GC (350 mg/kg), and GTD (100 mg/kg), respectively, once a day for 15 days. The behavioral characteristics of the rats were observed and used to assess the anti-epileptic effect of the test drugs. Real-time quantitative reverse transcription-PCR and Western blot assays were employed for the determination of the effect of CBZ, GC and GTD on the expression levels of P-gp. Results: CBZ significantly reduced the symptoms of epilepsy, while GC and GTD enhanced the antiepileptic effect of CBZ, and reversed the CBZ-induced increases in the protein expressions of mrd1a and P-gp (p < 0.05). Conclusion: GC reverses CBZ drug resistance, probably through downregulation of P-gp expression. This finding indicates that GC is a potential anti-epilepsy drug, but it merits further studies.

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