scholarly journals Clinical evaluation of a new single-tube multiplex reverse transcription PCR assay for simultaneous detection of 11 respiratory viruses, Mycoplasma pneumoniae and Chlamydia in hospitalized children with acute respiratory infections

2017 ◽  
Vol 88 (2) ◽  
pp. 115-119 ◽  
Author(s):  
Meng-chuan Zhao ◽  
Gui-xia Li ◽  
Dan Zhang ◽  
Hang-yu Zhou ◽  
Hao Wang ◽  
...  
2019 ◽  
Vol 57 (4) ◽  
Author(s):  
Kanti Pabbaraju ◽  
Kara Gill ◽  
Anita A. Wong ◽  
Graham A. Tipples ◽  
Joanne Hiebert ◽  
...  

ABSTRACT Measles is one of the most contagious viral respiratory infections and was declared to be eliminated from Canada in 1998; however, measles cases and outbreaks still occur every year through reintroduction from other parts of the world. Laboratory confirmation of measles virus (MV) RNA by real-time PCR provides a definitive diagnosis, and molecular analysis to determine the genotype is the only way to distinguish between wild-type and vaccine strains. This distinction is important since live attenuated vaccine strains are able to replicate in the patient and can be associated with rash and fever but are poorly transmissible, if at all. Prompt reporting of measles cases to local authorities, including differentiation between wild-type and vaccine strains, allows for optimal management and contact tracing. The development and validation of a multiplex real-time reverse transcription-PCR (rtRT-PCR) assay for the simultaneous detection and differentiation of the Moraten and Schwarz vaccine strains from presumptive wild-type MV in a format that can be easily implemented for high-throughput testing of patient samples are reported here. This assay is sensitive, specific, reproducible, and 100% accurate in comparison with the gold standard comparator assay.


Author(s):  
Montaha Al-Iede ◽  
Lena Sarhan ◽  
Leen Abushanab ◽  
Tamara Ayasrah ◽  
Rafaa Al Maani ◽  
...  

Background: Influenza virus and other respiratory viruses have been identified as an essential cause of acute respiratory infections (ARIs) in children worldwide. However, there are few data on its frequency and clinical presentation in Jordan. Objectives: We aimed to identify the viral etiology of acute respiratory infections and the various clinical presentations in hospitalized children, especially those with influenza viruses compared to other respiratory viruses. Methods: A retrospective study that was conducted at the Jordan university hospital. All the positive nasopharyngeal aspirates that were collected from hospitalized children aged 0-19 years from January 2017 to January 2019 were reviewed. Results: A total of 338 nasopharyngeal aspirates (NPAs) with positive viral serology results were reviewed. Among the patients younger than four years, the RSV virus was the most frequently detected. However, the Influenza B virus was the most commonly seen in patients older than 5 years, H1N1 was more frequent in autumn (29.5%), and RSV was the most frequent virus in winter. Bronchopneumonia was the most frequent diagnosis among all hospitalized patients, followed by bronchiolitis. Out of 338 patients, 50.3 % had tachypnea, 70.7% of patients were admitted to the pediatric floor, while 18.6% presented with a severe illness and required admission to the pediatric intensive care unit (PICU). Infants under the age of one were more likely to have higher co-infection rates with other viruses compared to children over five years that had influenza. Conclusion: Presentations of influenza and other respiratory viruses vary between different age groups, such as sepsis in children younger than one year.


2011 ◽  
pp. 11-15
Author(s):  

Objective: To develop and apply a nested reverse transcription- polymerase chain reaction (nested RT-PCR) for detection of RSV in lower acute respiratory infections. Materials and methods: A nested reverse transcription- polymerase chain reaction was used to amplify a sequence of the F gene in the RSV genomic RNA, optimized and compared the sensitivity and specificity of this assay with the control samples and then applied this procedure for diagnosing RSV from clinical samples. Results: This nested RT-PCR assay amplified the specific target fragment of RSV RNA and did not amplify any sequence of genomes of the tested common viruses and bacteria causing respiratory infections. The minimal level of detection of this procedure was 102 copies/ml. Results for detection of RSV on 109 samples of throat swabs or nasopharyngeal swabs from children with lower respiratory infections showed that twenty seven patients were positive with RSV ( 24.8%), among which six out of 30 (20%) were with bronchitis, seven out of 26 ( 27%) were with bronchiolitis and fourteen out of 53 (26.4%) were with pneumonia. Conclusion: This nested RT-PCR was found to be useful and reliable for detection of RSV in respiratory infections.


Author(s):  
Fahimeh Sadat Aghamirmohammadali ◽  
Kaveh Sadeghi ◽  
Nazanin Zahra Shafiei-Jandaghi ◽  
Zahra Khoban ◽  
Talat Mokhtari-Azad ◽  
...  

Background and Objectives: Severe acute respiratory infections (SARI) remain an important cause for childhood morbid- ity worldwide. We designed a research with the objective of finding the frequency of respiratory viruses, particularly WU and KI polyomaviruses (WUPyV & KIPyV), human coronaviruses (HCoVs), human respiratory syncytial virus (HRSV) and human parechovirus (HPeV) in hospitalized children who were influenza negative. Materials and Methods: Throat swabs were collected from children younger than 5 years who have been hospitalized for SARI and screened for WUPyV, KIPyV, HCoVs, HRSV and HPeV using Real time PCR. Results: A viral pathogen was identified in 23 (11.16%) of 206 hospitalized children with SARI. The rate of virus detection was considerably greater in infants <12 months (78.2%) than in older children (21.8%). The most frequently detected vi- ruses were HCoVs with 7.76% of positive cases followed by KIPyV (2%) and WUPyV (1.5%). No HPeV and HRSV were detected in this study. Conclusion: This research shown respiratory viruses as causes of childhood acute respiratory infections, while as most of mentioned viruses usually causes mild respiratory diseases, their frequency might be higher in outpatient children. Mean- while as HRSV is really sensitive to inactivation due to environmental situations and its genome maybe degraded, then for future studies, we need to use fresh samples for HRSV detection. These findings addressed a need for more studies on viral respiratory tract infections to help public health.


2011 ◽  
Vol 49 (7) ◽  
pp. 2620-2624 ◽  
Author(s):  
Susan Bennett ◽  
Heli Harvala ◽  
Jeroen Witteveldt ◽  
E. Carol McWilliam Leitch ◽  
Nigel McLeish ◽  
...  

2019 ◽  
Vol 11 (1) ◽  
pp. e2019059
Author(s):  
Khaldoun Masoud ◽  
Ghassan Matar ◽  
Ghassan Dbaibo ◽  
Geoarge F Araj ◽  
Hasan Zaraket ◽  
...  

 Background: Acute respiratory infections (ARI) are the leading cause of death worldwide especially among children. The majority of these infections in children are of viral etiology. In this study, we evaluated the incidence of viral ARI among children in Lebanon. Methods: Children presenting with symptoms of ARI were prospectively recruited between September 2009 to February 2012. Nasopharyngeal aspirates were obtained from patients and screened for 11 respiratory viruses using a multiplex Luminex-based PCR assay. Results: Two hundred twenty-one patients were recruited with a median age of 1 year (IQR: 0 - 5). Out of 221 patients, 116 (52.5%) were positive for at least one virus, the majority (103/116; 88.8%) of which were in children under 6-year of age. Overall 188 viruses were detected. Rhinovirus (RhV) was the most common virus detected in 81 (69.8%) patients followed by coxsackie virus and echovirus (CVEV) which were detected as one target in the panel in 45 (38.8%), and parainfluenza viruses (PIV types: 1, 2, 3, 4) in 24 (20.7%) patients. Coinfection with more than one virus was detected in 49 (42.9%) patients. RhV and CVEV were the most common viruses associated with co-infections and higher risk of rhinorrhea. Conclusion: Viral pathogens account for at least half of the ARIs in Lebanon, with a high frequency of co-infections being detected.


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