scholarly journals Detection of Haemophilus influenzae and Streptococcus pneumoniae DNA in blood culture by a single PCR assay.

1996 ◽  
Vol 34 (8) ◽  
pp. 2030-2032 ◽  
Author(s):  
M Hassan-King ◽  
I Baldeh ◽  
R Adegbola ◽  
C Omosigho ◽  
S O Usen ◽  
...  
Author(s):  
Aparna Sonowal ◽  
Partha Pratim Das ◽  
Mithu Medhi ◽  
Aditi Baruah ◽  
Ezaz Hussain

Introduction: Pneumonia is the single largest infectious cause of death in children worldwide. Aetiology of pneumonia can be identified using multiple diagnostic tools including culture, serology and Polymerase Chain Reaction (PCR); common pathogens include Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus, some atypical bacteria like Mycoplasma pneumoniae and Chlamydophila pneumoniae. Aim: To find out the bacteriological agents causing Community Acquired Pneumonia (CAP) in under five year children and to compare the conventional culture and PCR in identifying the pathogen. Materials and Methods: This cross-sectional study was undertaken in the Department of Microbiology and Department of Paediatrics in a tertiary care centre of Assam, India, between March 2016 to September 2018. The study was undertaken with 200 under five year old children who were clinically diagnosed as CAP. Oropharyngeal (OP) swabs and blood culture were processed for bacteriological culture. PCR assay of OP swabs for Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus etc., including atypical bacteria like Mycoplasma pneumoniae and Chlamydophila pneumoniae were performed. Data entry, database management and statistical analysis were performed using Epi-Info software version 7.0. Results: A total of 200 subjects were included in the present study with a male:female ratio of 1.63:1. Most of the study subjects were <11 months of age. Most common isolates were Streptococcus pneumoniae (26.5%) and Staphylococcus aureus (25%) from OP swabs; blood culture revealed mostly Staphylococcus aureus (59%) and Streptococcus pneumoniae (25%). PCR assay of OP swabs were found positive mostly for Staphylococcus aureus (47%), Streptococcus pneumoniae (21.5%) while two children were positive for Haemophilus influenzae; Bordetella pertussis was detected in one child. On evaluation, PCR assay in detecting the bacterial pathogen was found statistically more significant than conventional culture of OP swabs (p<0.05). Conclusion: Staphylococcus aureus and Streptococcus pneumoniae were the most common bacterial organisms in the study. PCR assay was found to be more useful in diagnosing the pathogen for bacterial pneumonia including those difficult to grow in conventional culture.


PEDIATRICS ◽  
1991 ◽  
Vol 87 (1) ◽  
pp. 48-53 ◽  
Author(s):  
Sara A. Schutzman ◽  
Stephen Petrycki ◽  
Gary R. Fleisher

To investigate the occurrence and outcome of bacteremia associated with otitis media, charts were reviewed from patients who were 3 to 36 months of age, had temperatures ≥39°C, and were diagnosed with isolated clinical otitis media. A total of 2982 patients were identified. Blood cultures were obtained from 1666 (56%). Of the 1666 patients, who had blood drawn for cultures, 50 (3.0%) had bacteremia. These included 39 with Streptococcus pneumoniae, 4 with Haemophilus influenzae, 2 with Neisseria meningitidis, 3 with Salmonella species, and 2 with Staphylococcus aureus. The incidence of bacteremia increased at higher temperatures, being 1.9% at temperatures ≤40°C and 5.0% at temperatures &gt;40°C. Younger children were more likely to have bacteremia; 3.7% ≤12 months of age, 2.4% 13 to 24 months of age, and 1.9% 25 to 36 months of age had blood culture results that were positive (not significant). Reevaluation of the 50 bacteremic patients showed that 9 patients had continued fever, 3 patients had persistent bacteremia, pneumonia developed in 1 patient, and meningitis developed in 1 patient. It was concluded that (1) 3% of young febrile children with otitis media have bacteremia at the time of evaluation, a rate comparable to that previously reported in children with no focus of infection; (2) the incidence of bacteremia increases at higher temperatures; and (3) most febrile children with otitis media do well. The clinician must therefore weigh the potential benefit of drawing a blood culture to identify children at risk for complications against the inherent cost, inconvenience, and discomfort.


2017 ◽  
Vol 11 (2) ◽  
pp. 9-16
Author(s):  
Nilufar Yeasmin Nili

The present study was done to evaluate a multiplex PCR based method for simultaneous detection of Neisseria meningitidis, Streptococcus pneumoniae and Haemophilus influenzae in CSF. A cross sectional study was carried out with 140 children (2 months to 12 years of age) with clinical suspicion of acute meningitis during July 2010 to June 2011. Three species-specific primers were used along with universal primers of bacterial gene 16S rRNA, in a two-stage PCR assay for diagnosis of acute bacterial meningitis.Among 140 patients, 42 (30%) cases were diagnosed as bacterial meningitis and other 98 (70%) as viral meningitis by clinical and cytobiochemical criteria. Out of 42 bacterial meningitis cases, 9 (21.43%) were positive by Gram stain.These 9 cases were also positive by bacterial culture and PCR. Again, 15 (35.71%) were positive by bacterial culture which were also PCR positive. In 27 cases (out of 42), the etiologic diagnosis was not possible using routine bacteriological methods; in 11 of these patients, the etiologic agents were identified by PCR. In addition, PCR recognized 5 more cases whose etiologic diagnosis was not possible, as they were identified by universal primer of 16S rRNA. Hence, among 31 (73.81%) PCR positive cases, 12 (38.71%) were S. pneumoniae, 10 (32.26%) were H. influenzae, 4 (12.9%) were N. meningitidis and 5 (16.13%) were other bacteria.Among the antibiotic users, bacterial meningitis case detection by PCR was higher (65.52%) than that of culture (10.34%) and Gram staining (6.90%). The overall sensitivity and specificity of PCR assay was 100% and 66% respectively when bacterial culture was considered as gold standard. PCR can be used as a valuable supplementary diagnostic technique in routine clinical practice for diagnosis of acute bacterial meningitis in hospital setting. Bangladesh J Med Microbiol 2017; 11 (2): 9-16


1998 ◽  
Vol 26 (149) ◽  
pp. 34 ◽  
Author(s):  
Mª Amparo Morant Gimeno ◽  
J. Díez Domingo ◽  
C. Gimeno ◽  
N. de la Muela ◽  
I. Pereiró ◽  
...  

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