Clinical trial NCT03528759: Streptoccus Pseudopneumoniae atAssiut UniversityHospitals
Official title: Streptococcus Pseudopneumoniae as an Emerging Respiratory Tract Pathogen at Assiut University Hospitals
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Pneumonia
Streptococcus Infection
Lead sponsor: Assiut University
Sponsor class: OTHER
First posted: 2018-05-18
Enrollment: 100
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: OTHER
Time perspective: CROSS_SECTIONAL
Sampling method: PROBABILITY_SAMPLE
Study population: Sputum samples will be collected from all studied patients under complete aseptic condition. sputum specimens will be cultivated on 5% sheep blood agar, chocolate agar (Oxoid, UK.

Brief summary: Streptococcus pseudopneumoniae as suggested by DNA-DNA homology studies is recorded as a species of the Streptococcus mitis/oralis members of viridans group Streptococci; they have some similar features to the Streptococcus mitis/oralis members of viridans Streptococcus pneumoniae

Detailed description: principle characteristics of Streptococcus. pseudopneumoniae are the lacking of pneumococcal capsule, bile insolubility, the indeterminate sensitivity Or resistance to optochin after incubation in Carbon dioxide (5%), while sensitivity to it after incubation in ambient air Streptococcus . pseudopneumoniae was firstly described in sputum samples of patients with lower respiratory tract infection, particularly those with Chronic Obstructive PulmonaryDiseases pseudopneumoniae is usually misidentified in our laboratories as we usually rely on optochin sensitivity testing with 5% Carbon dioxide detection of Streptococcus. pneumoniae and miss the incubation in ambient air which is the key point for identification of Streptococcus. pseudopneumoniae. Biochemical reactions are usually used to differentiate typical pneumoniae from Streptococc Streptococcus . pseudopneumoniae and other related Streptococci; several molecular techniques have also been used There are several polymerase chain reaction based assays that target specific pneumococcal virulence factors for the typical Streptococc Streptococcus . pneumoniae, such as autolysin A which is the major pneumococcal autolysin and the capsular polysaccharide biosynthesis gene A which is a conservedpneumococcal capsular polysaccharide gene , also aliB-like ORF2 (a gene that usually found in the capsular region of non-capsulated pneumococci; these genetic markers have been used to differentiate S. pneumoniae from other related species.

Eligibility criteria: Inclusion Criteria:

* All patients showing signs of respiratory tract infection

Exclusion Criteria:

* No exclusion criteria

Primary outcomes:
measure: identification of Streptococcus. pseudopneumoniae
timeFrame: 1year
Secondary outcomes:
Other outcomes:
Locations:
Study officials:
References:
citation: Raddaoui A, Simoes AS, Baaboura R, Felix S, Achour W, Ben Othman T, Bejaoui M, Sa-Leao R, Ben Hassen A. Serotype Distribution, Antibiotic Resistance and Clonality of Streptococcus pneumoniae Isolated from Immunocompromised Patients in Tunisia. PLoS One. 2015 Oct 13;10(10):e0140390. doi: 10.1371/journal.pone.0140390. eCollection 2015.
citation: Charalambous BM. Identifying divergent streptococcal strains using pherotype: implications for pathogen emergence and epidemiology. Future Microbiol. 2012 Dec;7(12):1349-54. doi: 10.2217/fmb.12.114.
citation: Leung MH, Ling CL, Ciesielczuk H, Lockwood J, Thurston S, Charalambous BM, Gillespie SH. Streptococcus pseudopneumoniae identification by pherotype: a method to assist understanding of a potentially emerging or overlooked pathogen. J Clin Microbiol. 2012 May;50(5):1684-90. doi: 10.1128/JCM.00131-12. Epub 2012 Feb 29.