Indan Journal of Medical Research Indan Journal of Medical Research Indan Journal of Medical Research Indan Journal of Medical Research
  Home About us Editorial board Search Ahead of print Current issue Archives Submit article Instructions Subscribe Contacts Login  
  Home Print this page Email this page Small font sizeDefault font sizeIncrease font size Users Online: 659       
Year : 2012  |  Volume : 136  |  Issue : 5  |  Page : 877-880

Streptococcus pseudopneumoniae: An emerging respiratory tract pathogen

1 M.B.B.S. third year student, Kasturba Medical College, Manipal University, Mangalore, India
2 Department of Microbiology, Kasturba Medical College, Manipal University, Mangalore, India

Correspondence Address:
B Dhanashree
Associate Professor, Department of Microbiology, Kasturba Medical College, Manipal University, Mangalore 575 001
Login to access the Email id

Source of Support: None, Conflict of Interest: None

PMID: 23287138

Rights and PermissionsRights and Permissions

Background & objectives: Streptococcus pseudopneumoniae a member of the Viridans Streptococci, is known to be associated with chronic obstructive pulmonary disease and respiratory tract infections (RTI). Very scanty information is available on the isolation of S. pseudopneumoniae from India. Hence, the present study was an attempt to isolate S. pseudopneumoniae from clinical samples and to study their drug resistance pattern. Methods: Sputum samples (n=150) submitted to the microbiology laboratory for routine culture from patients clinically suspected to have lower respiratory tract infection were inoculated onto sheep blood agar and chocolate agar plates. Alpha haemolytic colonies were identified as S. pseudopneumoniae based on absence of capsule, bile solubility and optochin susceptibility in 5 per cent CO 2 and ambient air. Disk diffusion method was used for antibiotic susceptibilily testing. Results: Among the samples screened, 4 per cent showed the growth of only S. pseudopneumoniae. Other pathogens isolated were Streptococcus pneumoniae, Moraxella catarrhalis, Klebsiella spp., Enterococcus spp., Pseudomonas spp., Haemophilus influenzae, Staphylococcus aureus, Candida albicans. All the S. pseudopneumoniae isolates were resistant to erythromycin. Interpretation & conclusions: Our preliminary results showed presence of S. pseudopneumoniae in this part of the country and these were associated with RTI. Currently, most clinical laboratories report optochin susceptible isolates in 5 per cent CO 2 as S. pneumoniae and the resistant ones are not further tested for susceptibility in ambient air. As a result, S. pseudopneumoniae may be missed out. Hence, performance of at least two tests, viz. optochin susceptibility with incubation in 5 per cent CO 2 and ambient air along with bile solubility is necessary to differentiate S. pneumoniae from S. pseudopneumoniae.

Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded464    
    Comments [Add]    

Recommend this journal