Gram Positive Cocci
Which of the following is not true about Streptococcus pneumoniae? (AIPG 2011)
|A||Its capsule aids in infectivity.|
|B||It is commonest cause of otitis media and pneumoniA.|
|C||It is least likely cause of meningitis.|
|D||It is bile soluble|
It is least likely cause of meningitis.
a. Streptococcus pneumonia is commonest cause of Meningitis in adults.Q
b. S.pnemoniae is gram positive cocci in pairs, capsulated, optochin sensitive, bile soluble and inulin fermentation test positive.Q
c. OPTOCHIN TEST: The optochin test is a presumptive test that is used to identify strains of Streptococcus pneumoniae. Optochin (ethyl hydrocupreine) disks are placed on inoculated blood agar plates. Because S. pneumoniae is optochin sensitive, a zone of inhibition will develop around the disk where the bacteria have been lysed. This zone is typically 14mm from the disk or greater.