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5. Streptococcus pneumoniae
Streptococcus pneumoniae is a gram positive, alpha-hemolytic, lancet-shaped diplococcus. It replicates in chains when in liquid medium. It is both bile soluble and optochin sensitive. An initial test of any gram-positive organism is a catalase test which is used to differentiate Staphylococcus aureus which is positive from Streptococcus pneumoniae is negative. Colonies may rarely appear mucoid and have umbilicated appearance.
When should steroids be given in bacterial meningitis? (Click on the correct answer to be directed to the sixth of seven pages)