STREPTOCOCCUS. 411 , Lab 5 Amany Niazy. Streptococci. + ve. - ve. All are Gram Positive Cocci arranged in chains (short or long) All are Catalase - ve. Gram Stain. Staphylococci. streptococci. Culture. Fastidious organism no growth on NA Grows well on BAP
411 , Lab 5
All are Gram Positive Cocci arranged in chains (short or long)
All are Catalase -ve
Fastidious organism no growth on NA
Grows well on BAP
Grow at 37C need 24 to 48 hour .
Lancefield grouping according to antigens in their cell wall
Flattened with raised edges
Always don on a BAP.
On the primary culture of isolation plate before incubation
Zone of inhibition of 14 mm or more sensitive S. pneumoniae
No zone of inhibition S.viridans
Rapid latex and coagglutination tests are available to detect capsular pneumococcal antigen in CSF or other sterile body fluids.