Page 1 of 2: q. micro

drche · Credits: 11979 My Scrapbook My Reading List 10 Books

A newborn in the neonatal intensive care unit becomes tachypneic and irritable. Blood cultures grow a gram-positive coccus in chains that is presumed to be a streptococcus. Which of the following characteristics would help to differentiate Streptococcus agalactiae from Streptococcus pneumoniae?
A. Alpha-hemolysis
B. Carbohydrate capsule
C. Cytochrome enzyme system
D. Growth in bile
E. Oxacillin sensitivity

manpreet108 · Credits: 30702 My Scrapbook

i think a,b ,d are correct.

strepto agalactiae--
shows beta hemolysis,no capsule,growth in bile.

stepto pneumoniae-
shows-alpha hemolysis,polysacharide [carbohydrate] capsule, and bile solubility[no growth in bile]

srushti · Credits: 462 My Scrapbook

yes i a;lso think the same!

sravya · Credits: 28740 My Scrapbook

hey multiple answers , sounds controversial wats the answer sree?

keep smilin............

gudluck!

b'bye!

ratnakar_potla · Credits: 5713 My Scrapbook My Reading List 2 Books

so whats the answer?

drche · Credits: 11979 My Scrapbook My Reading List 10 Books

The correct answer is A. Streptococci are usually initially speciated by their hemolytic capacity on sheep blood agar. Beta-hemolytic streptococci include groups A, B, and D. S. agalactiae is the classic group B streptococcus. The non beta-hemolytic streptococci consist principally of the pneumococci and the viridans group.

Both S. agalactiae and pneumococcus have a carbohydrate capsule , an important virulence factor and means of subtyping streptococcal species.

None of the streptococci utilize cytochrome enzymes . They derive all of their energy from the fermentation of sugars to lactic acid.

Neither pneumococcus nor S. agalactiae can grow in bile . This ability is specific for the enterococcus group (group D) of streptococci.

Both pneumococci and S. agalactiae are usually treated with penicillin-type antibiotics, although group B streptococci require a penicillinase-resistant type such as oxacillin.

cudos, che..

ratnakar_potla · Credits: 5713 My Scrapbook My Reading List 2 Books

okk thanks for that

sprite · Credits: 762 My Scrapbook

good q....thank u

samip · Credits: 664 My Scrapbook

gud q...thanx

manpreet108 · Credits: 30702 My Scrapbook

cooool....

thanks for this.

came acroos these few interesting facts while looking for this--

1.strepto pyogenes also has a polysacharide capsule --imp for pathogenesis.

2.growth in bile and saline is imp pathogenic factor that helps enterococus to grow inbowel and gall bladder.

3.typing for beta hemolytic streptococcus is on basis of--cell wall carbohydrate

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