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Old 03-08-2012
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Bacteria Bacitracin sensitivity

18 month old. lesion near corner of her mouth that weep serous fluid and become crusty overnight. which of the following is the most likely property of the causal organis?

a. alpha hemolysin
b. bacitracin sensitivity
c. CAMP test positive
d. catalase positive
e. coagulase positive

ans: B
why not D? staphylococcus is no.1 cause of impetigo.
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Old 03-08-2012
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Idea!

If D - catalase positive is staphylococcus, Bacitracin sensitivity test is for GAS (Beta hemolytic group A strep).

Hope this helps.
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Old 03-08-2012
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Quote:
Originally Posted by kenlee View Post
18 month old. lesion near corner of her mouth that weep serous fluid and become crusty overnight. which of the following is the most likely property of the causal organis?

a. alpha hemolysin
b. bacitracin sensitivity
c. CAMP test positive
d. catalase positive
e. coagulase positive

ans: B
why not D? staphylococcus is no.1 cause of impetigo.
I think thats because Staph aureus and Strep Pyogenes can both cause skin abscesses. My guess would be that they should have mentione yellow pigment for staph, but they didnt. So go with GAS.pyogenes, which is bacitracin sensitive
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Old 03-09-2012
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If it were Staph aureus, then both D and E would be correct, right? Since they're both options, then it is more likely group A Strep than coagulase-negative Staph?
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Old 03-09-2012
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Originally Posted by Mondoshawan View Post
If it were Staph aureus, then both D and E would be correct, right? Since they're both options, then it is more likely group A Strep than coagulase-negative Staph?
i think it was jst a bad question...
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