373233 susceptibili#1fb980.indd

GRAM-POSITIVE
GRAM-NEGATIVE
Auckland 2009
Antibiotic Susceptibility Testing
Percentage Susceptible
MSSA (16,953)
MRSA (1,839) (9.8% of
[all urinary isolates] (1,282)
(Gp A Strep) (4,281)
(Gp B Strep) (678)
[99% urinary isolates] (1,849)
[96% urinary isolates] (15,363)
[86% urinary] (1,887)
[88% urinary isolates] (1,041)
[53% urinary isolates] (678
[28% urinary isolates] (241)
[76% urinary isolates] (282)
[64% urinary isolates] (159)
[26% urinary isolates] (1,105)
[19% urinary isolates] (142)
EAR/ RESPIRATORY TRACT INFECTIONS
Acute Exacerbations of Chronic Bronchitis Respiratory viruses, e.g. Influenza Mycoplasma, Chlamydophila• H.influenzae Community-acquired Pneumonia S.pneumoniae not tested: the antibiotic is not usually appropriate treatment for this bacterium URINARY TRACT INFECTION
S. pneumoniae susceptible to penicillin can be considered susceptible to ampicillin, amoxycillin, amoxycillin/ b) No official interpretive criteria exist for testing S. pyogenes susceptibility to cotrimoxazole and tetracycline. clavulanate, cefaclor, and cefuroxime: these agents are not tested routinely against penicillin susceptible strains. Cotrimoxazole and tetracycline are not appropriate treatments for streptococcal pharyngitis.
Penicillin non-susceptible S. pneumoniae are less susceptible to all ß-lactam antibiotics, but this relative resistance c) For staphylococcal susceptibility testing, erythromycin is a surrogate for clindamycin. Erythromycin resistant is of little significance in the case of amoxycillin which, in standard or high oral doses, is still likely to be effective strains are commonly resistant to clindamycin. Erythromycin susceptible isolates are rarely clindamycin in treating most pneumococcal infections other than meningitis. The same is true for parenteral cefuroxime and parenteral penicillin itself. Cefaclor is less active than these agents against S. pneumoniae, and although effective d) Enterococcus spp.: cephalosporins, gentamicin and cotrimoxazole may appear active in vitro but are not against penicillin susceptible strains, is not recommended for treatment of infection due to penicillin non- susceptible strains. Isolates with reduced susceptibility to penicillin are also commonly resistant to erythromycin, There are no established breakpoints for testing H. influenzae against erythromycin (or roxithromycin) by the SKIN AND SOFT TISSUE
cotrimoxazole and tetracycline. Amoxycillin remains the oral treatment of choice for most infections due to disc method. Most isolates of H. influenzae are only moderately susceptible to these antibiotics and it may be S. pneumoniae despite relative resistance in vitro. Note: clavulanate adds nothing to the activity of amoxycillin No official interpretive criteria exist for testing S. agalactiae susceptibility to nitrofurantoin.

Source: http://www.dml.co.nz/media/84206/antibiotic%20susceptibility%20chart.2010.pdf

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