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Antibiotic Spectrum of Activity
Only inlcudes the exceptions for ab susceptibility!
13
Veterinary Medicine
Professional
02/20/2012

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Cards

Term
Flouroquinolones don't work on...
Definition
Anaerobes (Gram +/-).
Term
Macrolides don't work on...
Definition
Gram negative organisms (aerobic and anaerobic)
Term
Metronidazole doesn't work on....
Definition
Aerobes (Gram +/-).
Term
Aminoglycosides don't work on...
Definition
Gram positives (all) or Gram negative anaerobes.
Term
Beta-Lactam drugs
Definition
Penicillins, cephalosporins.
Inhibit cell wall synthesis by binding to penicillin binding proteins (PBP).
Resistance by production of beta-lactamases by bacterial cells.
Effective against most bacteria w/o beta-lactamase- broad spectrum.
Term
Tetracyclines
Definition
Inhibit protein synthesis, affects host cell proteins mildly also.
Resistance via plasmids for efflux pumps w/ cross-resistance.
Names ending in -cycline.
Broad spectrum.
Term
Chloramphenicol
Definition
Inhibits protein synthesis.
Plasmid mediated resistance.
Broad spectrum efficacy.
Term
Aminoglycosides
Definition
Inhibit protein synthesis.
REQUIRE O2-DEPENDENT ACTIVE TRANSPORT- no effect on anaerobes!
Incomplete cross resistance due to plasmid mediated enzymes (specific for different drugs in the class).
Term
Macrolides
Definition
Inhibit protein synthesis.
Drugs ending in -mycin.
Not active against gram negatives.
Term
Lincosamides
Definition
Inhibit protein synthesis.
Also ending in -mycin (clindamycin in vet med).
Effective for Mycoplasma, Gram + aerobes and anaerobes.
Term
Fluorquinolones
Definition
Target DNA recoiling by disabling topoisomerases.
Don't work for anaerobes.
Resistance by new plasmid, DNA enzyme changes, or conjugation.
Names of drugs with -floxacin.
Term
Sulfonamides
Definition
Block step in folic acid pathway.
With trimethoprim/ormetoprim- bacteriocidal by blocking a 2nd step.
Cross resistance by plasmid with new enzyme or producing more enzyme.
Term
Metronidazole
Definition
Bacteriocidal against obligate anaerobes.
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