Antimicrobial susceptibility testing

Question 1

Give an example of bacteria that are: predictably susceptible, intrisincally resistant, inducibly resistant and heterozygously resistant

Answer 1

Predictably susceptible: Beta haemolytic strep to penicillin
Intrinsically resistant: Gram negatives and vancomycin
Inducible resistance: Citrobacter to beta-lactams
Heterozygous resistance: MRSA to oxicillin

Question 2

What is the purpose of nitrocephin disk tests?

Answer 2

To check for beta lactamase production