Week 6 – Review Sheet
Exercise 1 – Disinfectants
What does bactericidal mean? Bacteriostatic? Virucidal? Fungistatic?
Why are control cultures necessary in evaluating disinfectants?
What factors can influence the activity of a disinfectant?
Why do microorganisms differ in their response to disinfectants?
What microorganisms are most susceptible to disinfectants?
Exercise 2 – Antimicrobial Agent Susceptibility Testing and Resistance
What is meant by antimicrobial resistance? Susceptibility?
Why are pure cultures used for antimicrobial susceptibility testing?
Would it be acceptable to use a mixed culture for this test? Why?
List three factors that can influence the accuracy of the test.
When performing a broth dilution test, why is it necessary to include a growth control tube? A sterility
control tube?
