Antimicrobial Drugs Lab

Part 1: Susceptibility Bench

1. Organism (patient isolate)

2. Drug disks (pick up to 6)

Teaching chart: zone diameter (mm)

Zone size cut-offs for each drug
Drug	R	I	S

Results

Your results
Drug	Reading	Call

Challenges

Teaching values, simplified. Real labs use the current published standards for each organism group.

Part 2: Resistance Simulator

Susceptible cells Resistant mutants Drug level Selection window

A teaching model of one infection, about a billion bacteria to start. The graph is a log scale: each line is ten times more cells. Doses are given twice a day. A missed dose is drawn as an open circle.

Drug strength at the infection

Doses taken

Length of treatment

Start with some resistant mutants
Weak immune system

Simulator readouts
Measure	Value

Challenges

Simplified model with rounded numbers. It shows the ideas, not real drug levels; always follow the prescriber.

Antimicrobial Drugs Lab

Part 1: Susceptibility Bench

Read the plate

Read the tray

Part 2: Resistance Simulator

Part 3: Which Drug and Why?

Part 4: Sort It Out