MAC
BEA
Entero will grow in BEA
catalase
staph are catalase positive
coagulase/MSA
aureus is coagulase positive
aureus will produce yellow colonies on MSA
non-pathogenic staph will appear pink/red
BAP
s. pneumoniae = α = green
group A strep + s. pyogenes = β = clear colony border
group D strep + s. viridians = γ = no effect
bacitracin
s. pyogenes will be inhibited by bacitracin
optochin sensitivity
s pneumoniae will be inhibited
MacConkey's Agar
pseudomonas + salmonella = non-lactose fermenting = clear/beige
E. coli = lactose fermenting = pink
TSA
pseudomonas will be blue