macConkey agar 4-4

califorms

shows if fecal contamination is present

what is the purpose of the macConkey agar test

used to isolate and differentiate members of the enterobacteriaceae based on the ability to ferment lactose

HE agar

differentiates salmonella and shigella

salmonella

good growth colorless, gram- non lactose fermentor

enterobacter

good growth pink gram- lactose fermentor

e.coli results

good growth, pink, gram- lactose fermentor

what are EMB and macConkey agar selective for

gram negative organisms and contain indicators to differentiate lactose fermentors from lactose non fermentors

true

maconkey agar is a selective and differential medium containing lactose, bile salts, neutral red and crystal violet true or false

s. aureus

no growth gram positive

s. epidermis

no growth gram positive

color of medium

nonlactose fermentors negative color result

lactose fermentors postive color result

red