Agar

This list will be expanded continously.

Blood Agar
- Gram positive and Gram negative grow here.

Chocolate agar
- Quite similar to blood agar. Yet, red blood cells are destroyed and this agar allows gram positive and gram negative bacteria.

Mannitol Salt Agar
- Staphylococci can grow here and give yellow pigment.

New York Agar
- Neisseria gonnorhea grows here.

McConkey agar
- mainly to grow gram negative bacteria
- lactose fermenter (i.e. Klebsiella) will change the colour here; non-fermenter (i.e. Salmonella) will grow with the same colour.

Sorbitol McConkey (SMAC) agar
- addition of sorbitol in the agar.
- to differentiate E. coli O157:H7 from other E. coli.
- unlike other E. coli, O157:H7 does not ferment sorbitol but peptone and change the pH on the agar.

Haemophilus agar
- like blood agar, but with factor V and X that allow growth of Hemophillus.
- Haemophillus do not grow on agar where blood is in there.

Kligler agar
- on a tube
- can detect H2S production.
- all Salmonella produces gas, except typhi.

Lowenstein agar
- Mycobacterium grow on this agar.
- Mycabacterium tuberculosis will be rough, unpigmented and sticks really well with this agar; other mycobacterium will be pigmented (see also item on Mycobacterium).

CLED agar
- Cysteine Lactose Electrolyte Deficient.
- For differentiation urine microorganims.
- Lactose fermenters: yellow, non fermenters: blue.

Granada agar
- Selective and differential medium for group B streptococcus (GBS)
isolation.
- GBS will be orange (figure).

Muller Hinton agar
- to perform antibiotic susceptibility test.
- one colony is put into salt solution and inoculated on this agar.
- antibiotic is read 24 hours after platting on this agar.
- on this agar, Pseudomonas is quite green (due to fluorescens (?). Pseudomonas also make biliveridin, which is red).