In a phenomenon known as satelliting, tiny colonies of Haemophilus spp. may be observed growing on sheep blood agar close to colonies of:
a. Streptococcus pyogenes.
b. Staphylococcus aureus.
c. Micrococcus spp.
d. other Haemophilus spp.
B
Five percent sheep blood agar contains hemin but not NAD. Several bacterial species, including S. aureus, produce NAD as a metabolic byproduct. Therefore, tiny colonies of Haemophilus spp. may be observed growing on sheep blood agar close to colonies of bacteria that can produce V factor. This phenomenon is known as satelliting.
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