A small gram negative coccobacillus grows only near colonies of Staphylococcus aureus on blood agar. Which organism is most likely?
1Neisseria meningitidis
2Haemophilus influenzae✓ 정답
3Bordetella pertussis
4Moraxella catarrhalis
해설
This is satellitism. Staphylococcus aureus lyses red cells and supplies the growth factors the organism requires, so growth occurs only near those colonies. Haemophilus influenzae requires both X factor and V factor.