Miscellaneous/Fastidious Organisms

These flashcards cover the key characteristics of various fastidious organisms as discussed in the lecture notes.

Moraxella catarrhalis

Gram negative diplococci with gray to white colonies on BAP and CHOC, smooth opaque ‘hockey puck’ morphology.

Neisseria gonorrhoeae

Gram negative diplococci with a kidney bean-like appearance, requiring enriched media for growth.

Haemophilus influenzae

Tiny Gram negative bacilli/coccobacilli with tan colonies on CHOC, smelly with mousy and bleach-like odor.

Pseudomonas aeruginosa

Gram negative bacilli known for beta hemolytic colonies on BAP and producing pyoverdin and pyocyanin pigments.

Acinetobacter species

Gram negative bacilli with coccoid and pleomorphic forms, exhibits purple hue on MAC.

Stenotrophomonas maltophilia

Gram negative rod that displays a blue hue on MAC.

Alcaligenes faecalis

Gram negative rods with flagella, showing white, feathery colonies on BAP with alpha-hemolysis.