Bacterial taxonomy and classification — Flashcards

Flashcard 1: What is the diagnostic test of choice for Neisseria gonorrhoeae and Chlamydia trachomatis?_____

Answer: Nucleic acid amplification test (NAAT)

Flashcard 2: Why doesn't Rickettsia spp. gram stain well?_____

Answer: Obligate Intracellular bacteria

Flashcard 3: Staphylococcus saprophyticus is catalase _____

Answer: positive

Flashcard 4: Listeria monocytogenes is _____-hemolytic

Answer: beta

Flashcard 5: Which bacteria has characteristic "actin rockets" for intracellular movement?_____

Answer: Listeria monocytogenes

Flashcard 6: Which bacterium has no cell wall?_____

Answer: Mycoplasma pneumoniae

Flashcard 7: Rocky Mountain spotted fever

Answer: Rickettsia rickettsii

Extra: Clinical features: Headache, fever, and rash beginning on wrists and ankles, progressing to trunk, palms, and soles. Treatment: Doxycycline

Flashcard 8: epidemic typhus

Answer: Rickettsia prowazeckii

Extra: rash that begins centrally and spreads but spares palms and solesdoxycycline

Flashcard 9: Ehrlichiosis (Causative agent)

Answer: Ehrlichia chaffeensis

Extra: Monocytes with morula (berry-like) inclusions. Note: Human Monocytic Ehrlichiosis (HME) is caused by E. chaffeensis, while Human Granulocytic Anaplasmosis (HGA) is caused by Anaplasma phagocytophilum.

Flashcard 10: What is the causative agent of Human Granulocytic Anaplasmosis?

Answer: Anaplasma phagocytophilum (carried by Ixodes tick) :: causative agent

Extra: Characteristic finding: Granulocytes with morulae (mulberry-like cytoplasmic inclusions). Note: Human Monocytic Ehrlichiosis (HME) shows morulae in monocytes.