Bacteria — Flashcards

Flashcard 741: Which gram-variable bacteria has a fishy odor?_____

Answer: Gardnerella vaginalis

Flashcard 742: What bacteria releases a toxin that cleaves SNARE proteins in Renshaw cells? _____

Answer: Clostridium tetani

Flashcard 743: _____ is normal flora of the skin and thus can contaminate blood cultures.

Answer: Staph epidermidis

Flashcard 744: Which form of E. coli presents with dysentery (bloody, mucousy diarrhea)?

Answer: Enteroinvasive E. coli (EIEC)

Extra: EIEC invades the intestinal mucosa (clinically similar to Shigella), leading to inflammation and necrosis. This presents as dysentery (fever, abdominal cramps, and blood/mucus in the stool). In contrast, Enterohemorrhagic E. coli (EHEC) causes hemorrhagic colitis (bloody diarrhea) via Shiga-like toxin but does not invade the mucosa, so it typically lacks fever and mucus/leukocytes in the stool.

Flashcard 745: During the _____ phase of bacterial growth, there is no increase in number of cells since you added them to the culture

Answer: lag

Flashcard 746: What is the etiology of Relapsing Fever?_____

Answer: Borrelia recurrentis

Flashcard 747: Clostridium perfringens binds _____, resulting in watery diarrhea due to destruction of tight junctions

Answer: claudins

Flashcard 748: What proteins cross-link peptidoglycan on bacterial cell walls?_____

Answer: Penicillin binding protein transpeptidases (PBPs)

Flashcard 749: Shigella spp. uses host cell _____ to spread from cell to cell

Answer: actin filaments

Flashcard 750: The reservoir for Salmonella _____ is chicken

Answer: enteritidis