BSC 431 Lecture Notes - Lecture 22: Peptidoglycan, Mycobacterium, Penicillin

• School: University of Alabama
• Department: Biological Sciences
• Course: BSC 431
• Professor: Julie Olson

Document Summary

Decaying vegetable matter is a prime source. Asymptomatic carriers: persons in contact w/ domestic animals. A major reason for several recent recalls of prepared meats and cheeses, cantaloupes, and ice cream products. Refrigerated soft cheeses, deli meats, hot dogs, milk, raw vegetables (especially cabbage) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) Can replicate at low temperatures (ie refrigeration temps) Colonies small, resemble strep w/ weak beta hemolysis on blood agar. Genus listeria consists of 10 species; only 2 are recognized pathogens (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1: listeria monocytogenes: 1 human pathogen. A facultative intracellular parasite of macrophages and epithelial cells: listeria ivanovii: animal pathogen, rare human infections. Other species can be found as normal flora. Usually affects high-risk populations: neonates, elderly, pregnant women, and immunocompromised patients (cid:1) Early onset: acquired transplacentally, high mortality, rare, disseminated abscesses and granulomas in multiple organs, can result in abortion or stillbirth.