Microbe Minutes MCB Exam 3

Shigella Flexneri

• rods

• Shigellosis; humans only pathogen in intestinal epithelial cells; treated with beta-lactam antibiotics

• causes dysentery

• facultative anaerobe

• no spore no flagella

• polymerization of actin to spread

Haemophilus influenzae

• Coccobacilli (tiny rods)

• Opportunistic; type b causes bacteremia and meningitis; humans only

• faculative anaerobe

• 7 types based on capsule polysaccharide- capsule and no capsule species

• fastidious grower (needs factor X and V w chocolate agar) can grow at high CO2 level (capnophilic)

Agrobacterium tumefaciens

• Peritrichous flagella

• Plants only; tumor-like growths; Ti plasmid encodes T-pilus gene

• Aerobic

• Rod

• has linear and circular chromosomes + 2 plasmids- chemotaxis- biofilm former

• 28 degrees

Francisella tularensis

• Coccobacilli (tiny rods)

• Tularemia; animals to humans only! skin exposure, inhalation, eyes, ingestion, systematic infection

• Aerobic

• cysteine for growth

Pectobacterium carotovorum

• rod

• Peritrichous flagella

• Plants only; opportunistic; Bacterial Soft Rot breaks down cell wall; via contaminated irrigation

• facultative anaerobe

• 20-25 degrees

• soil dwelling