Ch. 25 - Listeria & Erysipelothrix

Question 1

Listeria & Erysipelothrix

Answer 1

G+b
Aerobic
Non-spore forming

Question 2

L. monocytogenes

Answer 2

G+b
CAT + (unlike Gp. B Strep)
CAMP +
Weak beta-hem
Facultative (salt)
Intracellular (avoid humoral; need T-cell)

Tumbling motility

Food and water contaminant (dairy, meat, poultry, raw veggies)

Exotoxin listeriolysin O (bacterial spread)

Question 3

Listeria monocytogenes diseases

Answer 3

Passes thru GI lining to liver and spleen –> disseminated disease

Neonatal: early onset (in utero) - abortion, stillbirth, premie
late onset (2-3 weeks) - meningitis 

Adult: Flu-like (also in pregnant women)
Meningitis
Bacteremia

Question 4

Erysipelothrix rhusiopathiae

Answer 4

G+b 
Non-spore forming
Microaerophilic & CO2
NaCl tolerant
Alpha-hem

Zoonotic

Capsule
Neuramidase - attachment and penetration of epithelial cells

Question 5

Erysipelothrix rhusiopathiae diagnosis

Answer 5

CAT - and MOT - (unlike Listeria)

H2S +

Question 6

Erysipelothrix rhusiopathiae disease

Answer 6

Erysipeloid - voilet, pruritic, inflammatory lesion on finger & hands. Pus uncommon (unlike Strep)

Septicemic disease (rare; associated with endocarditis)