Yersinia Flashcards
False about Yersinia A. All are strictly anearobic B. 1 serotype, 3 biotypes C. Catalase positive D. (-) in motility, oxidase, lactose, urease, indole
A
Some are aerobic
Some are faculatively anaerobic
Some are microaerophilic
The plague is caused by this Yersinia species
Yersinia pestis
Yersinia outer proteins enter cells via __
Type III secretion system
What is pseudotuberculosis?
Disease characterized by lesions ranging from local necrosis to granulomatous inflammation in the lymph nodes, spleen and liver
Scientific name of flea that transmits Yersinia @ Asia, Africa, South America
Xenopsylla cheopis
Scientific name of flea that transmits Yersinia @ US
Oropsylla montana
Primary reservoir of Yersinia @ sylvatic plague
Wild rodents
In Bubonic Plague, one need not look far to see a bubo. What is a bubo?
Swollen & painful lymph node
In the victims of the Black Death, subcutaneous hemorrhages that darken the skin were seen. Why?
Purpuric lesiobs & microthrombi (formed from necrosis of extremities) block the capillaries
Best specimen for diagnosing Plague
Blood & aspirates of lymph nodes
Two smears used to identify Yersinia
Giemsa’s stain
Wayson’s stain
Drug of choice for plague treatment
A. Streptomycin
B. Penicillin
C. Cephalosporin
A
Colony of growth of Yersinia on BAP
Fried egg appearance
In cats, Yersinia may seroconvert. True or false?
False.
True for dogs
Aminoglycosides & tetracyclines are used to treat infection in animals. True or false?
True
False about Y.enterocolitica / Y.pseudotuberculosis
A)lactose-fermenting
B)non-motile at 37 deg C
C)motile at 25 deg C
D)larger than Y.pestis
A
Y.enterocolitica may be isolated from all except A. Rodents B. Domestic animals C. Contaminated water D. Feces
D
Y.pseudotuberculosis is isolated from what specimen?
Feces of domestic/farm animals & birds
True about Yersinia enterocolitica A. May cause diarrhea and mesenteric adenitis B. With heat stable exotoxin C. 5-10 days incubation D. Has serotypes O3,O8 and O9
B
Enterotoxin dapat
Enumerate the virulence factors of Y.pseudotuberculosis
Superantigens
Bacterial adhesions
Yersinia outer proteins
Cold enrichment helps in lab ID of A. Y.enterocolitica B. Y.pseudotuberculosis C. Both D. Neither
A
