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Bacteriology Exam 1 Questions well answered to pass
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Bacteriology Exam 1 Questions well answered to pass
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Bacteriology Exam 1 Questions wellanswered to pass
Best Media for E. Coli? - correct answer ✔✔EMB
In the Family of Enterobacteriaceae, are there spore forming bacteria? - correct answer ✔✔Non-spore
forming
Name the characteristics of E. Coli. - correct answer ✔✔-Gram -
-short rods
-capsule is often present
-mucoid
-lactose fermentor
Name the 4 diseases caused by E. Coli. - correct answer ✔✔-Enterotoxic: Enteric Colibacillosis-
enterotoxin produced, but not absorbed. Causes diarrhea. Enters in S.I.
-Enterotoxemic Colibacillosis: Toxin is absorbed, action of toxin elsewhere. Enters in S.I.
-Local Invasive Colibacillosis: destroys ep. cells locally in the intestines, but does not travel systemically
-Septicemic Colibacillosis: Endotoxin damage to the host. Can be resp tract or intestinal tract entrance.
Survive and multiply in the blood and tissues. Can cause fibrinopurulent lesions.
How do Enterotoxins work? - correct answer ✔✔-activates adenylate cyclase
-a.c. increases cAMP
-increased cAMP causes hypersecretion of water and chlorides into the gut
-diarrhea
Name the two diseases caused by E. Coli in Cattle - correct answer ✔✔-Septicemic
Colibacillosis/Colisepticemia: 4-5 day old calves, overwhelming to the system.
,-Enteric Colibacillosis-calves under 2 weeks (but up to a month). Enterotoxin working here making main
symptom diarrhea for several days.
What Bacteria is found in 70% of pyometras in bitches and is also a commonly isolated pathogen in the
urinary tract of dogs and cats? - correct answer ✔✔E. Coli
Piglet Scours is another name for what? - correct answer ✔✔Neonatal Colibacillosis in pigs 1-12 days of
age. 70% mortality rate. Caused by K88 strain. Differentials are TSE, Starvation, Clostridium Perfringens
What is another name for Post-Weaning Colibacillosis/E. Coli Enterotoxemia? - correct answer ✔✔-
Edema Disease
-This is highly fatal neurological disorder caused by the toxin from E. Coli
-Has K88 pili antigens.
-Produce Hemolysin toxin which causes arterial degeneration and increase vascular permeability.
Can you give antibiotics empirically for the control of E. Coli? - correct answer ✔✔No, you must do a C&S
to determine if the drug is able to work for the strain you are dealing with.
What part of the E. Coli bacteria is used for the vax? - correct answer ✔✔The K88 pili
In Sows, given to them so that they can help build immunity through colostrum in the piglets.
What are the 3 types of E. Coli in Poultry - correct answer ✔✔-neonatal colisepticaemia
-respiratory colisepticaemia
-enteric colisepticaemia
Explain the process of respiratory colisepticaemia in Poultry - correct answer ✔✔Causes tracheitis,
bronchitits, pneumonia, air sacculitis, pericarditis and peritonitis. Often caused due to birds in an
atmosphere that is not well ventilated. Urine allows bacteria in environment to produce ammonia
products. These dry and become airborne dust. This ammonia is very harmful to cilia in trachea. Cilia
becomes destroyed/irritated, allowing entry of pathogens into the system, increase mucous production,
etc.
, In poultry is enteric colispticaemia usually a disease that develops alone? - correct answer ✔✔No, it is
usually a sequela to something that has damaged the lining of the digestive tract.
What is the strain of E. Coli that is found most in human foodborne illness cases? - correct answer
✔✔0157:H7
What does the 0157:H7 strain of E. Coli cause in Humans? - correct answer ✔✔-92% of humans recover
with simply having bloody diarrhea
-8% go on to develop hemolytic uremia syndrome
-2% of those die
-Thrombocytic Thrombocytopenic Purpura also can occure
What does the 0157:H7 strain of E. Coli do in animals? - correct answer ✔✔Usually not seen as an
animal health pathogen
What can Citrobacter be mistaken for? - correct answer ✔✔Salmonella
-Citrobacter is a lactose fermenter, unlike Salmonella, but it is a delayed fermenter, which can be a
reason for the confusion
How can you recognize Proteus species? - correct answer ✔✔-Concentric ring formation on media
growths.
-Motile
-Lactose non-Fermenter
-Also often confused to be Salmonella
What type of infection do Proteus species usually cause in animals? - correct answer ✔✔Urinary tract
infections in dogs and cats.
not an enteric pathogen in animals.
What species does Shigella affect? - correct answer ✔✔Humans and non-human primates only. Very
deadly.
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