Bacteriology Exam 1 Questions with
100% Correct Answers | Rated A+
Best Media for E. Coli? - ✔✔EMB
In the Family of Enterobacteriaceae, are there spore forming bacteria? -
✔✔Non-spore forming
Name the characteristics of E. Coli. - ✔✔-Gram -
-short rods
-capsule is often present
-mucoid
-lactose fermentor
Name the 4 diseases caused by E. Coli. - ✔✔-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
1
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,-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? - ✔✔-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 - ✔✔-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? - ✔✔E.
Coli
Piglet Scours is another name for what? - ✔✔Neonatal Colibacillosis in
pigs 1-12 days of age. 70% mortality rate. Caused by K88 strain.
Differentials are TSE, Starvation, Clostridium Perfringens
2
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,What is another name for Post-Weaning Colibacillosis/E. Coli
Enterotoxemia? - ✔✔-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? - ✔✔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? - ✔✔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 - ✔✔-neonatal colisepticaemia
-respiratory colisepticaemia
-enteric colisepticaemia
Explain the process of respiratory colisepticaemia in Poultry - ✔✔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
3
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
, 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? -
✔✔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? - ✔✔0157:H7
What does the 0157:H7 strain of E. Coli cause in Humans? - ✔✔-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? - ✔✔Usually not
seen as an animal health pathogen
What can Citrobacter be mistaken for? - ✔✔Salmonella
-Citrobacter is a lactose fermenter, unlike Salmonella, but it is a delayed
fermenter, which can be a reason for the confusion
4
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
100% Correct Answers | Rated A+
Best Media for E. Coli? - ✔✔EMB
In the Family of Enterobacteriaceae, are there spore forming bacteria? -
✔✔Non-spore forming
Name the characteristics of E. Coli. - ✔✔-Gram -
-short rods
-capsule is often present
-mucoid
-lactose fermentor
Name the 4 diseases caused by E. Coli. - ✔✔-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
1
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,-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? - ✔✔-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 - ✔✔-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? - ✔✔E.
Coli
Piglet Scours is another name for what? - ✔✔Neonatal Colibacillosis in
pigs 1-12 days of age. 70% mortality rate. Caused by K88 strain.
Differentials are TSE, Starvation, Clostridium Perfringens
2
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,What is another name for Post-Weaning Colibacillosis/E. Coli
Enterotoxemia? - ✔✔-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? - ✔✔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? - ✔✔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 - ✔✔-neonatal colisepticaemia
-respiratory colisepticaemia
-enteric colisepticaemia
Explain the process of respiratory colisepticaemia in Poultry - ✔✔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
3
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
, 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? -
✔✔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? - ✔✔0157:H7
What does the 0157:H7 strain of E. Coli cause in Humans? - ✔✔-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? - ✔✔Usually not
seen as an animal health pathogen
What can Citrobacter be mistaken for? - ✔✔Salmonella
-Citrobacter is a lactose fermenter, unlike Salmonella, but it is a delayed
fermenter, which can be a reason for the confusion
4
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
