Bugs Causing Diarrhea

Question 1

which bugs cause bloody diarrhea?

Answer 1

• Campylobacter
• E. histolytica
• Enterohemorrhagic E. coli
• Enteroinvasive E. coli
• Salmonella
• Shigella
• Y. enterocolitica

Question 2

which bugs cause watery diarrhea?

Answer 2

• C. difficile
• C. perfringens
• Enterotoxigenic E. coli
• Protozoa
• V. cholerae
• Viruses

Question 3

Campylobacter

Answer 3

• comma or S shaped organisms
• growth at 42 deg C

Question 4

E. histolytica

Answer 4

• protozoan
• amebic dysentery
• liver abscess

Question 5

Enterohemorrhagic E. coli

Answer 5

• O157:H7
• can cause HUS
• makes Shiga-like toxin

Question 6

Enteroinvasive E. coli

Answer 6

• invades colonic mucosa

Question 7

Salmonella

Answer 7

• lactose -
• flagellar motility
• has animal reservoir, especially poultry and eggs

Question 8

Shigella

Answer 8

• lactose
• very low ID₅₀
• produces shiga toxin (human reservoir only)
• bacillary dysentery

Question 9

Y. enterocolitica

Answer 9

• day care outbreaks
• pseudoappendicitis

Question 10

C. difficile

Answer 10

• pseudomembranous colitis
• caused by antibiotics
• occasionally bloody diarrhea

Question 11

C. perfringens

Answer 11

• also cause gas gangrene

Question 12

Enterotoxigenic E. coli

Answer 12

• Travelers’ diarrhea
• produces heat labile (LT) and heat stable (ST) toxins

Question 13

name the Protozoa that cause watery diarrhea

Answer 13

• Giardia
• Cryptosporidium

Question 14

V. cholerae

Answer 14

• comma shaped organisms
• rice water diarrhea
• often from infected seafood

Question 15

name the viruses that cause watery diarrhea

Answer 15

• rotavirus
• norovirus
• adenovirus