Escherichia coli

Question 1

What is the place of Escherichia coli ?

Answer 1

in water is Indicator of recent fecal pollution of water

Question 2

What is the Feature of Escherichia coli ?

Answer 2

1- Gram negative bacilli
2- non-spore forming
3- lactose fermenter
4- catalase +
5- oxidase –

Question 3

What is the two toxins of Escherichia coli ?

Answer 3

1- heat labile (LT)

2- heat stable (ST)

Question 4

Verotoxin or Shiga-like toxin is produced by ?

Answer 4

enterohaemorrhagic E. coli.

Question 5

What is the Diarrhogenic E. coli ?

Answer 5

1- Enterotoxigenic E. coli (ETEC)
2- Enteropathogenic E. coli (EPEC)
3- Enteroinvasive E. Coli (EIEC)
4- Enterohaemorrhagic E. coli (EHEC) or Verotoxigenic E. coli (VTEC)

Question 6

Enterotoxigenic E. coli (ETEC) causes ?

Answer 6

“travellers’ diarrhea” and infantile (weaning) diarrhea. (watery diarrhea)

Question 7

Enteropathogenic E. coli (EPEC) can causes ?

Answer 7

gastroenteritis in children (infantile diarrhea)

Question 8

What is the virulence of Enteropathogenic E. coli (EPEC) ?

Answer 8

Bundle forming pili

Question 9

Enteroinvasive E. Coli (EIEC) can causes ?

Answer 9

stool with pus and blood (dysentery), fever.

Question 10

Enterohaemorrhagic E. coli (EHEC) or Verotoxigenic E. coli (VTEC) can causes ?

Answer 10

Hemolytic uremic syndrome

Question 11

Found in animal intestine, causes disease due to the ingestion of contaminated food as of bovine
origin as undercooked meat.

Answer 11

Enterohaemorrhagic E. coli (EHEC) or Verotoxigenic E. coli (VTEC)

Question 12

What is the Diarrhogenic E. coli that can cause (dysentery) ?

Answer 12

Enteroinvasive E. Coli (EIEC)

Question 13

What is the culture of Escherichia coli ?

Answer 13

Mac Conkey’s agar plates → lactose fermenter colonies

Question 14

What is the Biochemical reactions of Escherichia coli ?

Answer 14

Indole positive

Question 15

What is the Non-Diarrheogenic E. coli→ causes extraintestinal diseases (Diarrhea) ?

Answer 15

1- Uropathogenic E. coli
2- E. coli causing neonatal meningitis
3- E. coli causing other Infections: Health-care Associated Infections ( HAI)

Question 16

What is the virulence of Uropathogenic E. coli ?

Answer 16

1- P fimbriae adhesins (for colonization)

2- Hemolysins (β-hemolytic)

Question 17

What is the type of E. coli that cause of honeymoon cystitis ?

Answer 17

Uropathogenic E. coli

Question 18

What is the virulence of E. coli causing neonatal meningitis ?

Answer 18

1- K1
2- capsular
3- invade the blood stream
infection