25 Questions
Which type of bacteria is Escherichia coli?
Gram-negative rod-shaped bacteria
What is the potential consequence of some strains of E. coli producing a toxin?
Severe diarrhea and potential fatality
What is the role of interspecific horizontal gene transfer in pathogen evolution?
It plays a role in pathogen evolution
How many virotype of E. coli are mentioned in the text?
There are 5 different virotypes
Which classification of diseases is mentioned in relation to E. coli?
Antigenic classification
What type of bacteria is Salmonella sp.?
Gram-negative rod-shaped bacteria
What is the potential consequence of consuming a hamburger infected with E. coli?
Severe illness
What is the classification of E. coli in terms of bacteria?
Proteobacteria
What is the name of the gene that allows E. coli O157:H7 to attach to intestinal cells?
Adhesins
What is the suspected reason for E. coli O157:H7's ability to cause disease?
It can attach to intestinal cells
What is the main method through which E. coli O157:H7 is spread to humans?
Contaminated meat consumption
What is a phenotype conferred by plasmids in E. coli?
Antibiotic resistance
What is the function of Shiga-like toxins?
Damage the cells that line the walls of blood vessels
What is the name of the gene responsible for E. coli attaching and effacing?
eae gene
How can E. coli O157:H7 be found on cattle farms?
In the intestines of healthy cattle
What is the suspected number of E. coli O157:H7 organisms required to cause disease?
Suspected to be very small
Which genera belong to the enteric bacteria within the gamma group of Proteobacteria?
Escherichia, Salmonella, Proteus, Enterobacter, and Shigella
Which class of E. coli is the leading bacterial cause of diarrhea in children in the developing world?
ETEC
Which strain of E. coli causes a syndrome identical to Shigellosis, with profuse diarrhea and high fever?
EIEC
Which class of E. coli causes bloody diarrhea, hemolytic-uremic syndrome, and sudden kidney failure?
EHEC
Which class of E. coli binds to the intestinal mucosa to cause watery diarrhea without fever?
EAggEC
Which class of E. coli causes diarrhea and lacks fimbriae, ST and LT toxins, but utilizes an adhesin known as intimin to bind host intestinal cells?
EPEC
Which statement about Escherichia coli is correct?
It is an indicator of fecal pollution in water supplies, swimming beaches, and foods
What are the characteristics of Escherichia coli?
Gram-negative, nonsporulating rods, facultative aerobes, and most can ferment lactose
At what age is the human bowel usually colonized by E. coli?
Within 40 hours of birth
Study Notes
Escherichia coli: Key Facts and Pathogenic Strains
- Escherichia coli belongs to the enteric bacteria within the gamma group of Proteobacteria
- Key genera include Escherichia, Salmonella, Proteus, Enterobacter, and Shigella
- Characteristics: gram-negative, nonsporulating rods, facultative aerobes, and most can ferment lactose
- E. coli is an indicator of fecal pollution in water supplies, swimming beaches, and foods
- The human bowel is usually colonized by E. coli within 40 hours of birth
- E. coli can cause intestinal diseases such as diarrhea
- Five classes of E. coli cause diarrheal diseases: ETEC, EIEC, EHEC, EPEC, and EAggEC
- ETEC is the leading bacterial cause of diarrhea in children in the developing world
- EIEC infection causes a syndrome identical to Shigellosis, with profuse diarrhea and high fever
- EPEC causes diarrhea and lacks fimbriae, ST and LT toxins, but utilizes an adhesin known as intimin to bind host intestinal cells
- EAggEC bind to the intestinal mucosa to cause watery diarrhea without fever
- EHEC, particularly O157:H7, causes bloody diarrhea, hemolytic-uremic syndrome, and sudden kidney failure, and produces Shiga-like toxin.
Test your knowledge of Escherichia coli with this quiz covering key facts and pathogenic strains. Explore its characteristics, role as an indicator of fecal pollution, and its association with diarrheal diseases. Learn about the different classes of E. coli and their distinct impacts on human health.
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