Textbook Question
A patient with nausea, vomiting, and diarrhea within 5 hours after eating most likely has
a. shigellosis.
b. cholera.
c. E. coli gastroenteritis.
d. salmonellosis.
e. staphylococcal food poisoning.
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21. Principles of Disease
Bacterial Pathogenesis
2:42 minutesProblem 3
Textbook Question
Explain why E. coli is frequently implicated in cystitis in females.
Verified step by step guidance1
Understand that cystitis is an infection of the urinary bladder, commonly caused by bacteria entering the urinary tract.
Recognize that Escherichia coli (E. coli) is a normal inhabitant of the human intestinal tract and is the most common cause of urinary tract infections (UTIs), including cystitis.
Consider the anatomical differences in females, such as a shorter urethra compared to males, which facilitates easier bacterial access from the perineal area to the bladder.
Note that E. coli has specific virulence factors, such as fimbriae (pili), which allow it to adhere to the epithelial cells lining the urinary tract, helping it colonize and resist flushing by urine.
Combine these points to explain that the proximity of the female urethra to the anus, the shorter urethral length, and the adhesive properties of E. coli contribute to its frequent implication in cystitis in females.
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Pathogenicity of Escherichia coli
E. coli is a common bacterium in the human gut but certain strains possess virulence factors like adhesins and toxins that enable them to colonize the urinary tract, causing infections such as cystitis.
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Anatomical and Physiological Factors in Females
The female urethra is shorter and closer to the anus compared to males, facilitating easier bacterial entry from the gastrointestinal tract to the urinary tract, increasing susceptibility to infections like cystitis.
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Mechanism of Urinary Tract Infection (UTI) Development
UTIs develop when bacteria ascend the urethra to the bladder, adhere to the mucosal lining, and multiply, triggering inflammation; E. coli’s ability to adhere and evade host defenses makes it a frequent cause of cystitis.
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