Vibrio cholerae vs Other pathogenic Vibrio species
How to tell Vibrio cholerae and Other pathogenic Vibrio species apart when a board question makes them look alike.
Cholera is water plus rice-water diarrhea; vulnificus is raw oysters/seawater plus sepsis or wounds; parahaemolyticus is seafood gastroenteritis.
Side by side
Contaminated water with painless profuse rice-water diarrhea and rapid dehydration from toxin-mediated secretion.
Seafood or seawater exposure: V parahaemolyticus causes gastroenteritis; V vulnificus causes severe wound infection or sepsis, especially in liver disease.
Cholera toxin ADP-ribosylates Gs, increasing cAMP and chloride/water secretion.
Marine Vibrio species use tissue invasion and virulence factors for seafood gastroenteritis or rapidly progressive wound/sepsis syndromes.
Rice-water stool, severe dehydration, and water/sanitation exposure point cholera.
Raw oysters with cirrhosis, hemorrhagic bullae, or seawater wound exposure points V vulnificus; seafood diarrhea without shock points V parahaemolyticus.
The trap
Raw seafood does not automatically mean cholera; severe liver-disease sepsis is V vulnificus until proven otherwise.
The repair move
For Vibrio, anchor on exposure: water, seafood gut illness, or seawater wound/sepsis.
Try a free question
CoreA patient has profuse painless rice-water diarrhea after drinking contaminated water. Dehydration develops rapidly, but stool has few inflammatory cells. Which organism is most likely?
Show answer and explanation
Answer: A. Vibrio cholerae. V cholerae causes toxin-mediated secretory watery diarrhea with rapid dehydration.
Why the other choices are tempting
- B. V parahaemolyticus causes seafood-associated gastroenteritis, often with abdominal cramps and sometimes inflammatory diarrhea.
- C. V vulnificus causes severe wound infection/sepsis after seawater or raw oysters, especially with liver disease.
- D. Shigella causes inflammatory dysentery and tenesmus.
- E. C jejuni causes inflammatory diarrhea after poultry exposure.
Flashcards
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What is the fastest separator for Vibrio cholerae vs Other pathogenic Vibrio species?
Cholera is water plus rice-water diarrhea; vulnificus is raw oysters/seawater plus sepsis or wounds; parahaemolyticus is seafood gastroenteritis.
What clue should make you choose Vibrio cholerae?
Contaminated water with painless profuse rice-water diarrhea and rapid dehydration from toxin-mediated secretion.
Quick answers
What is the fastest way to tell Vibrio cholerae from Other pathogenic Vibrio species?
Cholera is water plus rice-water diarrhea; vulnificus is raw oysters/seawater plus sepsis or wounds; parahaemolyticus is seafood gastroenteritis.
What is the key clue for Vibrio cholerae?
Contaminated water with painless profuse rice-water diarrhea and rapid dehydration from toxin-mediated secretion.
What is the key clue for Other pathogenic Vibrio species?
Seafood or seawater exposure: V parahaemolyticus causes gastroenteritis; V vulnificus causes severe wound infection or sepsis, especially in liver disease.
What is the common trap with Vibrio cholerae vs Other pathogenic Vibrio species?
Raw seafood does not automatically mean cholera; severe liver-disease sepsis is V vulnificus until proven otherwise.