Question

How does Cholera affect and spread in the body?

Hint:

Cholera spreads via contaminated water and causes severe diarrhea by cholera toxin disrupting intestinal ion transport, leading to dehydration.

Answer 1

Transmission: Cholera is transmitted via the fecal-oral route, primarily through ingestion of water or food contaminated with *Vibrio cholerae* bacteria. Inadequate water sources, poor sanitation, and insufficient hygiene practices are key drivers of cholera's spread. Pathophysiology: Upon ingestion, the bacteria survive stomach acid and adhere to the small intestine's epithelial lining. They release cholera toxin, which targets enterocytes. This toxin activates adenylate cyclase, elevating intracellular cAMP levels. Consequently, excessive chloride ions and water are secreted into the intestinal lumen, while sodium absorption is inhibited. Clinical Effect: The profound loss of fluids and electrolytes manifests as the hallmark "rice water stools"—a watery, pale, odorless diarrhea. Rapid dehydration, electrolyte disturbances (potassium, sodium, bicarbonate depletion), reduced blood volume, hypovolemic shock, and potentially death occur if left untreated. Prevention: Preventive measures encompass ensuring access to safe drinking water, enhancing sanitation and hygiene, implementing effective sewage disposal, and conducting health education. Cholera vaccines are also available for use in endemic regions.