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I was reading that diseases such as Cholera & Typhoid are Vector-borne diseases wherein the Vector transfer the harmful bacteria to contaminate our food/water, causing the disease in humans.

By the same analogy, Diarrhoea (or, Diarrhea) too is caused when Rotavirus contaminates one's food/water. And obviously some agent (vector) would be needed to carry the Rotavirus to that food/water. Then why isn't Diarrhoea too classified as a vector-borne disease?

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While I do agree with previous answer suggesting that diarrhea is a symptom rather than a disease, I would like to add the following:

According to the WHO, diarrhea is defined as

the passage of three or more loose or liquid stools per day (or more frequent passage than is normal for the individual).

While, infectious causes (virus, bacteria, parasite) are the most frequent aetiologies for diarrhea, other conditions can lead to diarrhea such as:

  • drugs (laxatives, antibiotics) that lead to an inflammation of the
    mucosa and therefore to an alteration in liquid absorption/secretion in the intestine
  • inflammatory bowel diseases
  • neoplasia (colon cancer)
  • malabsorption diseases such as celiac disease

References:

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I would assume because it is a symptom, not virus, bacteria, condition, etc, and a symptom is not the same as a disease.

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