Gastroenteritis is an inflammation of the lining of the intestines caused by a virus, bacteria or parasites.Some call it Stomach Flu but it is not to be confused with Influenza which affects only your respiratory system — your nose, throat and lungs.
Symptoms are:
Watery diarrhea.
nausea and vomiting.
headache, muscle aches, joint aches.
fever, chills.
sweating, clammy skin.
abdominal cramps and pain.
loss of appetite.
weight loss.

Do rush to see your Doctor if you feel any of these Signs

HOW TO PREVENT IT:Preventing Viral Gastroenteritis
Wash your hands often, especially after using the bathroom and before food preparation. ...
If someone in your household is sick, do not share kitchen utensils, plates, or towels.
Do not eat raw or undercooked foods.
Wash fruits and vegetables thoroughly.
water contaminated by sewage
consuming raw or undercooked shellfish from contaminated waters Stay Alive .Dr.Wale .

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Nice post.

Moderator ,I humbly request that this thread be moved to the Front page .It a life saving Information .Thank you very Much.