Norovirus (โนโรไวรัส)

Norovirus Information

Norovirus is a leading cause of viral gastroenteritis (inflammation of the stomach and intestines) worldwide, affecting both children and adults. It is notorious for causing sudden, severe vomiting and diarrhea. The virus is highly contagious—even a tiny amount can cause illness—and it is exceptionally resilient against heat and many common disinfectants, allowing it to spread rapidly in communities.

How Norovirus Spreads

Consuming contaminated food or water.
Direct contact with an infected person.
Touching contaminated surfaces or objects (toys, utensils, furniture).
In children, common behaviors like thumb-sucking or putting fingers in mouths after touching shared objects make daycares and schools high-risk zones for outbreaks.

Common Symptoms (Appearing 24–48 hours after exposure)

Nausea and sudden, projectile vomiting.
Watery diarrhea.
Abdominal pain or cramping.
Low-grade fever (though some cases reach 38–39°C).
Headache, fatigue, and muscle aches.

In children, symptoms appear abruptly. If a child suffers from frequent diarrhea and vomiting, it can lead to severe dehydration and shock, which requires immediate hospitalization.

Emergency Symptoms: Seek Medical Help Immediately

Massive amounts of watery stool, inability to keep fluids down, and high fever.
Decreased urination, lethargy, irritability, or cold hands and feet.
A rapid or weak pulse (these signs indicate potential shock or sepsis risk).

Diagnosis and Treatment

Diagnosis: Confirmed through a stool sample tested in a laboratory.

Treatment: There is no specific antiviral medication for Norovirus. Treatment is supportive, focusing on preventing dehydration through IV fluids or oral rehydration salts, fever management, and plenty of rest. With a strong immune system, most patients recover within 2–3 days.

Prevention Guidelines

Hand Hygiene: Wash hands frequently with soap and water. (Note: Alcohol gels are often ineffective against Norovirus).
Food Safety: Wash fresh produce thoroughly and ensure shellfish (especially oysters) are fully cooked.
No Sharing: Do not share cups, spoons, or personal utensils.
Sanitation: Avoid contact with the patient's stool or vomit. Infected individuals should not prepare food for others for at least 2 weeks, as the virus can remain in stool long after symptoms disappear.
School Policy: Sick children must stay home until they are fully recovered and symptom-free.