Child resting with stomach ache
Health Information

Stomach Flu (Acute Gastroenteritis)

Acute gastroenteritis, commonly known as stomach flu, is a contagious illness. Learn what to watch for and when your child can safely return to school.

Medical Concept

Understanding Stomach Flu.

What Is Acute Gastroenteritis?

Acute gastroenteritis is characterized by vomiting usually followed by frequent, loose, watery stools and abdominal cramping. It is sometimes accompanied by a fever. Symptoms typically last two to five days. The incubation period is 24 to 72 hours.

How It Spreads

The period of communicability is during the acute stage and for a short time thereafter while the infectious agent is being excreted. This means your child can spread the illness to others during and shortly after having symptoms.

School Policy

School Guidelines for Stomach Flu.

When to Keep Your Child Home

If your student shows any signs or symptoms of acute gastroenteritis, they should be excluded from school to prevent the spread of disease to other students.

Vomiting two or more times
Diarrhea with two or more loose stools requiring frequent trips to the bathroom
Abdominal cramping
Fever

When Your Child Can Return

Your child may return to school when they meet both of these conditions:

Symptom-free for at least 24 hours (no vomiting or diarrhea)
Have resumed a normal diet without recurrence of symptoms

Even if your child feels better, do not send them to school if symptoms return or if they have not been symptom-free for a full 24 hours.

Treatment & Care

Home Care Tips.

While your child is recovering at home:

Ensure they stay hydrated with clear fluids like water, broth, or electrolyte solutions
Avoid dairy, fatty foods, and high-fiber foods until fully recovered
Reintroduce foods gradually as symptoms improve
Keep them resting at home until symptoms have completely resolved
Wash hands frequently, especially after using the bathroom
Clean and disinfect bathroom surfaces regularly
Seek Medical Care

When to Call the Doctor.

Contact your child's doctor if:

Symptoms last longer than five days
Your child shows signs of dehydration (dry mouth, no tears when crying, decreased urination)
There is blood in the vomit or stool
Fever is very high or persistent
Severe abdominal pain that doesn't improve
Get in Touch

Questions or Concerns?

If you have questions about your child's symptoms or whether they are ready to return to school, contact your school nurse.