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Overview

Astrovirus Infection: Overview

Astrovirus infection is a contagious viral infection of the digestive tract that commonly causes gastroenteritis, including diarrhea and vomiting. It most often affects young children, but older adults and people with weakened immune systems may also become seriously ill. Most cases are short-lived, although symptoms can be more severe or last longer in vulnerable people.

Symptoms

Symptoms of Astrovirus Infection

Symptoms usually begin after exposure and are often mild to moderate. Illness may be more severe or prolonged in infants, older adults, and people with weakened immune systems.

  • Watery diarrhea
  • Vomiting
  • Nausea
  • Stomach pain or cramps
  • Fever
  • Reduced appetite

WATCH FOR DEHYDRATION

Know the warning signs

Contact a clinician if there is very little urination, a dry mouth, no tears when crying, unusual sleepiness, dizziness, or an inability to keep fluids down. These can be signs of dehydration and may require prompt treatment.

How It Spreads

How Astrovirus Infection Spreads

Astrovirus spreads when microscopic amounts of stool or vomit enter another person’s mouth. This can happen through contaminated hands, food, water, surfaces, or shared objects.

  • Close contact with an infected person can spread the virus, especially when caring for someone who has diarrhea or vomiting.
  • Contaminated food or water can carry the virus into the digestive tract.
  • Touching contaminated surfaces or objects and then touching the mouth can lead to infection.

Risk Factors

Risk Factors for Astrovirus Infection

  • Young age, especially infancy, increases the likelihood of infection and dehydration.
  • Older age can increase the risk of complications from fluid loss.
  • A weakened immune system can lead to more severe or prolonged illness.
  • Living in or spending time in group settings, such as childcare or long-term care, increases exposure opportunities.
  • Close contact with an infected person makes transmission more likely.
  • Limited access to clean water or handwashing facilities can make prevention more difficult.

Age and immune status are non-modifiable risk factors. Exposure-related risks can often be reduced through thorough hand hygiene, safe food handling, cleaning shared surfaces, and avoiding close contact with someone who is actively ill.

Complications

Complications of Astrovirus Infection

  • Dehydration can develop when diarrhea or vomiting causes more fluid loss than a person can replace.
  • Electrolyte abnormalities can occur when fluid loss changes the body’s salt and mineral balance.
  • Hospitalization may be needed when a person cannot replace fluids by drinking.
  • People with weakened immune systems may develop prolonged or severe diarrhea.

WHEN COMPLICATIONS NEED ATTENTION

Act quickly when fluid loss is severe

Dehydration can become dangerous quickly in infants, older adults, and people with serious medical conditions. Inability to drink or markedly reduced urination are urgent concerns that need medical assessment.

Diagnosis

Diagnosis of Astrovirus Infection

Clinicians usually assess symptoms, how long they have lasted, possible exposure to illness, hydration status, and physical examination findings. Many mild cases of gastroenteritis do not require a specific viral test.

Stool testing

A stool sample may be tested with a molecular or multiplex gastrointestinal panel when illness is severe or prolonged, occurs during an outbreak, affects a person with a weakened immune system, or needs to be distinguished from bacterial or parasitic causes. These tests can help identify astrovirus and guide further evaluation.

Treatment & Management

Treatment and Management of Astrovirus Infection

There is usually no specific antiviral treatment for Astrovirus infection. Care focuses on replacing fluids and electrolytes while the immune system clears the infection.

  • Offer frequent small sips of oral rehydration solution to replace fluids and electrolytes.
  • Continue breastfeeding or age-appropriate feeding when tolerated.
  • Encourage rest during recovery.
  • Seek medical guidance before giving anti-diarrheal medicines to children.

Prevention

Preventing Astrovirus Infection

  • Wash hands with soap and water after using the toilet or changing diapers and before preparing food.
  • Clean and disinfect surfaces contaminated by stool or vomit.
  • Wash soiled laundry promptly and handle it carefully.
  • Avoid preparing food for other people while ill.
  • Keep sick children home from childcare according to local guidance.

Alcohol-based hand sanitizer may be less reliable when hands are visibly soiled or for some stomach viruses. Soap-and-water handwashing should be emphasized, especially after using the toilet, changing diapers, or cleaning vomit or diarrhea.

Outlook and Prognosis

Outlook and Prognosis for Astrovirus Infection

Most otherwise healthy people recover from Astrovirus infection with supportive care over several days. Diarrhea and reduced appetite may take longer to fully resolve, and recovery can be less predictable when dehydration or other health problems are present.

  • Infancy can be associated with a greater risk of dehydration and a longer recovery.
  • Older age can make it harder to replace fluids lost through diarrhea or vomiting.
  • Weakened immunity may allow symptoms to persist or become more severe.
  • Significant dehydration can delay recovery and require medical treatment.
  • Inability to maintain fluid intake increases the risk of complications.

When Should You See a Doctor

When Should You See a Doctor?

SEEK MEDICAL ADVICE

Know when to get help

Seek prompt medical care for signs of dehydration, repeated vomiting, inability to keep fluids down, bloody stool, severe or worsening abdominal pain, high or persistent fever, confusion, unusual sleepiness, or diarrhea that does not improve.

  • Infants should be assessed early if they develop significant diarrhea, vomiting, or reduced fluid intake.
  • Older adults should contact a clinician early because dehydration can develop quickly.
  • People with weakened immune systems should seek early medical advice for symptoms.
  • People with significant chronic medical conditions should ask a clinician when to be evaluated.

Call emergency services for collapse, severe confusion, difficulty breathing, or other signs of a life-threatening emergency. Follow local medical guidance, particularly for infants, older adults, and people with serious health conditions.

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Symptoms

2 topics

  • Astrovirus Infection

    Fever

  • Astrovirus Infection

    Vomiting