About Varicella

About Varicella

Varicella (Chickenpox) Overview
Chickenpox is a highly contagious viral infection caused by the varicella-zoster virus. In Ireland, there are approximately 58,000 cases annually, primarily affecting children under 10 years old, though people of any age can be infected.^1,2

Clinical Impact

• Around 1 in 250 cases require hospitalisation due to complications such as bacterial skin infections, pneumonia, or neurological issues.^2,3
• Symptoms typically appear 10 to 21 days after exposure and include: ³
  • A characteristic itchy rash with fluid-filled blisters that crust over in 1-2 weeks ^1,3
  • Fever, fatigue, headache, and loss of appetite ^1,3

Contagious Period
Patients are contagious 1-2 days before the rash appears until all blisters have scabbed over. Scabs naturally fall off after 1-2 weeks.^1,3

Long-term Considerations
After recovery, the virus remains dormant in nerve cells and can reactivate later in life as shingles.¹

Chickenpox Prevention: What You Need to Know

Varicella Vaccination with VARIVAX

• VARIVAX is indicated for individuals aged 12 months and older.⁴
• The varicella vaccine is now part of Ireland’s routine childhood immunisation schedule. From 1 October 2025, all babies born on or after 1 October 2024 are eligible to receive the vaccine free of charge at 12 months of age, administered through GPs.⁵
• Children born before this date, or non-immune individuals aged ≥12 months, should consult their GP or pharmacist about vaccination.
• Individuals should receive two doses of the vaccine to ensure optimal protection against Varicella.⁴

Key Takeaways

• Be aware of the recent changes to the primary childhood immunisation schedule and advise parents accordingly.
• Recognise chickenpox symptoms early and educate patients on contagiousness and complications.
• Consider vaccination for susceptible individuals, especially those at higher risk of severe disease.

Useful Resources

To support your consultations and patient education on chickenpox, explore the following resources:

Patient-Friendly Information
Visit www.chickenpoxaware.ie for comprehensive, easy-to-understand materials designed for patients.

Multilingual Resources
Access patient-friendly materials available in Polish and Ukrainian to better support diverse communities.

‘5 Things About Chickenpox’ Leaflet
Download this concise leaflet to provide clear, essential information during consultations. Order a pack of chickenpox patient leaflets directly through msdconnectie@msd.com.

Practice Materials
Print our ‘Be Chickenpox Aware’ poster to display in your surgery or pharmacy, helping raise awareness among patients.

IE-VVX-00130 | Date of preparation: October 2025