Varicella is caused by the varicella-zoster virus (VZV), which also causes shingles (herpes zoster). The virus typically affects children aged 2‒8 years.
The information contained in this fact sheet is intended for the purpose of general information and should not be used as a substitute for the individual expertise and judgement of healthcare professionals.
Seasonal influenza activity is still widespread in the EU/EEA, with a slight increase in positivity in sentinel primary care starting from week 5/2023 related to increased type B virus circulation.