What is Chickenpox?

Chickenpox is a highly contagious viral infection caused by the varicella-zoster virus. It most commonly affects children, although adults can catch it too — often with more severe symptoms. It typically starts with fever, tiredness, and irritability, followed by an itchy red rash that turns into fluid-filled blisters before scabbing over.

Most cases are mild, but chickenpox can cause complications in newborns, pregnant women, or those with weakened immune systems. Once infected, people usually develop lifelong immunity, although the virus can remain dormant and reactivate later as shingles.