Final answer:
Chickenpox is a common childhood disease caused by the varicella-zoster virus, leading to pustular lesions on the skin and can later reactivate as shingles.
Step-by-step explanation:
Chickenpox is caused by the varicella-zoster virus, which is a member of the herpesvirus family. This virus is responsible for causing a common childhood disease characterized by the appearance of pustular lesions, primarily on the trunk of the body.
After the initial infection of chickenpox, the varicella-zoster virus can become latent in the body and can later reactivate to cause shingles, a condition that typically presents as a painful, localized rash on one side of the body.