Add Yahoo as a preferred source to see more of our stories on Google. Chicken pox can spread quickly in people who aren't vaccinated. (Illustration: Liliana Penagos; Photo: Getty Images) (Illustration ...

Chickenpox is contagious 1-2 days before you develop a rash and until all blisters crust over. The varicella vaccine is highly effective and decreases chickenpox cases significantly. If untreated, ...

Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV). It mainly affects children but can also occur in adults. Once someone contracts chickenpox, they usually become ...

Kathryn Edwards, MD, remembers a time when chickenpox was so common that clinicians could diagnose it at a glance, and children were hospitalized for complications of the disease. Today, less than 150 ...