Chickenpox Chickenpox is a highly contagious viral infection caused by the varicella-zoster virus. Chickenpox is very contagious. Symptoms include an itchy, blister-like rash in addition to other symptoms. Chickenpox illness usually lasts about 4 to 7 days. Children usually miss 5 to 6 days of school or childcare due to chickenpox. Symptoms of Chicken Pox […]