Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV).  The classic symptom of chickenpox is a rash that develops into itchy, fluid-filled blisters that eventually turn into scabs. Other symptoms that may appear 1-2 days prior to the rash are fever, tiredness, loss of appetite and headache. For more information on chicken pox click on the CDC link below. 

https://www.cdc.gov/chickenpox/about/index.html 

To prevent the disease, the varicella immunization is given at 12-15 months of age and 4-6 years of age. For more information on the vaccine, click on the link below. 

https://www.cdc.gov/vaccines/parents/diseases/varicella.html