[[File:Chickenpox.jpg|thumb|350px|left|Chickenpox]]
Cause of chicken pox is mainly because of varicella-zoster virus (VZV). About 90% of non-immune people with direct exposure to sufferers are most likely to catch the virus. VZV is communicable by both respiratory droplets (i.e. coughing, sneezing) and direct skin contact. Symptoms of chicken pox may appear as early as 10 to 21 days after exposure and onset of disease from 12 to 14 days.