what are chicken pox caused by
Causes of chickenpox. Chickenpox is caused by the varicella-zoster virus. You catch it by coming into contact with someone who is infected.Chickenpox is a very contagious infection. Around 90% of people who have not previously had chickenpox will become infected when they come into contact with the virus.auses of chickenpox. Chickenpox is caused by the varicella-zoster virus. You catch it by coming into contact with someone who is infected.