Chickenpox

Chickenpox is a viral infection and is highly contagious. It is caused by the varicella-zoster virus (VZV). Chickenpox is generally seen in babies but can affect the adults as well as people with weakened immune systems. It causes a blister-like rash, itching, tiredness and fever. Chickenpox spreads in the air through coughing or sneezing. It can also be spread by touching or breathing in the virus particles that come from chickenpox blisters.
The incubation period is for about 10-21 days after contact with an infected person. Chickenpox is most infectious from one to two days before the rash appears until all the blisters have crusted over.