Chickenpox occurs most of the year with localised epidemics.

Chickenpox, or varicella, is an acute infectious disease due to a specific virus, and is associated with a typical rash.

The same virus causes herpes zoster or shingles, which is mainly confined to those who have previously had chickenpox.

Although mainly a disorder of middle childhood it can occur in babies and is not uncommon in adults.

The incubation period is around 14 days and it spreads from person to person by direct contact, by droplet infection in coughing or sneezing or being transferred by hands and even clothes.

Its onset may be associated with a fever and aches and pains or even with respiratory symptoms such as a cough and a running nose, for a few days before the rash appears.

The typical pock marks may be the first sign.

Chickenpox may be mild and show only a few spots. Other cases are more severe and may be associated with complications. Adults tend to get a more severe reaction.

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