A. Chicken pox is caused by a virus.
People get it through contact with someone who already has the disease.
The incubation period is 14 - 21 days. A. Symptoms are moderate elevation of temperature, headache, tiredness, and occasional sore throat. The rash breaks out within 24 hours after the onset of fever. Body temperature usually rises further after their appearance. Vesicles found in the mouth may look like small ulcers.