Chickenpox, also known as varicella, is a highly contagious disease caused by the varicella-zoster virus. It is characterized by the appearance of itchy red bumps all over the body. The disease usually starts with flu-like symptoms such as fever, headache, and fatigue, followed by the development of a rash in the form of small, fluid-filled blisters. These blisters eventually dry up and form scabs, which will heal over time.

Chickenpox is primarily transmitted through respiratory droplets when an infected person coughs or sneezes. The virus can also be spread through direct contact with the fluid from the blisters. The incubation period of chickenpox is typically 10-21 days, during which a person may not show any symptoms but can still transmit the virus.

While chickenpox is usually a mild illness in children, it can cause more severe complications in adults, pregnant women, and people with weakened immune systems. In rare cases, it can lead to pneumonia, encephalitis (inflammation of the brain), or other serious complications.

Vaccination against chickenpox is available and highly recommended. The vaccine provides long-lasting protection against the disease and can prevent or lessen the severity of the infection. It is important to follow good hygiene practices, such as frequent handwashing and covering the mouth and nose when coughing or sneezing, to reduce the spread of the virus. If someone develops chickenpox, they should be isolated to prevent further transmission to others.