Chickenpox is notoriously contagious, and for some people it can be very dangerous. Women who are pregnant, young children, the elderly and people with a weakened immune system are at greatest risk of complications.
The U.S. Centers for Disease Control and Prevention mentions these potential complications of chickenpox:
- Pneumonia, blood poisoning or dehydration.
- Brain inflammation or infection.
- Bacterial infection affecting the skin or soft tissues, especially among children.
- Infection of the joints or bones.
- Toxic shock syndrome.
- Unusual bleeding.