Difficulty drinking and eating.
Changes in skin colour and/or permanent scarring.
Around 1 in 20 children develop a bacterial skin infection that needs to be treated with antibiotic medicine.
Bacterial skin infections can cause bacterial infection in other parts of the body including the blood (septicaemia).
Around 1 in 4,000 children develop inflammation of the central nervous system causing uncoordinated movements (cerebellar ataxia) that gradually improve.
Pneumonia is more likely to occur as a complication in adults, particularly pregnant women during the last trimester of pregnancy.
Inflammation of the joints (arthritis), bone (osteomyelitis), liver (hepatitis) and blood vessels supplying the brain with blood (intracranial vasculitis).
Around 4 in 10,000 develop brain inflammation (encephalitis). Infants less than one year of age and adults have the highest risk.
In developed countries:
Between 2-6 in 100,000 require hospitalisation
Overall death rate of 2-4 in 100,000
Maternal chickenpox during pregnancy can infect the fetus:
Up to 2 in 100 infants exposed to the disease during the first 20 weeks of pregnancy will be born with congenital varicella syndrome and may have skin scarring, eye, limb and brain abnormalities, developmental delay and a poor outcome.
Maternal chickenpox within five days before and two days after delivery can infect the newly born infants:
Up to 30 in 100 new-borns with chickenpox develop severe disease that can result in death.
Reye’s Syndrome may occur in children if aspirin (salicylate or salicytic acid) is given after a viral infection in children, including chickenpox.
Shingles, in later life causing severe pain which can be prolonged and disabling.