This article is from the Asthma FAQ, by Patricia Wrean and Marie Goldenberg email@example.com with numerous contributions by others.
According to the pamphlet "Advice from your Allergist", published
by the American College of Allergy & Immunology, children taking
oral or injected corticosteroids may be at increased risk of
complications from chicken pox. Such children should avoid
exposure to chicken pox -- if the child has been exposed, their
physician should be notified. However, the child's medications
shouldn't be changed without advice from their physician, since
corticosteroid therapy should not be stopped abruptly.
Children taking inhaled corticosteroids are not at this increased
risk, according to the pamphlet, since the system concentrations
of the medication are so small.