Anaphylactic shock occurred in a 9-year-old myasthenic boy after induc
tion of anesthesia for thymectomy. Resuscitation was successful. Subse
quent skin testing identified latex as the cause. Although the patient
was not in a high-risk group for latex allergy, detailed questioning
confirmed that sensitivity had developed during repeated exposures in
previous anesthesia and dental care. Six months later, after taking st
eroids and antihistaminic drugs prophylactically and avoiding all late
x-containing products, the boy underwent uncomplicated thymectomy. The
possibility of latex allergy should be borne in mind when dealing wit
h patients previously exposed to repeated medical care. Adequate, late
x-free equipment should be available in operating rooms to deal with p
atients who are allergic to latex.