A mechanic working in the antibiotic capsuling section of a pharmaceutical company developed asthmatic attacks 1 year after starting work. His occupation involved exposure to a variety of chemical agents including tetracycline. He developed immediate weal and flare reaction to the intradermal test and an immediate (type 1) asthmatic response to intradermal, inhalation and oral challenge tests with tetracycline. On leaving the tetracycline plant he became symptom free.
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