Trypsin and chymotrypsin are proteolytic pancreatic enzymes that are secreted as the inactive precursors trypsinogen and chymotrypsinogen, respectively. They have several pharmacological as well as laboratory applications, especially in protein chemistry. Exposure to enzyme dusts has long been known to cause immediate occupational hypersensitivities of the airways. Also trypsin and chymotrypsin are potential inhalable sensitizers, and clear cases of specific airway sensitization caused by trypsin- and chymotrypsin-containing products have been reported by several studies. Positive skin prick and challenge tests as well as specific IgE antibodies have been described. These results and the clinical symptoms usually matched well, suggesting an immunological mechanism of action. Immediate urticarial reactions of the skin due to contact with these enzymes are possible, but there is no clear evidence of allergic cell-mediated delayed eczematous skin reactions.
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