DTH reactions may include, but are not limited to, contact dermatitis (eg, poison ivy rash), tuberculin skin test reactions, granulomatous inflammation (eg, sarcoidosis, Crohn disease), allograft rejection, graft versus host disease, and autoimmune hypersensitivity reactions.
tricks of the trade. 1  Clever ways of operating a business or performing a task or activity, especially slightly dishonest or unfair ones. For example, Alma knows all the tricks of the trade, cutting the fabric as close as possible, or The butcher weighs meat after it's wrapped; charging for the packaging is one of the tricks of the trade.
trade. 1  the act or process of buying, selling, or exchanging commodities, at either wholesale or retail, within a country or between countries: domestic trade; foreign trade. 2  the act of buying, selling, or exchanging stocks, bonds, or currency: Stock brokerages typically charge a commission per trade. 3  a purchase or sale; business deal or transaction.