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.
For the British slave traders it was a three-legged journey, called the 'triangular trade': Taking trade goods, such as guns and brandy, to Africa to exchange for slaves. Then taking the slaves on the 'Middle Passage' across the Atlantic to sell in the West Indies and North America.he slave trade began with Portuguese, and some Spanish, traders taking African slaves to the American colonies they had conquered in the 15th century.