I located a great book in a university library called: "Allergy: The History of a Modern Malady" Mark Jackson. The term "allergy" was coined by Austrian physician Clemens Von Pirquet in 1906 to describe to the new malady of "serum sickness" in response to the occasional adverse reactions to antisera injections developed in the 1890's. It was Pirquet who first understood that immunity and hyper-sensitization as the result of injection were two sides of the same coin. Here are some of the relevant passages I scanned from the library copy. I just ordered it so I can have my own copy.