“…They also demonstrated that the agglutinogen produced an allergic-type skin reaction in sensitized animals and human beings. Because of the practical need of a simple and specific method to test susceptibility to whooping cough and to ascertain the effect of vaccination against whooping cough, clinical use of the agglutinogen as a skin test reagent has been reported by many authors (Felton and Flosdorf, 1943;Flosdorf et al, 1943;Sauer and Markley, 1946;Felton and Flosdorf, 1946;Felton, Smolens, and Mudd, 1946;Halpern and Halpern, 1948;Miller, Ryan, and Havard, 1948;Kohn et al, 1950;Zenyoji, 1952;Someya, 1955).…”