phylacogen

Etymology
From +

Noun

 * 1) Any of several bacterial derivatives developed by Dr. A. F. Schafer in 1910 to combat bacterial infections.
 * 2) * 1912, College of Physicians of Pittsburg, Pennsylvania, Symposium on the use of phylacogens (modified bacterial derivatives) (page 62)
 * As patient was steadily growing worse and becoming more emaciated and suffering from the increased pain, rheumatism phylacogen treatment was suspended, and a tuberculin test was made, which was markedly positive.