Newcomer Supply Spirochete, Artificial Control Slides are for the positive histochemical staining of spirochetes, the causative agent of a variety of diseases such as; syphilis, bejel, pinta, yaws and lyme. Brachyspira hyodysenteriae, purchased from American Type Culture Collection, is used to produce the positive control tissue. Spirochete, Artificial Control Slides contain sections of positive staining rat lung.