title: Spirochetes in erythema chronicum migrans.
mesh_terms: D000818:Animals; D001733:Bites and Stings / Q000382:microbiology*; D006801:Humans; D013144:Spirochaetales / Q000302:isolation & purification*; D013194:Staining and Labeling; D013987:Ticks / Q000382:microbiology*