title: Mass cultivation of avirulent Treponema pallidum (Nichols).
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D001216:Asparagine; D001431:Bacteriological Techniques; D002452:Cell Count; D002470:Cell Survival; D003470:Culture Media; D003720:Densitometry; D007106:Immune Sera; D008722:Methods; D010461:Peptones; D011817:Rabbits / Q000276:immunology; D013053:Spectrophotometry; D013141:Spiro Compounds; D013864:Thioglycolates; D014210:Treponema pallidum / Q000254:growth & development* / Q000472:pathogenicity; D014774:Virulence
chemical_list: D003470:Culture Media; D007106:Immune Sera; D010461:Peptones; D013141:Spiro Compounds; D013864:Thioglycolates; D001216:Asparagine