title: [Attempt at obtaining pathogenic treponemes of the Nichols strain with a lowered susceptibility to penicillin].
mesh_terms: D000818:Animals; D008297:Male; D010402:Penicillin G Procaine / Q000494:pharmacology*; D011817:Rabbits; D013737:Testis / Q000382:microbiology; D014210:Treponema pallidum / Q000187:drug effects* / Q000302:isolation & purification / Q000472:pathogenicity
chemical_list: D010402:Penicillin G Procaine
vernacular_title: Próba uzyskania patogennych kretkòw szczepu Nicholsa o zmniejszonej wrazliwosci na penicyline