<prompt> T.pallidum can be grown inMiceArmadilloRodentRabbit  <response>: Virulent Treponema pallidum strains cannot be cultivated in aificial media but have been maintained for many decades by a serial testicular passage in rabbits. One such strain Nichols strain, isolated from the brain of a fatal case of general paralysis of the insane in 1912, is still being propagated and used for diagnostic and research purposes.Ref: Ananthanarayan 9th edition, p372 