 Sahachiro Hata went over Ehrlich's work and found on 31 August 1909 that the rabbit, which had been injected with Salvarsan 606, was cured using only a single dose, the rabbit showing no adverse effect.The normal treatment procedure of syphilis at the time involved two to four years routine injection with mercury.Ehrlich, after receiving this information, performed experiments on human patients with the same success.