The term he used was miasms or bad air and he restricted his findings to his own work in obstetrics but you're correct. He had two clinics and one had doctors who also performed autopsies and since they didn't wash their hands between 'patients' when they birthed a baby or treated a pregnant woman they could easily spread infections. His second clinic had no autopsy facilities and he eliminated every other difference between them except for this. He was ridiculed at the time but he was proven right, though the cause was not bad air but microbes.