You are mixing up toxo and campylobacter.You're quite right that toxo doesn't spread from ewe to ewe but an infected ewe does shed the disease in her urine and faeces as well as in contaminated afterbirth IIRC. Pretty sure the vets used to advise putting aborted ewes in with dry ewes to avoid infecting other in lamb ewes but also to deliberately infect dry ewes so that they would be immune the following year.
Sheep cannot pass toxo infection from one to another - has to go via a cat.