A bit if information on bovine TB.
Giggles it can take several years to develop to a stage where the animal becomes ill. During that time the animal is still highly infectious.
Although it’s called bovine TB it infects a wide range of animals, including digs and cats. Wildlife is particularly vunerable since those animals can roam the fields where the infected animal grazes. Contact isn’t important. The infection is in the urine and faeces and hence in the soil and grass.
Humans can be infected too, through contact and in the air. The infection is expelled in the animals breath.
When I was young, a number of people in my village had TB in varying forms. In the lungs and in tuberculoid sores. It came from working with animals and passed on in families. Vigilance by DEFRA and farmers, who understand the risk, has reduced human infection to minimal levels.