Ovine pulmonary adenocarcinoma be predisposed to OPA. Most affected sheep show signs at 2 to 4 years of age. OPA is not a notifiable disease, and therefore it is difficult to assess its prevalence. OPA was first described in the UK in 1888, and described in detail in South Africa in 1891. The disease was initially known as "jaagsiekte" , a word derived from Afrikaans, meaning "chasing sickness," so called because animals are in respiratory distress as if they are out of breath from being chased. It has also been known as sheep pulmonary adenomatosis and ovine pulmonary carcinoma. OPA has been used
Animal geography Animal geography Animal geography is a subfield of the nature-society/human-environment branch of geography as well as a part of the larger, interdisciplinary umbrella of Human-Animal Studies (HAS). Animal geography is defined as the study of “the complex entanglings of human-animal relations with space, place, location, environment and landscape” or “the study of where, when, why and how nonhuman animals intersect with human societies.” Recent work advances these perspectives to argue about an ecology of relations in which humans and animals are enmeshed, taking seriously the lived spaces of animals themselves and their sentient interactions with not just human but other