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 Cops following: The Animal Cops series inspired the formation of a 500-strong animal police force (), with full law-enforcement powers in the Netherlands, as agreed by the Dutch government coalition which formed in 2010. The first Dutch animal cops were officially certified on December 2, 2011 by the Security and Justice minister Ivo Opstelten. The Party for the Animals criticized the plan because the animal cops are only allowed to investigate the abuse of pets, not the abuse of farm animals. For the same reason, the Dutch animal cops are sometimes mockingly called the "guinea pig police" (). Animal Cops Animal