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
Which Side Which Side Which Side Podcast is a political podcast hosted by animal rights activist and Grand Jury resister Jordan Halliday and Jeremy Parkin. It features various guests with discussions involving animal rights, earth rights, atheism, anarchism, and many other topics. Which Side has been releasing episodes every week on iTunes and Stitcher since November 2012. The podcast takes its name from the folk song Which Side Are You On?. Which Side Podcast helped found the Which Side Media Collective which it is also a member of. The collective helps have a central outlet for helping distribute and create radical content.