“…Histophilus somni , previously known as Histophilus ovis , Haemophilus somnus or Haemophilus agni 10,2 is also an important cause of epididymitis in rams, and has additionally been isolated from cases of ovine septicaemia, mastitis, synovitis, polyarthritis and meningoencephalitis and from ovine vaginas 11,12 . Serology for A seminis and H somni is unreliable and the organisms may cross react with each other 13,14 …”