Actinobacillus seminis

• Epididymitis in young rams (4-8 months)
• Polyarthritis in lambs
• Organism found in prepuce
• Opportunistic infection causing abscesses in epididymides
• May be purulent discharge onto scrotal skin
• Specimens cultured on blood agar and incubated aerobically for 1-3 days produce pin-point haemolytic colonies which are catalase-positive; no growth on MacConkey agar