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*No growth on MacConkey agar
*No growth on MacConkey agar
*Growth enhanced by addition of blood or serum to media
*Growth enhanced by addition of blood or serum to media
===Pathogenesis and pathogenicity===
===Pathogenesis and pathogenicity===
*Haemolysin damages neutrophil membranes; release of hydrolytic enzymes from these neutrophils damages the corneal surface
*Haemolysin damages neutrophil membranes; release of hydrolytic enzymes from these neutrophils damages the corneal surface
*Isolates from carrier animals often avirulent, and are non-haemolytic and have no fimbriae; reversion to virulence can occur
*Isolates from carrier animals often avirulent, and are non-haemolytic and have no fimbriae; reversion to virulence can occur
===Clnical infections===
===Clnical infections===
*Subconjunctival or topical antimicrobials
*Subconjunctival or topical antimicrobials
*Isolate animals
*Isolate animals
*Reduce mechanical irritation
*Reduce mechanical irritation such as dust, grass, grass seeds
*Insect control
*Insect control
*Control concurrent infections
*Prophylactic oxytetracycline for animals at risk
*Prophylactic oxytetracycline for animals at risk
*Vitamin A supplementation
*Vitamin A supplementation