Most Streptococci are non-pathogenic, but a few species can cause significant morbidity and mortality ranging from death in young kittens, to pyometra and respiratory disease such as pneumonia[3]. Streptococcus canis, a particularly pathogenic bacteria in cats, utilise novel receptors for a proteolytic plasmin protein (mini-plasminogen) to induce fibrinolytic activity on mucous membranes and transmigration into the blood[4].