In the present study , the influence of the administration of rFeIFN on blood markers of inflammation ( a-globulins , a 1acid glycoprotein ) and immune system activation ( g-globulins , IgG , IgM , specific anti-feline parvovirus IgG or IgM ) was evaluated in a cattery developing an outbreak of feline panleukopenia due to feline parvovirus ( FPV ) infection few days after initial administration of rFeIFN.