Recombinant bactericidal/permeability-increasing protein (rBPI21) for treatment of parvovirus enteritis: a randomized, double-blinded, placebo-controlled trial.

We evaluated the ability of an antimicrobial and endotoxin-neutralizing agent, the recombinant amino terminal fragment of bactericidal permeability-increasing protein (rBPI21), to decrease plasma endotoxin concentration and severity of clinical signs of canine parvovirus and to improve survival. This randomized, double-blinded, placebo-controlled clinical trial included 40 client-owned dogs and 9 normal puppies from a closed research colony. Dogs weighing >5 kg (11 lb) with fecal antigen-confirmed parvovirus and clinical signs of vomiting and diarrhea were randomly assigned to receive placebo or rBPI21 infusion over 6 hours. Plasma endotoxin concentration was measured at 0, 3, and 6 hours of infusion. Owners chose continued medical care with either the Veterinary Hospital of the University of Pennsylvania Internal Medicine Service or a local veterinarian. Telephone follow-up was conducted at 14 days. Surviving dogs were reevaluated at >30 days (recovered group), at which time plasma samples for measurement of endotoxin concentration were obtained. Plasma endotoxin concentrations were significantly higher in dogs with parvovirus than in normal or recovered dogs. Despite 90% survival, the rBPI21 treatment did not have a significant effect on outcome, duration of hospitalization, or plasma endotoxin concentrations. Treatment in a tertiary care hospital, however, significantly improved survival but resulted in a significantly increased duration of hospitalization. Endotoxemia occurs in dogs with parvovirus enteritis, but rBPI21 is not associated with improved survival.