What it is
Canine parvovirus attacks rapidly dividing cells: the intestinal lining and the bone marrow. Unvaccinated puppies get severe vomiting and bloody diarrhea, lose protein and fluid, and their white cell count crashes, leaving them open to bacterial infection from their own gut. With intensive care most survive; without it, most don't.
Why plasma
Puppies with parvo lose a lot of protein through the damaged gut, and plasma has been used to replace it and to supply antibodies. The evidence for antibody-rich "immune plasma" is mixed: a randomized trial of a single dose found no clear benefit,1 and a 2020 trial of hyperimmune plasma likewise found no improvement in survival or hospital time.2 Plasma is still used case by case for puppies with dangerously low protein. Vaccination remains the thing that actually prevents this disease.
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Research and references
Peer-reviewed sources for what's on this page. Each link runs a PubMed search for the paper so you land on the abstract, and often the full text.
- 1Bragg RF, Duffy AL, DeCecco FA, et al. Clinical evaluation of a single dose of immune plasma for treatment of canine parvovirus infection J Am Vet Med Assoc. 2012;240(6):700-704. PubMed
- 2Acciacca RA, Sullivan LA, Webb TL, Johnson V, Dow SW. Clinical evaluation of hyperimmune plasma for treatment of dogs with naturally occurring parvoviral enteritis J Vet Emerg Crit Care. 2020;30(5):525-533. PubMed