Experimentally induced severe canine parvoviral enteritis

Area of Science:

• Veterinary Virology
• Pathology
• Immunology

Background:

• Canine parvovirus (CPV) is a highly contagious pathogen causing severe gastrointestinal disease in puppies.
• Understanding the temporal progression of CPV infection is crucial for developing effective treatments and preventative strategies.

Purpose of the Study:

• To elucidate the pathogenesis of canine parvovirus enteritis.
• To document the sequential pathological changes and clinical manifestations following oral CPV inoculation in puppies.

Main Methods:

• Oral inoculation of 8-week-old puppies with CPV.
• Daily monitoring for clinical signs, including mortality.
• Serial blood sampling for virological (viraemia) and haematological (leucopenia) analysis.
• Pathological examination of tissues at various time points post-infection.

Main Results:

• Severe enteritis developed 3-9 days post-infection, with peak severity at day 7 and one mortality.
• Viraemia was detected on days 4-5, followed by severe leucopenia on days 6-8.
• Antibody response initiated by day 4, with high titres by day 7.
• Pathological findings included Peyer's patch necrosis (day 3), widespread lesions with tonsil and thymus necrosis (days 5-7), numerous viral inclusion bodies (day 5), and persistent villous atrophy (day 13).

Conclusions:

• CPV infection induces rapid and severe pathological changes, primarily affecting lymphoid tissues and the intestinal villi.
• The observed viraemia, leucopenia, and pathological progression provide insights into the disease pathogenesis.
• The findings highlight the critical early stages of infection and the prolonged recovery period, emphasizing the need for prompt diagnosis and supportive care.