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Canine parvovirus: interaction between passive immunity and virulent challenge
L Macartney1, H Thompson, I A McCandlish
1Department of Veterinary Pathology, Glasgow University Veterinary School.
The Veterinary Record
|June 11, 1988
Summary
Passive immunization in puppies delays canine parvovirus (CPV) onset and complicates vaccination. Antibody decline after CPV challenge impacts disease progression and immunization strategies.
Area of Science:
- Veterinary Virology
- Immunology
Background:
- Maternally derived antibodies (MDA) are crucial for protecting puppies from infectious diseases like canine parvovirus (CPV).
- The effectiveness of MDA wanes over time, creating a window of susceptibility that necessitates timely vaccination.
- Understanding antibody dynamics in CPV-challenged puppies is essential for effective disease control and vaccination protocols.
Purpose of the Study:
- To investigate the impact of passive immunization (via hyperimmune serum or MDA) on the clinical course of canine parvovirus infection in puppies.
- To analyze the changes in serum antibody titres following CPV challenge in passively immunized and control groups.
- To evaluate the implications of observed antibody dynamics on disease onset, viral shedding, and vaccination strategies.
Main Methods:
- Two groups of puppies were used: one passively immunized with hyperimmune serum, the other with natural MDA.
- Both groups were orally inoculated with virulent CPV.
- Serum antibody titres were monitored before and after challenge, alongside clinical signs, seroconversion, and viral shedding.
Main Results:
- Serum antibody titres declined more rapidly after CPV challenge in both passively immunized groups compared to controls.
- Puppies in passively immunized groups exhibited delayed onset of clinical signs, seroconversion, and viral shedding.
- A rapid decline in antibody titres post-challenge was observed, potentially due to antibody sequestration by the virus.
Conclusions:
- Passive immunization, whether through hyperimmune serum or MDA, can prolong the incubation period of canine parvovirus disease.
- The rapid decline in antibodies post-challenge complicates accurate infection timing and may interfere with vaccination schedules.
- These findings highlight the need for careful consideration of antibody dynamics in CPV management and immunization programs, especially in high-risk environments.