Dogs that develop rabies post-vaccination usually manifest the paralytic subtype

Area of Science:

• Veterinary Neurology
• Infectious Diseases
• Immunology

Background:

• Rabies in dogs commonly presents as encephalitic (furious) or paralytic (dumb) forms, with a 2:1 ratio.
• Previous research on post-vaccination rabies clinical types is limited and geographically restricted.
• Understanding these clinical variations is crucial for rabies control and diagnosis in canines.

Purpose of the Study:

• To investigate the clinical presentation of rabies in vaccinated versus non-vaccinated dogs.
• To explore potential correlations between vaccination status and rabies manifestation type.
• To contribute to understanding the pathogenesis of different rabies forms in dogs.

Main Methods:

• A retrospective study of 36 rabid dogs with known vaccination history at The Queen Saovabha Memorial Institute, Bangkok, Thailand (2002-2008).
• Dogs were classified into encephalitic or paralytic rabies types based on clinical signs.
• Statistical analysis was performed to compare the distribution of clinical types between vaccinated and non-vaccinated groups.

Main Results:

• Non-vaccinated dogs predominantly showed the encephalitic form (16/22, 73%).
• Vaccinated dogs significantly more often presented with the paralytic form (10/14, 71%) compared to non-vaccinated dogs (p=0.016).
• This suggests a significant association between rabies vaccination and the paralytic clinical presentation in dogs.

Conclusions:

• Canine rabies vaccination may influence the clinical manifestation towards the paralytic form.
• A partial immune response in vaccinated dogs could modulate disease progression and presentation.
• These findings offer insights into the differential pathogenesis of encephalitic and paralytic rabies.