NAVLE Respiratory

Canine Infectious Respiratory Disease Complex Study Guide

Canine Infectious Respiratory Disease Complex (CIRDC), commonly referred to as "kennel cough," is a highly contagious syndrome affecting the respiratory tract of dogs worldwide.

Overview and Clinical Importance

Canine Infectious Respiratory Disease Complex (CIRDC), commonly referred to as "kennel cough," is a highly contagious syndrome affecting the respiratory tract of dogs worldwide. This multifactorial disease involves multiple bacterial and viral pathogens, often occurring as coinfections. Understanding CIRDC is essential for NAVLE success, as questions frequently address etiology, clinical presentation, diagnosis, treatment, and prevention.

CIRDC is of particular concern in environments where dogs are housed together, including animal shelters, boarding facilities, daycare centers, veterinary hospitals, and dog shows. The disease is characterized by acute onset of contagious respiratory signs, with clinical presentation ranging from mild, self-limiting illness to severe bronchopneumonia requiring hospitalization.

High-YieldCIRDC is the classic board question topic for infectious respiratory disease. Remember: multiple pathogens acting sequentially or synergistically, coinfections are common (present in up to 60% of cases), and the characteristic "honking" cough is pathognomonic for the syndrome but not for any specific pathogen.
Pathogen Type Primary Role Vaccine Available
Bordetella bronchiseptica Gram-negative bacteria Primary or secondary pathogen Yes (IN, oral, SQ)
Canine Parainfluenza Virus (CPiV) Paramyxovirus (RNA) Primary pathogen Yes (DA2PP, IN)
Canine Adenovirus Type 2 (CAV-2) Adenovirus (DNA) Primary pathogen Yes (DA2PP)
Canine Influenza Virus (H3N8) Orthomyxovirus (RNA) Primary pathogen Yes (killed)
Canine Influenza Virus (H3N2) Orthomyxovirus (RNA) Primary pathogen Yes (killed)
Canine Distemper Virus (CDV) Morbillivirus (RNA) Primary pathogen (multisystemic) Yes (DA2PP) - CORE
Mycoplasma cynos Mollicute (no cell wall) Primary or secondary No
Canine Respiratory Coronavirus (CRCoV) Betacoronavirus (RNA) Primary or facilitating No
Streptococcus equi zooepidemicus Gram-positive bacteria Opportunistic (can be fatal) No

Etiology and Pathogenesis

CIRDC results from infection with one or more pathogens. The traditional "big three" pathogens are Bordetella bronchiseptica, Canine Parainfluenza Virus (CPiV), and Canine Adenovirus Type 2 (CAV-2). However, numerous emerging pathogens have been identified as significant contributors to disease.

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