Histopathological Myocardial Changes and CPV-2 DNA Detection in Young Dogs: A Retrospective Study

Area of Science:

• Veterinary Pathology
• Canine Virology
• Cardiovascular Disease

Background:

• Canine parvovirus type 2 (CPV-2) is a major cause of illness and death in young dogs globally.
• While the enteric form of CPV-2 is well-understood, its impact on the heart (myocardium) is less clear.

Purpose of the Study:

• To investigate myocardial lesions in young dogs.
• To determine the association between CPV-2 DNA presence and observed heart lesions using histopathology and PCR on cardiac tissue.

Main Methods:

• Retrospective analysis of 27 young dogs (3-11 months) that underwent necropsy.
• Histopathological examination of heart tissue (H&E staining).
• Conventional PCR for CPV-2 DNA detection in formalin-fixed paraffin-embedded (FFPE) cardiac samples.

Main Results:

• All dogs (100%) exhibited myocardial abnormalities, primarily myocarditis.
• Cardiomyocyte necrosis and fibrosis were found in 33.3% and 51.9% of cases, respectively.
• CPV-2 DNA was detected in 33.3% of myocardial samples, with significantly higher rates of necrosis (77.8%) and fibrosis (100%) in these cases.

Conclusions:

• Detection of CPV-2 DNA in affected heart tissue suggests a potential link between CPV-2 infection and myocardial injury in young dogs.
• The study's retrospective nature and sample size limit definitive conclusions on causality.
• Further research with larger cohorts and advanced techniques is necessary to elucidate the pathogenesis and clinical significance of CPV-2-associated myocardial lesions.