Pulmonary aspergillosis in horses: 29 cases (1974-1997).

The research examined 29 cases of pulmonary aspergillosis in horses from 1974 to 1997, seeking to identify factors that could help prevent this condition or enable early diagnosis. It found that horses with gastrointestinal issues or respiratory symptoms unresponsive to treatment might be at high risk.

Objective and Methodology of the Study

• The goal of this study was to analyze medical archives and identify factors that can enable veterinarians to prevent or diagnose pulmonary aspergillosis—a fungal infection in horses—early.
• A retrospective approach was employed, examining the medical records of 29 horses which were diagnosed with pulmonary aspergillosis.
• The diagnosis was based on characteristic postmortem findings. The records provided information on the history, clinical signs, disease progression, and post-mortem findings of these cases.

Findings of the Study

• The findings revealed that 25 out of the 29 horses (86.2%) had primary or secondary diseases that caused a loss of integrity in the gastrointestinal (GI) tract.
• Only 4 of these horses had a non-GI tract disorder; and merely one of the four showed clinical signs linked to the respiratory tract.
• Even though significant respiratory disorders were spotted in 22 of the horses (75.9%), an antemortem diagnosis of Aspergillus pneumonia was made in only one and suspected in another one.
• Fungal organisms were histologically detected in tissues other than the lung in 12 of the horses (41.4%).

Recommendations and Conclusions

• The research inferred that horses suffering from enteritis, colitis, typhlitis, or other diseases that compromise the mucosal lining of the GI tract, as well as those exhibiting clinical signs of respiratory illness, particularly ones unresponsive to antimicrobial agents, should be considered high risk for pulmonary aspergillosis.
• Additionally, debilitating diseases causing immunosuppression may also predispose horses to aspergillosis.
• Due to the difficulty in diagnosing invasive pulmonary aspergillosis, clinicians are advised to be vigilant regarding clinical and epidemiologic settings susceptible to this disease development, thereby enhancing the potential for early detection and treatment.