Chronic pulmonary disease with radiographic interstitial opacity (interstitial pneumonia) in foals.
Authors: Nout Y S, Hinchcliff K W, Samii V F, Kohn C W, Jose-Cunilleras E, Reed S M
Journal: Equine veterinary journal
Summary
# Editorial Summary: Chronic Interstitial Pneumonia in Foals Between 1995 and 2000, researchers at Ohio State University identified 12 foals (aged 3–9 months) presenting with chronic pulmonary disease characterised by marked interstitial opacity on thoracic radiographs, distinguishing this condition from typical bacterial pneumonia through a constellation of clinical features: prolonged respiratory signs lasting 1–3 months, consistent clinical disease severity, and notably, failure to isolate a consistent pathogen from tracheobronchial aspirates. The diagnostic approach centred on radiographic confirmation of the interstitial pattern rather than microbiological identification, reflecting the suspected inflammatory or immune-mediated aetiology underlying this syndrome. All foals were managed with broad-spectrum antimicrobial therapy combined with corticosteroid treatment, resulting in 100% survival to discharge and complete clinical recovery in all 10 foals available for long-term follow-up (ranging 5 months to 5 years post-discharge). These findings suggest that chronic interstitial pneumonia carries a substantially better prognosis than acute pneumonic disease in foals and indicates that corticosteroids warrant consideration in the treatment protocol when this radiographic pattern is identified. Practitioners encountering young foals with prolonged, severe respiratory signs and negative culture results should consider interstitial pneumonia in the differential diagnosis and may justify early corticosteroid intervention alongside antimicrobial cover.
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Practical Takeaways
- •Chronic interstitial pneumonia in foals carries a favorable prognosis with appropriate treatment including corticosteroids and antimicrobials, even when specific pathogens cannot be identified
- •Absence of positive culture from tracheobronchial aspirates does not rule out significant respiratory disease in foals; radiographic interstitial patterns warrant treatment trials
- •Corticosteroid therapy appears beneficial in managing chronic interstitial pneumonia in foals and should be considered as part of treatment protocols
Key Findings
- •Twelve foals aged 3-9 months presented with 1-3 months duration of respiratory disease with marked interstitial opacity on thoracic radiographs
- •Consistent pathogenic organisms were not isolated from tracheobronchial aspirates in any of the cases
- •All 12 foals treated with broad-spectrum antimicrobials and corticosteroids were discharged alive
- •Of 10 foals available for follow-up (5 months to 5 years post-discharge), all were disease-free and performing to expectation