Rhodococcus equi infection in foals: the science of 'rattles'.
Authors: Muscatello G, Leadon D P, Klayt M, Ocampo-Sosa A, Lewis D A, Fogarty U, Buckley T, Gilkerson J R, Meijer W G, Vazquez-Boland J A
Journal: Equine veterinary journal
Summary
# Rhodococcus equi infection in foals: the science of 'rattles' Rhodococcus equi causes the suppurative airway disease commonly known as 'rattles' in foals, representing a globally significant threat characterised by lung abscesses and bronchitis that frequently goes undiagnosed until clinical signs are advanced. This 2007 review synthesises current understanding of the organism's virulence mechanisms, epidemiology, transmission routes and the immune responses it provokes, drawing on newly available genomic data to explain why infection remains so problematic despite decades of recognition. Key findings reveal that R. equi employs sophisticated pathogenic strategies at the bacterial level, whilst environmental and management factors on breeding farms create ideal conditions for widespread transmission amongst young stock. Genomic insights offer genuine potential for rational vaccine development and targeted farm protocols, though the authors emphasise that vaccination programmes alone will disappoint without concurrent improvements to on-farm management and environmental controls that reduce disease challenge. For practitioners involved in foal health and stud farm management, this work underscores that combating 'rattles' demands a multifaceted approach addressing both the organism's biological mechanisms and the farm practices that enable it—neither element can succeed in isolation.
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Practical Takeaways
- •Recognize 'rattles' as a serious and often terminal condition; early detection through awareness of respiratory signs is critical as manifestations are advanced at clinical presentation
- •Implement comprehensive farm management practices alongside any vaccination program—management control strategies are essential to reduce disease challenge on stud farms
- •Stay informed on emerging genomic knowledge of R. equi virulence factors as this may lead to improved vaccines and management protocols in the future
Key Findings
- •R. equi infection in foals presents primarily as pulmonary abscessation and bronchitis with characteristic clinical signs ('rattles') that are frequently terminal when first identified
- •Understanding of R. equi virulence mechanisms and biology has been enhanced through genome sequencing, providing foundation for rational vaccine development
- •Vaccines alone are unlikely to be effective without concurrent farm management strategies to control on-farm challenge