A Wolf at the Door: Rocky Mountain Spotted Fever in the Americas

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"A wolf at the door" – that's how researchers describe the growing threat of Rocky Mountain Spotted Fever (RMSF), a potentially deadly tick-borne disease that's increasingly prevalent across the Americas. In this eye-opening conversation, Drs. Janet Foley and Andres Lopez-Perez challenge common misconceptions about this dangerous pathogen.

Did you know the brown dog tick – a primary vector for RMSF – thrives in urban environments rather than wilderness areas? This tick commonly infests homes, yards, and kennels, putting dogs and their human families at risk even in cities and towns. Drs. Foley and Lopez-Perez emphasize that veterinarians serve as crucial frontline defenders through early detection and treatment, potentially saving both canine and human lives.

Time is the enemy with RMSF. Each 2-3 day delay in starting doxycycline treatment doubles or triples the risk of death. While case fatality rates vary dramatically between regions, Drs. Foley and Lopez-Perez attribute these differences primarily to healthcare access and speed of diagnosis rather than bacterial strain differences. Their international collaborations reveal how the same disease manifests differently across various ecological settings from Brazil to Mexico to the United States yet shares common challenges requiring coordinated One Health solutions.

For veterinarians, the key takeaway is maintaining a high index of suspicion for RMSF in endemic areas, even when symptoms initially appear vague. Despite today's focus on antimicrobial stewardship, the hosts emphasize that appropriate doxycycline use for suspected RMSF represents good medicine given the disease's potential lethality. Through greater awareness, timely intervention, and collaborative approaches across medical disciplines, we can better protect both animal and human health from this serious emerging threat.

Listen now to understand the evolving ecology of this disease, learn practical approaches to diagnosis and prevention, and discover how your veterinary practice can play a vital role in addressing this significant One Health challenge.

AJVR article: https://doi.org/10.2460/ajvr.24.11.0368

JAVMA article: https://doi.org/10.2460/javma.24.11.0756

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