Rabies Virus in Raccoons, Ohio, 2004
Author Information
Author(s): Henderson J. Caroline, Biek Roman, Hanlon Cathleen A., O'Dee Scott, Real Leslie A.
Primary Institution: Centers for Disease Control and Prevention
Hypothesis
The outbreak of the raccoon rabies virus variant in Ohio may have begun several years before 2004 and may have originated within the vaccination zone.
Conclusion
The study suggests that the rabies virus had been circulating undetected among raccoons in the oral rabies vaccine zone for several years before its detection in 2004.
Supporting Evidence
- The 2004 outbreak was caused by a distinct RRV lineage that had limited diversity.
- The virus associated with the 2004 outbreak most likely originated within the ORV zone.
- All viruses sampled in the recent Ohio outbreak had started to diversify at least 3 years before 2004.
- Insufficient levels of immunization among the overall population could contribute to the persistence of the virus.
Takeaway
Scientists found that raccoons in Ohio had rabies for years before it was discovered, which means the vaccine might not be enough to stop the spread.
Methodology
Viral RNA was extracted from brain tissue of 67 rabid raccoons, and genetic analyses were performed to understand the outbreak.
Limitations
The level of surveillance needed to detect RRV when transmission frequency is low is unclear.
Participant Demographics
Samples came from raccoons in Ohio and neighboring states.
Digital Object Identifier (DOI)
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