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No IgM antibodies against West Nile virus were detected. IgM a blood antibody test is used to detect recent or active infection because IgM appears within days of infection and declines after 1-2 months. IgG testing can differentiate past vaccination from natural infection.
No IgM antibodies against West Nile virus were detected. IgM a blood antibody test is used to detect recent or active infection because IgM appears within days of infection and declines after 1-2 months. IgG testing can differentiate past vaccination from natural infection.
No action needed. Continue annual WNV vaccination. Vector control (eliminating standing water, using insect repellents, and stabling during dawn/dusk) reduces risk.
Equine WNV serology: NEGATIVE (0)IgM antibodies against West Nile virus were detected, indicating recent infection or vaccination. If the horse is unvaccinated, this confirms acute WNV infection. WNV is a mosquito-borne flavivirus that causes neurologic disease in horses. Clinical signs range from mild ataxia and muscle fasciculations (which often look like the horse is 'twitching' or 'trembling') to recumbency, seizures, and death. Approximately 30-40% of horses showing clinical signs die or are euthanized.
If your horse shows any neurologic signs (incoordination, weakness, muscle twitching, difficulty rising), this is a veterinary emergency. Supportive care includes anti-inflammatory drugs (flunixin meglumine), IV fluids, and nursing care (sling support, assisted feeding). Affected horses that survive typically recover over weeks to months. Vaccination is highly effective for prevention. Mosquito control is critical.
Equine WNV serology: POSITIVE IgM (1)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.