Highly Pathogenic Avian Influenza Virus: An Update on H5N1 in Mammals

Bird Flu Hits More Than Birds

Massive Impact on Dairy

Since early 2024, there have been 977 detections in dairy cows across 17 states. In California, 70% of herds were affected, and milk production dropped by 9.3%.

One study found losses of $950 per affected cow, totaling over $737,000 per herd during the outbreak period. Impacts on production are long-lasting.

Scientists found the PB2 E627K mutation in TX cow herds—linked to increased mammal-to-mammal transmission and found in the first human case in 2024.

Organic farmers lack consistent info to guide decisions. If you suspect avian flu symptoms in your animals, call the OFA Farmer HelpLine: for confidential help.

Highly Pathogenic Avian Influenza Virus: An Update on H5N1 in Mammals

Bird Flu Hits More Than Birds

Since 2022, deadly outbreaks of influenza A(H5), including H5N1, have been reported in mammals—farmed fur animals, seals, sea lions, foxes, bears, raccoons, cats, dogs, cows, goats & more.

H5N1 in dairy cows is transmitted through milk, contact between cows, and milking equipment—and to humans who work closely with cows.

Massive Impact on Dairy

One study found losses of $950 per affected cow, totaling over $737,000 per herd during the outbreak period. Impacts on production are long-lasting.

Scientists found the PB2 E627K mutation in TX cow herds—linked to increased mammal-to-mammal transmission and found in the first human case in 2024.

Organic farmers lack consistent info to guide decisions. If you suspect avian flu symptoms in your animals, call the OFA Farmer HelpLine: for confidential help.

833-724-3834

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