Bird flu is slamming a big part of California’s agriculture economy.

State officials on Friday said two-thirds of its dairies are now under quarantine due to the infection.

California is the nation’s largest dairy producer with more than 980 dairies.

Farmers are frustrated because bird flu seems to be spreading rapidly despite precautions.

Some evidence suggests contaminated equipment and people who work at multiple farms can spread the virus. But the state’s veterinarian says there’s more at play that’s causing the spread.

Sick cows generally recover and start producing milk again, though sometimes they don’t reach the same level of output.

Still, the disease isn’t expected to impact milk supply significantly.

California Governor Gavin Newsom declared a state of emergency Wednesday to help agencies address the problem.

Poultry farms have been hit by the virus as well. More than 50 California farms tested positive this fall.

In those cases of poultry farms, all the birds in an affected flock have to be euthanized to prevent virus spread.

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