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The department said earlier this month it was looking into vaccines as an option to protect poultry against deadly bird flu as the country faces its worst outbreak since 2015. The current outbreak has wiped out well over twenty million chickens and turkeys in commercial flocks since February.
“Samples from the Pennsylvania flock were tested at the Pennsylvania Veterinary Laboratory and samples from the Utah flock were tested at the Utah Veterinary Diagnostic Laboratory, both part of the National Animal Health Laboratory Network,” the USDA said in a statement on Saturday.
Federal and state officials were working jointly on additional surveillance and testing in areas around affected flocks, the USDA said.
The recent highly pathogenic avian influenza (HPAI) cases do not present an immediate public health concern, U.S. authorities said.
Previously, the United States has eschewed vaccines, worried that importers will ban U.S. poultry shipments because they cannot distinguish infected birds from vaccinated ones. The United States is the world’s second-largest poultry meat exporter. In 2020, the value of U.S. poultry and poultry product exports to the world reached $4.2 billion.
Bird flu has hit poultry in Europe and Asia in addition to North America, and the USDA is working with other countries on options for vaccines.
Trading has suffered, as importers like China have blocked imports from many U.S. states with outbreaks.
By Kanishka Singh