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In this photo provided by the U.S. Department of Agriculture, animal care staff prepare to collect a blood sample from a dairy calf vaccinated against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Wednesday, July 31, 2024. (USDA Agricultural Research Service via AP)

In this photo provided by the U.S. Department of Agriculture, animal care staff prepare to collect a blood sample from a dairy calf vaccinated against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Wednesday, July 31, 2024. (USDA Agricultural Research Service via AP)

Calves stand in a pen at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

Calves stand in a pen at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

Dairy cows stand in a field outside of a milking barn at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

Dairy cows stand in a field outside of a milking barn at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

Vaccinated calves stand in a pen in a large animal containment building at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

Vaccinated calves stand in a pen in a large animal containment building at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

In this photo provided by the U.S. Department of Agriculture, an animal caretaker collects a blood sample from a dairy calf vaccinated against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Wednesday, July 31, 2024. (USDA Agricultural Research Service via AP)

In this photo provided by the U.S. Department of Agriculture, an animal caretaker collects a blood sample from a dairy calf vaccinated against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Wednesday, July 31, 2024. (USDA Agricultural Research Service via AP)

Amy Baker speaks in a lab at the National Animal Disease Center in Ames, Iowa, on Wednesday, Aug. 7, 2024. In addition to vaccines, she and other researchers also have been working on studies in which they try to see how the virus spreads between cows. (AP Photo/Charlie Neibergall)

Amy Baker speaks in a lab at the National Animal Disease Center in Ames, Iowa, on Wednesday, Aug. 7, 2024. In addition to vaccines, she and other researchers also have been working on studies in which they try to see how the virus spreads between cows. (AP Photo/Charlie Neibergall)

In this photo provided by the U.S. Department of Agriculture, a dairy cow is milked before inoculation against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Friday, July 19, 2024. (USDA Agricultural Research Service via AP)

In this photo provided by the U.S. Department of Agriculture, a dairy cow is milked before inoculation against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Friday, July 19, 2024. (USDA Agricultural Research Service via AP)

A high-containment laboratory building is seen at the National Animal Disease Center in Ames, Iowa, on Wednesday, Aug. 7, 2024. (AP Photo/Charlie Neibergall)

A high-containment laboratory building is seen at the National Animal Disease Center in Ames, Iowa, on Wednesday, Aug. 7, 2024. (AP Photo/Charlie Neibergall)

A large animal containment building is seen on the campus of the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

A large animal containment building is seen on the campus of the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

Dairy cows stand in a field outside of a milking barn at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

Dairy cows stand in a field outside of a milking barn at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

In this photo provided by the U.S. Department of Agriculture, a researcher performs a rapid antigen test on milk from a dairy cow inoculated against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Monday, July 29, 2024. (USDA Agricultural Research Service via AP)

In this photo provided by the U.S. Department of Agriculture, a researcher performs a rapid antigen test on milk from a dairy cow inoculated against bird flu in a containment building at the National Animal Disease Center research facility in Ames, Iowa, on Monday, July 29, 2024. (USDA Agricultural Research Service via AP)

A cow stands in a feeding pen at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

A cow stands in a feeding pen at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

A sign stands outside of the National Centers for Animal Health campus, Tuesday, Aug. 6, 2024, in Ames, Iowa. (AP Photo/Charlie Neibergall)

A sign stands outside of the National Centers for Animal Health campus, Tuesday, Aug. 6, 2024, in Ames, Iowa. (AP Photo/Charlie Neibergall)

Dairy cows stand in a field outside of a milking barn at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

Dairy cows stand in a field outside of a milking barn at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

A cow stands in a field at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)

A cow stands in a field at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames, Iowa, on Tuesday, Aug. 6, 2024. (AP Photo/Charlie Neibergall)