At least some of the testing follows suspicion of infection.

Voluntary Testing of Cattle

While interstate movement testing of lactating dairy cattle is required per the Federal Order, producers and veterinarians may choose to conduct additional testing to manage HPAI suspect or affected herds to better protect their herds. If this testing is performed at NAHLN laboratories, APHIS will support the testing costs provided they obtain a FAD number (for sick cattle) or include a premises ID and follow the testing guidance below. APHIS will reimburse for Influenza testing at NAHLN laboratories associated with this event for the following submission reasons:

• Suspect cattle
• Apparently healthy cattle that have been exposed to or epidemiologically linked to suspect or confirmed positive HPAI cattle
• Cattle from producers concerned their cattle may have HPAI
• Sick or dead domestic animals near affected premises
• Wildlife (reason for submission must indicate emerging event)
• Monitoring of healthy cattle via bulk tank samples (approved participation per protocol specified below)

— Testing Guidance for Influenza A in Livestock