What was one of the major challenges for the response to the 2015 HPAI outbreak in the United States?

• A. Depopulation of large numbers of laying hens in cages and cleanup exceeded the capabilities of the responders.
• B. The carrier state of the disease in the wild waterfowl; surveillance efforts could not detect and keep up with the movement of the virus via the waterfowl.
• C. Because of the high risk for human infections, responders had to be put on prophylactic antivirals before they could help, this delayed the response time.
• D. The wide geographic distribution of the outbreak and coordination or teams across the country.

Answer: (A)

The key idea is the scale of the response and the resources needed to handle it. In 2015, the HPAI outbreak required depopulating millions of birds across many facilities, plus the huge task of cleaning and disposing of carcasses and decontaminating sites. That surge in culling, waste handling, and site cleanup overwhelmed available manpower, equipment, and time, making it the most challenging aspect of the response.

Other factors like wild birds spreading the virus, the need for antiviral prophylaxis for responders, or coordinating teams nationwide were real concerns, but the dominant bottleneck highlighted by responders was the sheer workload and capacity required for depopulation and environmental cleanup.