Final answer:
Tracking avian flu outbreaks and doing surveillance in the United States is the activity that is most likely to be implemented by the public health department based on the mission of public health.
Step-by-step explanation:
The activity that is most likely to be implemented by the public health department when planning its health programming, based on the mission of public health as described by the Institute of Medicine, is tracking avian flu outbreaks and doing surveillance in the United States. This aligns with the goal of preventing and managing diseases that threaten human health, as well as the CDC's role in monitoring and protecting the public from disease and injury. Providing a flu shot for an elderly person at the health department is an example of healthcare service delivery and does not necessarily involve the broader public health focus. Keeping track of alternative therapies or keeping snake antivenom at the CDC in Atlanta are more specific activities related to specific diseases or conditions, rather than the broader mission of public health.