Pandemic and All-Hazards Preparedness Act (P.L. 109-417): Provisions and Changes to Preexisting Law [Updated March 12, 2007] [open pdf - 1MB]
From the Summary: "Authorities to direct federal preparedness for and response to public health emergencies are found principally in the Public Health Service Act (PHS Act), and are administered by the Secretary of Health and Human Services (HHS). Three recent laws provided the core of these authorities. P.L. 106-505, the Public Health Threats and Emergencies Act of 2000 (Title I of the Public Health Improvement Act), established a number of new programs and authorities, including grants to states to build public health preparedness. P.L. 107-188, the Public Health Security and Bioterrorism Preparedness and Response Act of 2002, was passed in the aftermath of the 2001 terror attacks. It reauthorized several existing programs and established new ones, including grants to states to build hospital and health system preparedness. P.L. 108-276, the Project BioShield Act of 2004, established authorities to encourage the development of specific countermeasures (such as drugs and vaccines for bioterrorism agents) that would not otherwise have a commercial market."
CRS Report for Congress, RL33589
Congressional Research Service: https://crsreports.congress.gov/