What Is the Homeland Security Presidential Directive-21: Public Health and Medical

What is the Homeland Security Presidential Directive-21: Public Health and Medical Preparedness?

A) This was aimed at addressing the ability of the U.S. public health system to provide mass casualty care following any significant terrorist attack, whether related to weapons of mass destruction or not.
B) It deals with the ability of U.S. authorities to control the possession, storage, and spread of dangerous pathogens. The Department of Health and Human Services (HHS) is required to maintain a list of select agents that pose a threat to public health and safety.
C) It is aimed at the need to develop and stockpile medical countermeasures necessary to treat victims of chemical, biological, radiological, nuclear, and explosive agents.
D) It was designed to provide market incentives to pharmaceutical and other biotechnology companies to engage in vaccine research and to ensure a market for new vaccines by providing for government purchase. It also provided for expedited funding and approval procedures.