; and (II) for activities determined appropriate by the Secretary to improve preparedness and response to protect human health for all populations in any public health emergency determined under subsection (a). (ii) Availability Amounts appropriated to the Public Health Emergency Fund under subparagraph (B) shall remain available for the uses described in this subparagraph so long as any public health emergency is determined under subsection (a) and the determination for any such emergency has not terminated under such subsection. (iii) Authority In expending funds appropriated under subparagraph (B) and carrying out activities under this subparagraph, the Secretary shall have the authority to— (I) transfer funds and enter into contracts; (II) utilize flexible hiring mechanisms, including direct hiring authority and personal service contracts; exemptions from certain administrative restrictions (such as travel, information technology, printing and supplies); motor vehicle authority; and flexible compensation for responders, including overtime and danger pay