There is established in the Treasury a reserve fund to be known as the “Infectious Diseases Rapid Response Reserve Fund” (the “Reserve Fund”): Provided, That of the funds provided under the heading “CDC-Wide Activities and Program Support” [132 Stat. 3073], $50,000,000, to remain available until expended, shall be available to the Director of the CDC for deposit in the Reserve Fund: Provided further, That amounts in the Reserve Fund shall be for carrying out titles II, III, and XVII of the PHS Act [42 U.S.C. 201 et seq., 241 et seq., 300u et seq.] to prevent, prepare for, or respond to an infectious disease emergency, including, in connection with such activities, to purchase or lease and provide for the insurance of passenger motor vehicles for official use in foreign countries: Provided further