Public Health and Social Services Emergency Fund (Including Transfer of Funds) For an additional amount for Public Health and Social Services Emergency Fund , $3,100,000,000, to remain available until September 30, 2024, to prevent, prepare for, and respond to coronavirus, domestically or internationally, including the development of necessary countermeasures and vaccines, prioritizing platform-based technologies with U.S.-based manufacturing capabilities, and the purchase of vaccines, therapeutics, diagnostics, necessary medical supplies, medical surge capacity, and related administrative activities: Provided , That such funds may be used to develop and demonstrate innovations and enhancements to manufacturing platforms to support such capabilities: Provided further , That the Secretary of Health and Human Services shall purchase vaccines developed using funds made available under this heading in this Act to respond to an outbreak or pandemic related to coronavirus in quantities determined by the Secretary to be adequate to address the public health need: Provided further , That products purchased by the Federal government with funds made available under this heading, including vaccines, therapeutics, and diagnostics, shall be purchased in accordance with Federal Acquisition Regulation guidance on fair and reasonable pricing: Provided further , That the Secretary may take such measures authorized under current law to ensure that vaccines, therapeutics, and diagnostics developed from funds provided in this Act will be affordable in the commercial market: Provided further , That in carrying out the previous proviso, the Secretary shall not take actions that delay the development of such products: Provided further , That products purchased with funds appropriated in this paragraph may, at the discretion of the Secretary of Health and Human Services, be deposited in the Strategic National Stockpile under section 319F–2 of the Public Health Service Act: Provided further , That funds appropriated under this heading