The Centers for Disease Control and prevention intends to award a sole source firm fixed price purchase order to The Jackson Laboratory for Mice. There is no other source of high level human cell engrafted mice that can faithfully reproduce the disease observed in human cases of Ebola, Crimean-Congo hemorrhagic fever or Lassa hemorrhagic fever as has been experimentally proven by researchers at the Viral Special Pathogens Branch (VSPB). This contract action is for services for which the Government intends to solicit and negotiate with only one source under the authority of 13.106-1(b) (SAP) and 10 U.S.C. 2304(c)(1). Interested persons may identify their interest and capability to respond to the requirement or submit proposals.