Amendment 3 is being issued to amend the timeline for Phase I. The new ship date for the assays is March 31, 2025 with a delivery date of April 1, 2025. The due date for results is April 15, 2025. Additional information will be provided in the packages to answer any lingering questions.

The objective of this contract is to support the Influenza Division through the testing of human sera via hemagglutination inhibition assay as well as develop a new serology platform that is comparable to hemagglutination inhibition assay.

The steps in Phase I are as follows:

1. 1. Letter of Interest – offerors shall email POC information to Contracting Officer
   2. Proficiency panel will be sent by CDC to intersted offerors
   3. Vendor shall email results to CDC Contracting Officer
   4. CDC Contractng Officer will notify each offeror of their pass/fail status for Phase I and if they are then able to proceed to Phase II