#COVID_19 Immunity and Compensation under PREP Act Fed. Reg. notice March 17 retroactive effective date Feb. 4, 2020 through Oct. 1, 2024. https://federalregister.gov/documents/2020/03/17/2020-05484/declaration-under-the-public-readiness-and-emergency-preparedness-act-for-medical-countermeasures