Summary:
USDA’s Animal and Plant Health Inspection Service is making updates to its regulations in order to clarify a few points about how expiration dates on veterinary biologics should be calculated and confirmed.https://www.federalregister.gov/documents/2018/03/14/2018-05143/viruses-serums-toxins-and-analogous-products-expiration-date-required-for-serial-and-subserials-and
Source: U.S. Department of Agriculture Animal and Plant Health Inspection Service