Recommendations for Deferral of Donors and Quarantine and Retrieval of Blood and Blood Products in Recent Recipients of Smallpox Vaccine (Vaccinia Virus) and Certain Contacts of Smallpox Vaccine Recipients 1.0.0

This guidance document provides the current recommendations of the Food and Drug Administration (FDA) for assessment of donor suitability and quarantine and retrieval of blood and blood products in cases of donors exposed to vaccinia virus, which is the virus used in smallpox vaccines. The presence of vaccinia virus in transfused blood or plasma could be harmful to some recipients. Although the presence of vaccinia virus in blood (viremia) has rarely been documented, this possibility has not been assessed using modern laboratory techniques. Therefore, the risk of transmission of vaccinia virus by blood and blood products is uncertain.