HealthDay News — According to studies published in Transfusion, US blood banks are confident they have the tools to protect America’s blood supply from possible new Zika virus outbreaks during the upcoming mosquito season.

Every blood donation in the United States undergoes testing for the presence of Zika virus, based on guidance from the US Food and Drug Administration, Susan Stramer, PhD, vice president of scientific affairs for the American Red Cross, told HealthDay

About 40 US donations have tested positive for Zika since screening began, mostly in Florida, Stramer said. US blood banks use two tests that look for the genetic material of Zika in samples, Louis Katz, MD, chief medical officer of America’s Blood Centers, told HealthDay. Any donations with potential infection are discarded.

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Blood sample screening in the southern United States last year detected 23 potentially Zika-tainted donations out of 358,786. Fourteen of those samples, all from Florida, were judged as probably infected based on further genetic testing and interviews with donors, according to one of the new studies.

Ten of the 14 donors reported travel to an active Zika transmission area within 90 days before donating blood, researchers reported. Two involved travel within the Miami outbreak area, while the rest involved travel to Puerto Rico, Jamaica, Trinidad, Mexico, Cuba, or the Dominican Republic.

A second study reported detection of five Zika-tainted samples out of 466,834 donations across the entire United States, all linked to travel in Central or South America. The cases occurred in Arizona, California, Nevada, New York, and Texas.

Routine blood processing adds another layer of protection to the blood supply. A third study in the journal reports that Zika is inactivated when plasma is separated from whole blood and undergoes standard pasteurization.


Galel SA, et al. “First Zika-Positive Donations In The Continental United States.” Transfusion. 2017;57(3): 762-769. doi: 10.1111/trf.14029

Williamson PC, et al. “First Cases Of Zika Virus-Infected US Blood Donors Outside States With Areas Of Active Transmission.” Transfusion. 2017;57(3): 770-778. doi: 10.1111/trf.14041

Blümel J, et al. “Inactivation And Removal Of Zika Virus During Manufacture Of Plasma-Derived Medicinal Products.” Transfusion. 2016;57(3): 790-796. doi: 10.1111/trf.13873

Marks PW and Petersen LR. “Decision Making In The Face Of Uncertainty: The Challenge Of Emerging Infectious Diseases.” Transfusion. 2017;57(3): 723-728. doi: 10.1111/trf.14037

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