What to know
- West Nile virus rarely can be spread through blood transfusion.
- The blood supply in the United States is screened for West Nile virus.
Can I get infected with West Nile virus by donating blood?
No. You cannot get infected with West Nile virus by donating blood.
Can I get infected with West Nile virus by receiving a blood transfusion?
Yes, but it is unlikely. A small number of West Nile virus infections have been reported from blood transfusions. However, blood collection agencies have been screening all donated blood for West Nile virus since 2003 to minimize this risk.
Is donated blood tested for West Nile virus?
Yes. All donated blood is tested for West Nile virus. Any blood product found to be infected is removed from the blood supply.
Can I donate blood if I was diagnosed with West Nile virus infection?
If you have been diagnosed with West Nile virus infection or disease (West Nile) by your doctor, you should not donate blood for 120 days. If you are diagnosed shortly after giving blood, you should tell your blood center. Donation centers try to ensure that donors who recently had West Nile virus infections do not give blood for 120 days. Let the center know if you have had a West Nile virus infection. They will help you decide if it is safe for you to donate.
I recently had a transfusion. Should I be concerned about getting infected with West Nile virus?
If you recently had a transfusion, you should be aware of the very small risk for West Nile virus infection. This risk may be higher during the summer when the virus is most likely to infect blood donors. You should contact your doctor if you think you have symptoms caused by West Nile virus or other concerns.