(NEWSER) – First mosquitoes; then sex; now blood transfusions. On Thursday, officials in Brazil announced two cases of patients receiving the rapidly spreading Zika virus through donated blood, Reuters reports. According to the Wall Street Journal, the first case was in March after a patient received a blood transfusion during a liver transplant.

The second case was in April after the patient was shot and needed multiple transfusions. “The capacity of Zika to spread through blood transfusions needs to be evaluated, as well as the blood protection measures that should be adopted based on the new findings,” Brazil's Health Ministry says. A Brazilian infectious disease specialist tells the Journal "there is no reason for panic."

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