The American Red Cross has appealed to prospective blood donors who have travelled to Zika virus outbreak areas to wait at least 28 days before donating their blood.
The "self-deferral" for blood donors should apply to those who have visited Mexico, the Caribbean, or Central or South America during the past four weeks, the Red Cross said in a statement.
The Zika outbreak, a mosquito-born illness linked to a dangerous birth defect called microcephaly, now affects more than 30 countries and territories.
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