A total of 386 presumptively viremic blood donors (PVD) have been reported to CDC's Arbonet surveillance program through state and local health departments as of November 29, 2005. A PVD is a person who was asymptomatic at the time of donating blood (people with symptoms are deferred from donating through a blood collection agency), but whose blood tested positive in preliminary tests when screened for the presence of West Nile virus. PVDs are followed up by the blood agency to verify their infection with additional tests. Some PVDs do go on to develop symptoms after donation, at which point they would be included in the count of human disease cases by their state.Click for more information on blood screening.
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