Researchers now believe that familial or casual contact along with a high viral load are likely responsible for a case of Zika virus contracted by a 38-year-old Utah man. He had been caring for a 73-year-old relative who is believed to have contracted Zika while traveling. The older man had a viral load that was approximately 100,000 times greater than seen in other patients. New information is detailed in the journal Emerging Infectious Diseases.
Case report raises concerns about Zika transmission
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