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This is a digitally colorized transmission electron microscopic (TEM) image of Zika virus, which is a member of the family, Flaviviridae. Virus particles, here colored red, are 40nm in diameter, with an outer envelope, and an inner dense core.

Photo by: U.S. CDC/ Cynthia Goldsmith |  VIRIN: 160101-A-A1901-0001.JPG