A transmission electron microscope image shows a negative-stained, Fortaleza-strain Zika virus (red) isolated from a microcephaly case in Brazil. The Walter Reed Army Institute of Research is developing a vaccine against the Zika virus in coordination with federal partners, including the Biomedical Advanced Research and Development Authority of the Department of Health and Human Services and the National Institutes of Health's National Institute of Allergy and Infectious Diseases. National Institutes of Health photo