This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Swine virus.svg ValidSVG Illustration of antigenic shift AntigenicShiftHiRes UTC AntigenicShiftHiRes National Institute of Allergy and Infectious Diseases NIAID Original uploader was Zedla at org en Converted to by Fvasconcellos derivative work Yug talk Swine influenza symptoms on swine svg Crop and edits Yug AntigenicShiftHiRes