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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Add legends. The original can be viewed here: Swine virus.svg: . Modifications made by Yug.

	This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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Original upload log

This image is a derivative work of the following images:

• File:Swine_virus.svg licensed with PD-USGov
  • 2009-05-01T18:09:31Z Yug 1500x1000 (1391601 Bytes) white background (2try), smaller virus.
  • 2009-05-01T18:07:30Z Yug 1500x1000 (1391280 Bytes) white backgroung, smaller virus.
  • 2009-05-01T17:51:16Z Yug 1522x1013 (1392119 Bytes) {{Information |Description={{en|Illustration of [[:en:antigenic shift|antigenic shift]]}} |Source=*[[:File:AntigenicShift_HiRes.png|]] |Date=2009-05-01 18:50 (UTC) |Author=*[[:File:AntigenicShift_HiRes.png|]]: [[:en:National

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