Viruses, Volume 4 (2012)
- Issue 1 (January 2012), Pages 1-199
- Issue 2 (February 2012), Pages 200-324
- Issue 3 (March 2012), Pages 325-423
- Issue 4 (April 2012), Pages 424-653
- Issue 5 (May 2012), Pages 654-923
- Issue 6 (June 2012), Pages 924-1033
- Issue 7 (July 2012), Pages 1034-1181
- Issue 8 (August 2012), Pages 1182-1371
- Issue 9 (September 2012), Pages 1372-1843
- Issue 10 (October 2012), Pages 1844-2416
- Issue 11 (November 2012), Pages 2417-3269
- Issue 12 (December 2012), Pages 3270-3952