SIV Focus On Surveys January 17, 2011 | 9:27 pm EST Comments Print On your farm, have the dynamics of SIV control changed dramatically in the past 2-3 years? No: 100%, Yes 0 % Is Swine Influenza Virus one of the top two animal-health concerns on your farm? Yes 100%, No 0%. When do you focus your attention on fighting SIV? Winter 50%, Fall 50%.