Seroprevalence and Risk Factor Analysis of Swine TTSuV Infection in Sichuan and Chongqing

Seroprevalence of swine Torque Teno sus virus (T TSuV ) infection and risk factor analysis in Chongqing and Sichuan were performed with the methods of ELISA and case‐control study .A total of 1 , 918 swine serum samples were obtained from 23 counties with different topographic conditions and differ‐ent breeds style distributed in 2 provinces .All sera were tested for TTSuV antibodies by TTSuV‐IgG‐ELISA kit .Antibodies to TTSuV were detected in 341 (17.78% ) of 1 ,918 pigs sera ,and the prevalence of TTSuV infection were15.98% (171/1070) and 20.05% (170/848) in Sichuan and Chongqing ,respectively , of which the prevalence of TTSuV infection was 32.5% ,31.4% ,19.6% and 11.2% in boars ,sows ,fin‐ishing pigs and piglets ,respectively .A case‐control study carried‐out to identify herd level risk factors for TTSuV antibodies in pigs showed no significant association between the geographical location (mountain and hill areas) and seroprevalence of swine T TSuV infection (OR=1.08 ,95% CI=0.49-1.58) ,and be‐tween the breeds style and seroprevalence (OR=1.04 ,95% CI=1.01-1.47) ,respectively .The risk of T TSuV infection significantly increased in adult animals vs. piglets (boars OR=3.8 ,95% CI=1.878 -7.752 ;and sows OR=3.6 ,95% CI=2.153 -6.110) and finishing pigs (OR=1.9 ,95% CI=1.443 -2.586) ,as well as in boars and sows vs. finishing pigs (boars:OR=2.0 ,95% CI=1.004-3.887 ;sows :OR=1.9 ,95% CI=1.165-3.026) ,respectively .The above results demonstrated that swine TTSuV in‐fection w as present in Sichuan and Chongqing and that the age of the animal appeared to be the major risk factors of prevalence of swine T TSuV infection .