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Volume 21, Number 10—October 2015

Influenza Virus Surveillance in Coordinated Swine Production Systems, United States

Bryan Kaplan, Jennifer DeBeauchamp, Evelyn Stigger-Rosser, John Franks, Jeri Carol Crumpton, Jasmine Turner, Daniel Darnell, Trushar Jeevan, Myoung-don Oh, Abbey Harding, Richard Webby, and James F. LoweComments to Author 
Author affiliations: St. Jude Children’s Research Hospital, Memphis, Tennessee, USA (B.S. Kaplan, J. DeBeauchamp, E. Stigger-Rosser, J. Franks, J.C. Crumpton, J. Turner, D. Darnell, T. Jeevan, G. Kayali, R.J. Webby); Lowe Consulting Ltd., Albers, Illinois, USA (A. Harding, J.F. Lowe); University of Illinois College of Veterinary Medicine, Urbana, Illinois, USA (J.F. Lowe).

Main Article

Table 1

Epidemiologic data for influenza A virus among swine in coordinated swine production systems, United States, September 2012–September 2013*

Variable No. samples No. (%) positive samples p value
Georgia 2,520 73 (2.9)
Illinois 4,490 408 (9.1) <0.001
Nebraska 3,894 126 (3.2)
134 (3.3)

Age group
Gilt 8,028 375 (4.7) 0.85
366 (5.3)

Farm type
MF, gilts† 1,526 67 (4.4)
MF, piglets 1,559 72 (4.6)
GDU 1,455 115 (7.9) <0.001
487 (4.7)

1 3,673 142 (3.9)
2 3,337 339 (10.2) <0.001
3 4,050 134 (3.3)
4 3,894 126 (3.2)

*Piglets were sampled before weaning; gilts were sampled at entry to MFs and before moving from GDUs to BTWs. MF, multiplier farm; GDU, gilt development unit; BTW, breed-to-wean.

Main Article

Page created: September 23, 2015
Page updated: September 23, 2015
Page reviewed: September 23, 2015
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.