title: Evidence of leptospirosis in the kidneys and serum of feral swine (Sus scrofa) in the United States.
abstract: Leptospirosis is the most widespread zoonosis in humans worldwide. In the United States, widespread detection of antibodies to leptospirosis have been identified in feral swine (Sus scrofa) with the highest detection of serovars, Bratislava, Icterohaemorrhagiae, and Pomona. Over the past few years, feral swine populations have expanded their geographical range and distribution in the United States with reports in at least 39 of 50 states. Since feral swine serve as reservoirs for serovars that can infect humans, it is important to understand the risk of transmission. In order to learn more about the probability that feral swine shed infectious leptospires, we collected kidneys and paired serum when possible from 677 feral swine in 124 counties of 29 states. These counties had previously been identified as antibody positive for Leptospira interrogans serovars Bratislava, Canicola, Grippotyphosa, Hardjo, Icterohaemorrhagiae or Pomona. Although exposure to these same six serovars of leptospirosis continued to be high (53% overall) in the counties we sampled, we detected leptospiral DNA in only 3·4% of feral swine kidneys tested. Based on these results, it appears that although feral swine can serve as a source of infection to humans, especially in those who are more likely to encounter them directly such as wildlife biologists, veterinarians, and hunters, the risk may be relatively low. However, further studies to examine the relationship between leptospiral shedding in the urine and kidneys in addition to culturing the organism are recommended in order to better understand the risk associated with feral swine.
authors.affiliation: U.S. Department of Agriculture,Animal and Plant Health Inspection Service,Wildlife Services,Fort Collins,CO,USA.
authors.forename: K
authors.initials: K
authors.lastname: Pedersen
authors.affiliation: Colorado State University,Department of Microbiology, Immunology and Pathology,College of Veterinary Medicine and Biomedical Sciences,Fort Collins,CO,USA.
authors.forename: T D
authors.initials: TD
authors.lastname: Anderson
authors.affiliation: U.S. Department of Agriculture, Animal and Plant Health Inspection Service,Wildlife Services,National Wildlife Research Center,Fort Collins, CO,USA.
authors.forename: S N
authors.initials: SN
authors.lastname: Bevins
authors.affiliation: Colorado State University,Department of Microbiology, Immunology and Pathology,College of Veterinary Medicine and Biomedical Sciences,Fort Collins,CO,USA.
authors.forename: K L
authors.initials: KL
authors.lastname: Pabilonia
authors.affiliation: U.S. Department of Agriculture, Animal and Plant Health Inspection Service,Wildlife Services,Oklahoma City,OK,USA.
authors.forename: P N
authors.initials: PN
authors.lastname: Whitley
authors.affiliation: U.S. Department of Agriculture, Animal and Plant Health Inspection Service,Wildlife Services,Albuquerque,NM,USA.
authors.forename: D R
authors.initials: DR
authors.lastname: Virchow
authors.affiliation: U.S. Department of Agriculture, Animal and Plant Health Inspection Service,Wildlife Services,National Wildlife Research Center,Fort Collins, CO,USA.
authors.forename: T
authors.initials: T
authors.lastname: Gidlewski
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D004269:DNA, Bacterial / Q000032:analysis / Q000302:isolation & purification; D005260:Female; D007668:Kidney / Q000382:microbiology*; D007919:Leptospira / Q000145:classification / Q000302:isolation & purification*; D007922:Leptospirosis / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D008297:Male; D044967:Serum / Q000382:microbiology*; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology* / Q000382:microbiology*; D014481:United States / Q000453:epidemiology
chemical_list: D000907:Antibodies, Bacterial; D004269:DNA, Bacterial
keywords: 
                 Leptospira
              ; 
                 Sus scrofa
              ; Feral swine; kidney; leptospirosis