Submitted to: International Virtual Conference on Infectious Diseases of Animals
Publication Type: Abstract Only
Publication Acceptance Date: 5/2/1997
Publication Date: N/A
Technical Abstract: The USDA:APHIS:Veterinary Service conducted a study of the health and management of grower/finisher swine as part of the National Animal Health Monitoring System's (NAHMS) Swine 95 Survey. A stratified random sample of producers from the 16 major swine producing states was selected for the study. Of the 418 farms participating in the 95 study, 152 farms participated in the fecal collection for Salmonella. From each farm, a maximum of 50 fresh fecal samples were collected from the floor of pens containing late finisher pigs with a maximum number of 10 pens per farm sampled. A total of 6,655 samples were cultured for Salmonella. The sample and herd prevalence rates were 6.0% (398/6,655 positive) and 38.2% (58/152 positive), respectively. The number of serotypes recovered from the positive farms ranged from one to six (one serotype per farm was recovered from 35 farms). The ten most common serotypes recovered were S. derby (32.3%), S. agona (13.0%), S. typhimurium (copenhagen) (11.3%), S. brandenburg (7.7%), S. mbandaka (7.7%), S. typhimurium (3.6%), S. heidelberg (3.6%), S. anatum (1.9%), S. enteritidis PT13A (1.7%), and S. worthington (1.7%). Among the positive farms (n=58), 15.8% were positive for S. derby while 6.6% were positive for S. agona. Only one serogroup was recovered from 39 (67.2%) of the farms. The most common serogroup recovered was B (72.7%) followed by C1 (11.1%). Recovery from all other serogroups was less than 5%. The frequency of any farm positive for a specific serogroup indicated that the likelihood of recovering an isolate belonging to serogroup B was the greatest (81.0%) followed by C1 (17.2%), G2 (12.1%), and D1 (6.9%). Untypable, O group 16, or nonmotile isolates were recovered from 22.4% of the herds.