Seroprevalence of Actinobacillus (Haemophilus) pleuropneumoniae serotype-1 infection in swine herds in Quebec

Jean-Pierre Vaillancourt From the Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Vaillancourt), and the Groupe de Recherche sur les Maladies Infectieuses du Porc, College of Veterinary Medicine, University of Montreal, St. Hyacinthe, Quebec, Canada J2S 7C6 (Martineau, Larivière, Higgins, Mittal)

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Guy-Pierre Martineau From the Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Vaillancourt), and the Groupe de Recherche sur les Maladies Infectieuses du Porc, College of Veterinary Medicine, University of Montreal, St. Hyacinthe, Quebec, Canada J2S 7C6 (Martineau, Larivière, Higgins, Mittal)

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Serge Larivière From the Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Vaillancourt), and the Groupe de Recherche sur les Maladies Infectieuses du Porc, College of Veterinary Medicine, University of Montreal, St. Hyacinthe, Quebec, Canada J2S 7C6 (Martineau, Larivière, Higgins, Mittal)

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Robert Higgins From the Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Vaillancourt), and the Groupe de Recherche sur les Maladies Infectieuses du Porc, College of Veterinary Medicine, University of Montreal, St. Hyacinthe, Quebec, Canada J2S 7C6 (Martineau, Larivière, Higgins, Mittal)

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Khyali R. Mittal From the Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Vaillancourt), and the Groupe de Recherche sur les Maladies Infectieuses du Porc, College of Veterinary Medicine, University of Montreal, St. Hyacinthe, Quebec, Canada J2S 7C6 (Martineau, Larivière, Higgins, Mittal)

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Summary

Seroprevalence of Actinobacillus (Haemophilus) pleuropneumoniae serotype-1 infection was evaluated in pigs on 7 farms in Quebec. Commercial cross-bred herds A to G, ranging from 110 to 235 sows and infected with A pleuropneumoniae serotype-1 were selected. Five pigs/litter were selected at random and were identified (group 1). Blood samples were obtained from group-1 pigs at 2 to 4, 14, 28, 42, and 56 days of age. Blood also was obtained from group-1 pigs remaining in the postweaning unit at 70 days of age, and from 20 to 40 sows 1 to 3 times.

To determine prevalence of seropositive pigs in all age groups for the entire study period in herds C to G, blood samples were obtained from 20 pigs/age group (group 2) selected at random at 28, 42, and 56 days of age at each visit. Group-1 pigs were included when they reached 28, 42, and 56 days of age. Pigs were serologically monitored in herds A and B for 3 months and in herds C to G for 5 to 6 months.

Serologic status of pigs at 2 to 4 days of age was not statistically associated with status at 42 days (P = 0.6293) and at 56 days (P = 0.3098) of age for the same pigs. Therefore, seronegative pigs 2 to 4 days old did not seroconvert earlier than did those with detectable maternal antibodies at 2 to 4 days old. Only about 50% of the 70-day-old pigs were seropositive at 56 days. Seemingly, pigs seroconverted late in the postweaning period.

Prevalence of seropositive 42- and 56-day-old pigs varied among and within herds over a short period. The prevalence of A pleuropneumoniae infection in the adult population was not related to the prevalence of the infection in weaned pigs.

Summary

Seroprevalence of Actinobacillus (Haemophilus) pleuropneumoniae serotype-1 infection was evaluated in pigs on 7 farms in Quebec. Commercial cross-bred herds A to G, ranging from 110 to 235 sows and infected with A pleuropneumoniae serotype-1 were selected. Five pigs/litter were selected at random and were identified (group 1). Blood samples were obtained from group-1 pigs at 2 to 4, 14, 28, 42, and 56 days of age. Blood also was obtained from group-1 pigs remaining in the postweaning unit at 70 days of age, and from 20 to 40 sows 1 to 3 times.

To determine prevalence of seropositive pigs in all age groups for the entire study period in herds C to G, blood samples were obtained from 20 pigs/age group (group 2) selected at random at 28, 42, and 56 days of age at each visit. Group-1 pigs were included when they reached 28, 42, and 56 days of age. Pigs were serologically monitored in herds A and B for 3 months and in herds C to G for 5 to 6 months.

Serologic status of pigs at 2 to 4 days of age was not statistically associated with status at 42 days (P = 0.6293) and at 56 days (P = 0.3098) of age for the same pigs. Therefore, seronegative pigs 2 to 4 days old did not seroconvert earlier than did those with detectable maternal antibodies at 2 to 4 days old. Only about 50% of the 70-day-old pigs were seropositive at 56 days. Seemingly, pigs seroconverted late in the postweaning period.

Prevalence of seropositive 42- and 56-day-old pigs varied among and within herds over a short period. The prevalence of A pleuropneumoniae infection in the adult population was not related to the prevalence of the infection in weaned pigs.

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