Infection and excretion of Salmonella Enteritidis in two different chicken lines with concurrent Ascaridia galli infection.

Nicoline Maag Stokholm (1) , Torben Wilde Schou (2) , Anders Permin (2) , Jens Peter Christensen (2) , Claus Ekstrøm (3) , Francesca Ambrosini (4) , Dario Cianci (5) , Magne Bisgaard (2)

1 Department of Veterinary Pathobiology
2 Department of Veterinay pathobiology
3 Department of Natural Sciences
4 Atelier des Animaux Ltd
5 Department of General and Environmental Physiology

Studies on the impact of interaction of Salmonella enterica serovar Enteritidis and the parasitic nematode Ascaridia galli with the avian host were undertaken with particular emphasis on infection and excretion of these pathogens in two different layer lines. A total of 148 salmonella free day-old chickens (73 Hellevad and 75 Lohmann Brown) were randomly divided into five groups for each line. Group 1 served as an uninoculated control group. Groups 2 and 3 were infected with A. galli and S. Enteritidis, respectively. Group 4 was first infected with S. Enteritidis and subsequently with A. galli and vice-versa for group 5. The number of chickens excreting S. Enteritidis was significantly higher (p< 0.001) in the groups infected with both S. Enteritidis and A. galli compared with those only infected with S. Enteritidis over time. Furthermore, over time excretion of S. Enteritidis was significantly higher (p< 0.001) in the group first infected with S. Enteritidis and subsequently with A. galli compared with the group infected in the reverse order. No significant differences between the two lines were observed concerning excreting of S. Enteritidis over time in any groups (p= 0.61, p= 0.73, p= 0.31). A. galli established itself significantly better (p = 0.02) in the group first infected with A. galli and subsequently with S. Enteritidis compared to the group infected in the reverse order. Furthermore, the A. galli infection rate was significantly higher (p = 0.02) in Hellevad chickens compared to Lohmann Brown chickens at the end of the experiment.

Mots clés: Life Sciences

Nicoline Maag Stokholm, Torben Wilde Schou, Anders Permin, Jens Peter Christensen, Claus Ekstrøm, et al.. Infection and excretion of Salmonella Enteritidis in two different chicken lines with concurrent Ascaridia galli infection.. Avian Pathology, 2007, 35 (06), pp.487-493. ⟨10.1080/03079450601071696⟩. ⟨hal-00540060⟩