Experimental model of Border Disease Virus infection in lambs: comparative pathogenicity of pestiviruses isolated in France and Tunisia.
Pestiviruses have been isolated from live sheep pox Tunisian vaccines. Vaccination with these vaccines caused outbreaks of Border Disease in Tunisia. In order to study more precisely the pathogenicity of these isolates, three groups of eight four month old lambs from a pestivirus-free flock were infected by the intratracheal route with a French strain (AV) and two Tunisian isolates (SN3G and Lot21). Clinical, hematological, immunological and virological parameters were evaluated. The three groups developed mild fever and leucopaenia by day 3 to 6 post infection (pi). The differences in the weight curves were not significant. Viruses were isolated from the peripheral blood buffy coat cells by day 4 to 9 pi. Antibodies were present on day 16 pi following infection by the French strain and on day 21 pi with the Tunisian isolates. The results demonstrated that SN3G and Lot21 are almost similar to the French strain used as the reference strain. In field conditions, they could induce economical losses in naive flocks, alone or in association with other pathogens.
Thabti
Fatma
F
AFSSA, Site de Sophia Antipolis, Laboratoire d'Etudes et de Recherches sur les Petits Ruminants et les Abeilles, BP, France.
Fronzaroli
Laure
L
Dlissi
Elyess
E
Guibert
Jean-Michel
JM
Hammami
Salah
S
Pepin
Michel
M
Russo
Pierre
P
D000818:Animals; D000831:Animals, Newborn; D000914:Antibodies, Viral / Q000097:blood; D001882:Border Disease / Q000453:epidemiology / Q000821:virology*; D018083:Border disease virus / Q000145:classification / Q000472:pathogenicity*; D004196:Disease Outbreaks / Q000662:veterinary; D005602:France / Q000453:epidemiology; D011897:Random Allocation; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology / Q000821:virology*; D014416:Tunisia / Q000453:epidemiology; D014611:Vaccination / Q000009:adverse effects / Q000662:veterinary*; D014765:Viral Vaccines / Q000009:adverse effects
D000914:Antibodies, Viral; D014765:Viral Vaccines