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New serotypes of Riemerella anatipestifer isolated from ducks in Thailand
P Pathanasophon1, T Sawada, T Tanticharoenyos
1National Institute of Animal Health, Bangkok, Thailand.
Abstract:
Thirty-two Riemerella anatipestifer isolates from ducks were serotyped by agar gel precepitin test using chicken antisera against serotypes 1 to 19 R. anatipestifer reference strains. The heat stable saline extracts from 29 field isolates reacted with the antisera of serotypes 1, 6, 7, 10, 11, 14, or 19. The isolates belonging to serotype 1 were the most prevalent (56.3%). Antigens from the remaining three isolates did not react with any of the available antisera. Additional investigations showed that they represent two new serotypes, serotypes 20 and 21.
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