Genomic diversity and molecular differentiation of Riemerella anatipestifer associated with eight outbreaks in five farms.
Riemerella anatipestifer causes infectious serositis of ducks and geese. The genomic diversity of R. anatipestifer associated with outbreaks in waterfowls was studied using 24 multidrug-resistant R. anatipestifer isolates collected from the visceral organs of ducks and geese from seven outbreaks in four goose farms and one outbreak in one duck farm. Seven methods were used to differentiate these isolates. Plasmid patterns differed in plasmid number and size, ranging from 2.9 kb to 20 kb, and provided seven profiles. Divergent nucleotide sequences (predominant in 670 to 830 base pairs) of the ompA gene categorized the 24 isolates into three groups based on cluster analysis and polymerase chain reaction-restriction fragment length polymorphism. Repetitive-sequence polymerase chain reaction and pulsed-field gel electrophoresis analysis revealed the highest genotypic variations among the isolates. Genotypes and serotypes differed among farms and within the same farm and even within a single goose. In conclusion, a difference in R. anatipestifer genotypes and serotypes was observed for multiple outbreaks in waterfowls.
Department of Veterinary Medicine, National Chiayi University, Chiayi, Taiwan.
Chang-You
CY
Yu
Yi-Wen
YW
Liu
Shih-Jen
SJ
Chou
Maw-Rong
MR
Chao
Bor-Chun
BC
Weng
Jwu-Guh
JG
Tsay
Cheng-Hsun
CH
Chiu
Ching
C
Ching Wu
Tsang
T
Long Lin
Chih-Cheng
CC
Chang
Chishih
C
Chu
D000818:Animals; D001483:Base Sequence; D004269:DNA, Bacterial / Q000235:genetics; D004196:Disease Outbreaks / Q000662:veterinary; D004372:Ducks / Q000382:microbiology*; D005777:Geese / Q000382:microbiology*; D014644:Genetic Variation; D016680:Genome, Bacterial; D006090:Gram-Negative Bacteria / Q000235:genetics*; D016905:Gram-Negative Bacterial Infections / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary; D010802:Phylogeny; D011201:Poultry Diseases / Q000453:epidemiology / Q000382:microbiology*
D004269:DNA, Bacterial