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Fig. 1.

Antibiotic resistance of Gallibacterium anatis biovar haemolytica isolates by the anatomical tracts from which they were isolated (minimum inhibitory concentration (MIC) method) red line – dilution at which resistance started; * – statistically significant differences (P-value <0.05) between strains isolated from the gastrointestinal tract and other tracts
Antibiotic resistance of Gallibacterium anatis biovar haemolytica isolates by the anatomical tracts from which they were isolated (minimum inhibitory concentration (MIC) method) red line – dilution at which resistance started; * – statistically significant differences (P-value <0.05) between strains isolated from the gastrointestinal tract and other tracts

Fig. 2.

Venn diagram of the numbers of antibiotics resisted by at least 50% of isolates from the chicken respiratory, reproductive and gastrointestinal tracts GA – Gallibacterium anatis
Venn diagram of the numbers of antibiotics resisted by at least 50% of isolates from the chicken respiratory, reproductive and gastrointestinal tracts GA – Gallibacterium anatis

Fig. 3.

Venn diagram of a) virulence genes and b) resistance genes in Gallibacterium anatis biovar haemolytica * – statistically significant differences (P-value < 0.05) between the presence of the GtxA and gyrB virulence genes and presence of the flfA gene ** – statistically significant differences associated with the presence of virulence genes GtxA and gyrB, and the presence of resistance genes tetH, aphA and blaROB (P-value < 0.05)
Venn diagram of a) virulence genes and b) resistance genes in Gallibacterium anatis biovar haemolytica * – statistically significant differences (P-value < 0.05) between the presence of the GtxA and gyrB virulence genes and presence of the flfA gene ** – statistically significant differences associated with the presence of virulence genes GtxA and gyrB, and the presence of resistance genes tetH, aphA and blaROB (P-value < 0.05)

List of Gallibacterium anatis isolates obtained from flocks of hens

Isolate Type of flock Age of birds (weeks) Tract of sample origin
GA1 layer 28 respiratory
GA2 layer 28 respiratory
GA3 layer 31 respiratory
GA4 layer 30 reproductive
GA5 layer 28 reproductive
GA6 layer 31 reproductive
GA7 layer 31 reproductive
GA8 layer 28 reproductive
GA9 layer 28 reproductive
GA10 layer 30 reproductive
GA11 layer 25 respiratory
GA12 broiler 4 respiratory
GA13 broiler 4 respiratory
GA14 broiler 3 respiratory
GA15 layer 27 reproductive
GA16 layer 29 reproductive
GA17 layer 28 reproductive
GA18 broiler 4 respiratory
GA19 broiler 4 gastrointestinal
GA20 broiler 3 gastrointestinal
GA21 broiler 4 gastrointestinal
GA22 broiler 4 gastrointestinal
GA23 broiler 3 gastrointestinal
GA24 broiler 4 gastrointestinal
GA25 broiler 4 gastrointestinal
GA26 broiler 4 gastrointestinal

Antibiotic resistance of Gallibacterium anatis biovar haemolytica isolates by anatomical tract of sample origin (disc diffusion method)

Antibiotic Dose μg Respiratory (n) Resistance (%) Reproductive (n) Resistance (%) Gastrointestinal (n) Resistance (%)
enrofloxacin 5 2 25.0 10 100.0 5 62.5
tilmicosin 15 8 100.0 10 100.0 8 100.0
amoxicillin 25 5 62.5 10 100.0 8 100.0
doxycycline 30 5 62.5 2 20.0 8 100.0
ceftazidime 30 1 12.5 1 10.0 5* 62.5
tylosin 30 8 100.0 10 100.0 3* 37.5
colistin 50 2 25.0 1 10.0 8* 100.0
florfenicol 30 3 37.5 1 10.0 5 62.5

List of antibiotics used to determine the antibiotic susceptibility of Gallibacterium anatis biovar haemolytica isolates

Antibiotic class Antibiotic
aminoglycoside gentamicin
β-lactam amoxicillin
ampicillin
cephalosporin ceftazidime
amphenicol florfenicol
chloramphenicol
fluoroquinolone enrofloxacin
ciprofloxacin
glycopeptide vancomycin
teicoplanin
lipopeptide daptomycin
macrolide erythromycin
tylosin
tilmicosin
oxazolidinone linezolid
polymyxin colistin
streptogramin quinupristin/dalfopristin
tetracycline tetracycline
doxycycline
tigecycline

Antibiotic resistance of Gallibacterium anatis biovar haemolytica isolates (disc diffusion and minimum inhibitory concentration methods)

Antibiotic class Antibiotic Resistance %
aminoglycoside gentamicin 69.2
β-lactam amoxicillin 88.0
ampicillin 73.1
cephalosporin ceftazidime 19.0
amphenicol florfenicol 15.0
chloramphenicol 0.0
fluoroquinolone enrofloxacin 88.0
ciprofloxacin 69.2
glycopeptide vancomycin 88.5
teicoplanin 92.3
lipopeptide daptomycin 69.2
erythromycin 96.2
macrolide tylosin 100.0
tilmicosin 100.0
oxazolidinone linezolid 92.3
polymyxin colistin 31.0
streptogramin quinupristin/dalfopristin 100.0
tetracycline tetracycline 96.2
doxycycline 46
tigecycline 57.7
eISSN:
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Langue:
Anglais
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Sujets de la revue:
Life Sciences, Molecular Biology, Microbiology and Virology, other, Medicine, Veterinary Medicine