Drug Resistance and rpoB Gene Mutation of Riemerella anatipestifer Isolated from Diseased Muscovy Ducks
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摘要:
目的 了解福建省莆田市番鸭源鸭疫里默氏杆菌的耐药性及rpoB基因突变情况。 方法 无菌采集病死番鸭的脑、心脏、肝脏进行细菌分离纯化,提取分离株基因组DNA,利用16S rDNA基因特异性引物进行PCR鉴定,纸片法进行药敏试验,扩增并分析rpoB基因利福平耐药决定区序列。 结果 共分离到49株鸭疫里默氏杆菌,这些菌株均表现广谱耐药性,耐药谱介于11~21种药物,分离株对氨基糖苷类、大环内酯类、复方新诺明、多黏菌素B和利福平等药物的耐药性高,对四环素类、β-内酰胺类和氟苯尼考等药物的敏感性高。44株利福平耐药菌的rpoB基因出现R494K(43/44)单点突变和R494K和V382I(1/44)的双点突变,R494K单点突变也在1株利福平敏感菌中发现。 结论 近期防治鸭传染性浆膜炎可首选四环素类、β-内酰胺类和氟苯尼考等药物,利福平耐药决定区氨基酸的R494K单点突变可能是鸭疫里默氏杆菌对利福平耐药的主要机制之一。 Abstract:Objective Drug resistance and rpoB gene mutation of Riemerella anatipestifer isolated from diseased Muscovy ducks in Putian, Fujian were studied. Method Brain, heart, and liver tissues were aseptically collected from the dead Muscovy ducks that were infected by the disease for isolation, identification, and drug resistance of the pathogen. The genomic DNA of the isolated strains were extracted and the 16S rDNA gene specific primers used for PCR identification. The disk method was applied to test the drug sensitivity of the isolates. The rifampicin resisting region in the rpoB gene was amplified and analyzed. Result Forty-nine strains of R. anatipestifer were isolated to show a broad-spectrum resistance to 11 to 21 kinds of drug, such as, aminoglycosides, macrolides, compound sulfamethoxazole, polymyxin B and rifampicin. But they were highly sensitive to tetracyclines, β-lactams, and florfenicol. In the rpoB gene of 44 rifampicin-resistant strains, a single point mutation, R494K(43/44), and two double point mutations, R494K and V382I (1/44), were found. R494K also existed in one rifampicin sensitive strain. Conclusion It appeared that tetracyclines, β-Lactams, and florfenicol could be the first choice for preventing and treating duck infectious serositis. The single point amino acid mutation location of R494K in the region that determines the rifampicin-resistance could harbor the key to unlocking the mechanisms of the drug resistance of R. anatipestifer. -
Key words:
- Riemerella anatipestifer /
- isolation /
- identification /
- drug resistance /
- rpoB gene
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表 1 引物序列及相关参数
Table 1. Primer sequence and related parameters
表 2 49株鸭疫里默氏杆菌分离株对28种抗菌药物的药敏试验结果
Table 2. Test results on drug sensitivity of 49 R. anatipestifer isolates to 28 antibiotics
% 抗菌药物种类
Types of antibiotics药物名称
Drug name耐药菌株比例
Proportion of drug
resistant strains中介菌株比例
Proportion of
intermediate strains敏感菌株比例
Proportion of
sensitive strainsβ-内酰胺类 β-Lactams 青霉素 G Penicillin G 20.41(10/49) 10.20(5/49) 69.39(34/49) 氨苄西林 Ampicillin 20.41(10/49) 12.24(6/49) 67.35(33/49) 阿莫西林 Amoxicillin 12.24(6/49) 12.24(6/49) 75.51(37/49) 头孢唑林 Cefazolin 2.04(1/49) 2.04(1/49) 95.92(47/49) 头孢曲松 Cefatriaxone 0.00(0/0) 2.04(1/49) 97.96(4849) 头孢西丁 Cefoxitin 2.04(1/49) 0.00(0/0) 97.96(48/49) 头孢他啶 Ceftazidime 2.04(1/49) 2.04(1/49) 95.92(47/49) 头孢克肟 Cefixime 2.04(1/49) 0.00(0/0) 97.96(48/49) 头孢吡肟 Cefepime 2.04(1/49) 0.00(0/0) 97.96(48/49) 氨基糖苷类 Aminoglycosides 链霉素 Streptomycin 100.00(49/49) 0.00(0/0) 0.00(0/0) 庆大霉素 Gentamicin 100.00(49/49) 0.00(0/0) 0.00(0/0) 卡那霉素 Kanamycin 100.00(49/49) 0.00(0/0) 0.00(0/0) 阿米卡星 Amikacin 100.00(49/49) 0.00(0/0) 0.00(0/0) 新霉素 Neomycin 100.00(49/49) 0.00(0/0) 0.00(0/0) 四环素类 Tetracyclines 四环素 Tetracycline 2.04(1/49) 8.16(4/49) 89.80(44/49) 强力霉素 Doxycycline 0.00(0/0) 0.00(0/0) 100.00(49/49) 大环内脂类 Macrolides 红霉素 Erythromycin 100.00(49/49) 0.00(0/0) 0.00(0/0) 阿奇霉素 Azithromycin 89.80(44/49) 6.12(3/49) 4.08(2/49) 喹诺酮类 Quinolones 恩诺沙星 Enrofloxacin 67.35(33/49) 26.53(13/49) 6.12(3/49) 环丙沙星 Ciprofloxacin 59.18(29/49) 30.61(15/49) 10.20(5/49) 氧氟沙星 Ofloxacin 8.16(4/49) 2.04(1/49) 89.80(44/49) 诺氟沙星 Norfloxacin 81.63(40/49) 12.24(6/49) 6.12(3/49) 萘啶酸 Nalidixic acid 24.49(12/49) 32.65(16/49) 42.86(21/49) 吡哌酸 Pipemidic Acid 95.92(47/49) 2.04(1/49) 2.04(1/49) 磺胺类 Sulfonamides 复方新诺明 SMZ-TMP 100.00(49/49) 0.00(0/0) 0.00(0/0) 多肽类 Polypeptides 多黏菌素 BPolymyxin B 91.84(45/49) 4.08(2/49) 4.08(2/49) 酰胺醇类 Amphenicols 氟苯尼考 Florfenicol 2.04(1/49) 0.00(0/0) 97.96(48/49) 利福霉素类 Rifamycins 利福平 Rifampicin 89.80(44/49) 0.00(0/0) 10.20(5/49) 表 3 49株鸭疫里默氏杆菌分离株的多重耐药性
Table 3. Multidrug resistance of 49 R. anatipestifer isolates
抗菌药物数量
Antibiotics amount耐药菌株数量
Drug resistance amount/株耐药率
Drug resistance rate/%11耐 11 resistance 1 2.04 12耐 12 resistance 9 18.37 13耐 13 resistance 17 34.69 14耐 14 resistance 13 26.53 15耐 15 resistance 4 8.16 16耐 16 resistance 1 2.04 17耐 17 resistance 2 4.08 18耐 18 resistance 1 2.04 21耐 21 resistance 1 2.04 表 4 49株鸭疫里默氏杆菌耐药株rpoB基因突变位置
Table 4. Mutation locations of rpoB gene in 49 resistant strains of R. anatipestifer
核苷酸突变
Nucleotide mutation氨基酸突变
Amino acid mutation突变率
Mutation rate/%耐药菌株数
Resistance strain amount敏感菌株数
Sensitive strain amountGTA→ATA、AGA→AAA V382I、
R494K2.04(1/49) 1 0 CAT→AAT H491N 8.16(4/49) 0 4 AGA→AAA R494K 89.80(44/49) 43 1 注:V:缬氨酸(Val);I:异亮氨酸(Ile);H:组氨酸(His);N:天冬酰胺(Asn);R:精氨酸(Arg);K:赖氨酸(Lys)。
Note: V: valine (Val); I: isoleucine (Ile); H: histidine (His); N: asparagine (Asn); R: arginine (Arg); K: lycine (Lys). -
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