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Acquired non-incarcerated inguinal/scrotal herniation in working donkeys (Equus asinus) 驴(马)获得性非嵌顿腹股沟/阴囊疝
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2396
M. Marzok, A. M. Moustafa
In equine practice, inguinal hernia is a common disease and can be either acquired (direct) or congenital (indirect). This retrospective study aimed to describe the presentation and surgical management of acquired inguinal/scrotal herniation in 11 working donkeys (nine intact males, one gelding, and one female). All donkeys had a unilateral acquired inguinal/scrotal hernia, which was noticed by the owner for a period of two to 24 weeks. All the swellings were reducible, painless, not accompanied by an acute abdomen. Ultrasonography, rectal, and clinical examination are useful tools for the diagnosis of inguinal/scrotal hernias in donkeys. Eight animals underwent successful inguinal herniorrhaphy with the removal of the testicle at the affected side, and the superficial inguinal ring was closed by application double-layer polypropylene mesh. The recovery period ranged from 14 to 25 days (average, 16.8 ± 2.8 days). All donkeys released from the clinic returned to their previous levels of exercise. Our study showed that acquired inguinal or scrotal herniation in donkeys is not a clinical emergency requiring prompt intervention. To the best of our knowledge, this is the first report describing this condition in donkeys.
在马的实践中,腹股沟疝是一种常见的疾病,可以是获得性(直接)或先天性(间接)。本回顾性研究旨在描述11头工作驴(9头完整公驴,1头阉驴和1头母驴)后天性腹股沟/阴囊疝的表现和手术治疗。所有的驴都有单侧获得性腹股沟/阴囊疝,这是由主人注意到的,持续了2至24周。所有的肿胀都是可减轻的,无痛的,没有伴有急腹症。超声、直肠和临床检查是诊断驴腹股沟/阴囊疝的有用工具。8只动物成功行腹股沟疝修补术,切除患侧睾丸,应用双层聚丙烯网片封闭腹股沟浅环。恢复时间14 ~ 25 d,平均16.8±2.8 d。所有从诊所释放的驴子都恢复到以前的运动水平。我们的研究表明驴获得性腹股沟或阴囊疝不是一个需要及时干预的临床紧急情况。据我们所知,这是第一份描述驴子这种情况的报告。
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引用次数: 0
Comparison of cardiorespiratory and anaesthetic effect of alfaxalone or propofol in dogs premedicated with acepromazine-buprenorphine 乙酰丙嗪-丁丙诺啡预先给药犬阿法索酮与异丙酚的心肺和麻醉效果比较
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2410
S. O. Adediran, A. Adetunji
The study compared the cardiorespiratory and anaesthetic effects of alfaxalone or propofol for total intravenous anaesthesia (TIVA) in dogs premedicated with acepromazine-buprenorphine. Six adult Nigerian dogs with mean±S.D. body weight of 11.5±1.6 kg were studied. Acepromazine hydrochloride (0.03 mg/kg) and buprenorphine (0.02 mg/kg) were mixed in the same syringe and administered intramuscularly as premedicants. Following obvious sedation, anaesthesia was induced with bolus intravenous (IV) injection of either 2.0 mg/kg alfaxalone or 4.0 mg/kg propofol over a period of about 30 s. Repeated IV bolus injection of either 1.0 mg/kg alfaxalone or 2.0 mg/kg propofol was administered at 10 minute interval for maintenance of anaesthesia over 90 minutes. Physiological variables were measured and recorded at 15 minute intervals over 90 minutes using a multi-parameter monitor. Onset and duration of analgesia with alfaxalone protocol (2.2±0.4 min and 106.2±4.0 min) were significantly (P<0.05) shorter than those with propofol protocol (4.5±1.4 min and 124.5±3.4 min) respectively. Duration of recumbency with alfaxalone (159.5±18.9 min) and propofol (150.8±5.7 min) were not significantly different. Time to standing and recovery time with alfaxalone (38.2±10.8 min and 76.8±28.4 min) were significantly (P<0.05) longer than those with propofol (14.0±3.8 min and 23.5±6.4 min respectively). There were no significant differences between mean heart rate (HR), mean arterial pressure (MAP), respiratory rate (RR), haemoglobin oxygen saturation (SpO2) and rectal temperature (RT) between both protocols. In conclusion, either alfaxalone or propofol appeared to be equally efficacious and safe for induction and maintenance of anaesthesia in healthy dogs premedicated with acepromazine-buprenorphine.
本研究比较了在全静脉麻醉(TIVA)中预先给药乙酰丙嗪-丁丙诺啡犬的阿法索酮或异丙酚的心肺和麻醉效果。6只成年尼日利亚犬,平均±sd体重为11.5±1.6 kg。将盐酸乙酰丙嗪(0.03 mg/kg)与丁丙诺啡(0.02 mg/kg)混合在同一注射器中,作为前药肌注。明显镇静后,静脉注射2.0 mg/kg阿法沙龙或4.0 mg/kg异丙酚,麻醉时间约30 s。每隔10分钟反复静脉注射1.0 mg/kg阿法索龙或2.0 mg/kg异丙酚,维持麻醉90分钟以上。使用多参数监测器在90分钟内每隔15分钟测量和记录生理变量。alfaxone组镇痛起效时间(2.2±0.4 min)和持续时间(106.2±4.0 min)明显短于异丙酚组(4.5±1.4 min和124.5±3.4 min) (P<0.05)。丙泊酚(150.8±5.7 min)与alfaxone(159.5±18.9 min)的卧位时间无显著差异。alfaxone组站立时间(38.2±10.8 min)和恢复时间(76.8±28.4 min)明显长于异丙酚组(14.0±3.8 min和23.5±6.4 min) (P<0.05)。两种治疗方案的平均心率(HR)、平均动脉压(MAP)、呼吸频率(RR)、血红蛋白氧饱和度(SpO2)和直肠温度(RT)无显著差异。综上所述,对于预先使用乙酰丙嗪-丁丙诺啡的健康犬,无论是甲氧嘧啶还是异丙酚,诱导和维持麻醉似乎都是同样有效和安全的。
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引用次数: 1
Protease activity in the excretory-secretory products of nymphal stage of Linguatula serrata: First detection of a metalloprotease 锯齿舌虫若虫期排泄-分泌产物中的蛋白酶活性:一种金属蛋白酶的首次检测
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2414
N. Hajipour, M. Tavassoli, H. Tayefi-Nasrabadi
The aim of this study was to evaluate the presence of proteases and determine the main protease present in the excretory-secretory products (ESPs) from nymphal stage of Linguatula serrata. Infected mesenteric lymph nodes of goats were collected from Tabriz slaughterhouse, northwestern Iran. Recovered Linguatula serrata nymphs were immersed in culture medium (MEM), then ESPs were collected and protease activity in presence of specific inhibitors was assayed. Protease enzyme was further characterised by SDS-PAGE. The results of this study showed that the main protease in the ESPs from the nymphal stage of L. serrata was a metalloprotease that was resistant to heat. In conclusion, these data show that a major protease secreted by the larval stage of L. serrata exhibited properties that may play a role in the pathogenesis of L. serrata nymphs.
本研究的目的是评估蛋白酶的存在,并确定主要的蛋白酶存在于舌苔稚期的排泄-分泌产物(ESPs)中。来自伊朗西北部大不里士屠宰场的山羊感染肠系膜淋巴结。将恢复的锯齿舌螈若虫浸泡在培养基(MEM)中,收集esp,并检测特异性抑制剂存在时的蛋白酶活性。进一步用SDS-PAGE对蛋白酶进行表征。本研究结果表明,锯齿乳杆菌若虫期esp的主要蛋白酶是一种耐热的金属蛋白酶。综上所述,这些数据表明,锯齿状乳杆菌幼虫期分泌的一种主要蛋白酶可能在锯齿状乳杆菌若虫的发病机制中发挥作用。
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引用次数: 0
An overview on riemerellosis: A worldwide emerging disease of ducks 里默氏菌病:一种世界性的鸭类新发疾病
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2021-0071
W. A. Abd El-Ghany
Riemerella anatipestifer (R. anatipestifer) is the bacterial cause of an economically important and serious disease of ducks and other poultry species. Extensive reports showed that this disease condition is widely distributed in different countries since 1904. Horizontal and mechanical transmissions are important routes of R. anatipestifer dissemination. The disease is characterised by respiratory, nervous and locomotor disturbance with high mortality rates especially in ducklings. Affected birds showed generalised polyserositis or localised lesions in different organs. The clinical picture of R. anatipestifer is similar to and confused with other bacterial infections, so diagnosis of the disease relies mainly on laboratory techniques. At least 21 serotypes of R. anatipestifer have been identified. Control of R. anatipestifer infection mainly depends on using of the suitable antibiotics according to the antibiogram results. Due to the extensive and hazardous uses of antibiotics, development of multi-drug resistance strains of R. anatipestifer is common. Prevention of the disease can be achieved though application of good management practice and vaccination. Different types of vaccines are commercially available. There are autogenous polyvalent live or inactivated bacterins as well as subunit and recombinant vaccines. The vaccines give protection only for the specific serotypes present in the used vaccines. Therefore, this review article gives an overview on R. anatipestifer infections regarding the distribution all over the world, susceptibility and infection, clinical picture, laboratory diagnosis as well as prevention and control methods.
鸭疫里默氏菌是鸭和其他家禽的一种经济上重要和严重的疾病的细菌病因。大量报告表明,自1904年以来,这种疾病在不同国家广泛分布。水平传播和机械传播是禽疫鼠传播的重要途径。该病的特点是呼吸、神经和运动障碍,死亡率高,特别是在雏鸭中。病禽表现为全身性多浆膜炎或不同器官的局部病变。鸭疫R.的临床表现与其他细菌感染相似,并与之混淆,因此该病的诊断主要依靠实验室技术。已鉴定出至少21种禽疫鼠血清型。控制禽疫体感染主要依靠根据抗生素检查结果选用合适的抗生素。由于抗生素的广泛和危险使用,禽疫杆菌的多重耐药菌株的发展是常见的。通过应用良好的管理做法和接种疫苗,可以实现疾病的预防。市面上有不同类型的疫苗。有自体多价活的或灭活的细菌以及亚基和重组疫苗。这些疫苗仅对所用疫苗中存在的特定血清型提供保护。为此,本文就鸭疫体感染在世界范围内的分布、易感性和感染情况、临床表现、实验室诊断和防治方法等方面作一综述。
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引用次数: 0
Shelter disease surveillance and shelter welfare assessment in short term housing shelters: A cross-sectional study 短期住房庇护所疾病监测和庇护所福利评估:一项横断面研究
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2021-0024
Y. Ozturan, I. Akin
Six shelters with 7,468 animals (2,305 cats and 5,163 dogs) were followed and diseases and shelter welfare conditions were recorded for one year. Disease records were obtained and categorised on three headings (surgery, internal medicine, and reproductive diseases and interventions) and subheading categories. Descriptive statistics was used to reveal disease distribution, which can attribute to surveillance data. To evaluate shelter welfare conditions, a protocol was developed and shelters were assessed. Under the surgical disease category, the most encountered disease records were open wounds (502, 59.41% and 175, 31.99%) for dogs and cats. For the internal medicine category, the most encountered were respiratory system diseases both for dogs (917, 33.26%) and cats (351, 58.21%). Under the reproductive disease category, the most common disease in dogs was orchitis (29, 60.42%). In cats, the most encountered disease was metritis (19, 79.16%). Ordinal logistic regression was used for evaluation of associations between diseases and shelter conditions. For dogs, with a one-point increase in shelter score, the odds of encountering reproductive diseases increased by 1.4%, while the odds of cumulative and internal diseases decreased 1.1 and 1.2 times (P<0.05) respectively. For cats, with an increase in shelter scores, the odds of encountering reproductive and cumulative diseases increased by 3.4% and 0.2%, respectively (P<0.05). Disease surveillance and their relation with shelter conditions may be helpful to design efficient plans in shelters.
对6个收容所的7 468只动物(2 305只猫和5 163只狗)进行了为期一年的跟踪调查,并记录了疾病和收容所的福利状况。获得的疾病记录按三个标题(外科、内科、生殖疾病和干预措施)和副标题分类。描述性统计用于揭示疾病分布,可归因于监测数据。为了评估收容所福利状况,制定了一项协议,并对收容所进行了评估。在外科疾病类别中,狗和猫的开放性伤口记录最多(502例,占59.41%;175例,占31.99%)。在内科类别中,遇到最多的是呼吸系统疾病,狗(917例,33.26%)和猫(351例,58.21%)。在生殖疾病类别中,狗最常见的疾病是睾丸炎(29,60.42%)。在猫中,最常见的疾病是子宫炎(19,79.16%)。序贯逻辑回归用于评估疾病与住房条件之间的关联。对于狗来说,庇护所得分每增加1分,遇到生殖疾病的几率增加1.4%,而累积疾病和内部疾病的几率分别降低1.1倍和1.2倍(P<0.05)。对于猫来说,随着庇护所得分的增加,遇到生殖疾病和累积疾病的几率分别增加3.4%和0.2% (P<0.05)。疾病监测及其与庇护所条件的关系可能有助于设计有效的庇护所计划。
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引用次数: 0
Tulathromycin – a semi-synthetic macrolidе antibiotic. II. Usage in veterinary medicine 图拉霉素-一种半合成大环内酯抗生素。2兽医学用途
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2326
D. Mladenov, S. Yordanov, A. Dimitrova
This article presents the results of studies on the use of the new macrolide antibiotic tulathromycin in veterinary medicine. The information is presented according to the species of domestic animals, diseases, doses and shemes for therapy and metaphylaxis. The first section includes data for cattle and calves affected by respiratory diseases, caused by M. haemolytica, M. bovis, H. somni and P. multocida, and keratoconjunctivitis caused by M. bovis. The second one shows data for swine and pigs affected by the respiratory pathogens A. pleuropneumoniae, P. multocida, H. parasuis, B. bronhiseptica and M. hyopneumoniae. A third group presents information about small ruminants with manifested respiratory diseases caused by M. haemolytica, P. multocida, Mycoplasma spp., Pseudomonas spp. and hoof diseases from Dehelobacter nodosus. Fourth group includes the first test results of Rhodococcus equi, Streptococcus zooepidemicus, Theileria equi, Babesia bovis and Babesia bigemina, causing diseases in horses. The fifth section includes reports of treated rabbits most commonly suffering from P. multocida respiratory infections. Finally, data from new studies on the use of tulathromycin in exotic animals and cases of some tropical diseases are listed. The provided information gives proof for the high sensitivity of the tested pathogens to tulathromycin and high clinical and economical effect that is efficient in single dose of 2.5 mg/kg. Compared to other antibacterial agents there is no resistance according to data available so far. Local accumulation and prolonged persistence of the drug in lung tissues, that result in a treatment regime with a single low-volume dose (2.5 mg/kg), are associated with positive clinical outcome in domestic animals: large ruminants, pigs, small ruminants and rabbits with respiratory diseases caused by M. haemolytica, H. somni, P. multocida and M. bovis; A. pleuropneumoniae, B. bronchiseptica, P. multocida, H. parasuis and M. hyopneumoniae; S.aureus, C. pseudotuberculosis and Streptococcus spp. and P.multocida
本文介绍了新型大环内酯类抗生素图拉霉素在兽药中的应用研究结果。这些资料是根据家畜的种类、疾病、治疗和过敏反应的剂量和方案提供的。第一部分包括受溶血性支原体、牛支原体、嗜血杆菌和多杀性支原体引起的呼吸道疾病以及牛支原体引起的角膜结膜炎影响的牛和小牛的数据。第二份报告显示了猪和受呼吸道病原体感染的猪的数据,包括胸膜肺炎单胞杆菌、多杀性单胞杆菌、副猪嗜血杆菌、支气管肺炎双胞杆菌和肺炎支原体。第三组提供了由溶血支原体、多杀性假单胞菌、支原体、假单胞菌和结状脱helobacter nodosus引起的蹄疾病引起的呼吸道疾病的小反刍动物的信息。第四组包括马红球菌、动物流行链球菌、马伊氏杆菌、牛巴贝斯虫和双头巴贝斯虫的首次检测结果,它们会引起马匹疾病。第五部分包括治疗兔最常见的多杀性假单胞菌呼吸道感染的报告。最后,列出了图拉霉素在外来动物和一些热带病病例中使用的新研究数据。所提供的信息证明了所测病原体对图拉霉素的高敏感性和高临床和经济效果,单次剂量为2.5 mg/kg有效。与其他抗菌剂相比,根据目前的数据,它没有耐药性。该药物在肺组织内的局部积累和长期存在,导致采用单一低容量剂量(2.5 mg/kg)的治疗方案,这与家畜的临床结果呈正相关:患有溶血性支原体、索姆尼嗜血杆菌、多杀性支原体和牛支原体引起的呼吸道疾病的大型反刍动物、猪、小型反刍动物和兔子;胸膜肺炎支原体、支气管肺炎支原体、多杀性支原体、副猪嗜血杆菌和肺炎支原体;金黄色葡萄球菌、假结核杆菌、链球菌和多杀假葡萄球菌
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引用次数: 0
Age-dependent distribution and size of lymphatic nodules as components of extrahepatic bile duct-associated lymphatic tissue in domestic swine - a micromorphometric study 作为肝外胆管相关淋巴组织组成部分的淋巴结节的年龄依赖性分布和大小——一项微形态计量学研究
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2021-0003
I. Stefanov
Due to the biological and immunological similarity between pigs and humans, pigs are used in medical research. Many morphological studies regarding the structure of the components of mucosal associated lymphatic tissue have been performed in animals including pigs as well as in humans. However, no any information about the existence of extrahepatic bile duct-associated lymphoid tissue (EHBDALT) is available in pigs. The aim of this work was to study the distribution and size of lymphatic nodules in the wall of extrahepatic bile ducts of immature and mature pigs in order to describe the structure of EHBDALT as component of mucosa-associated lymphoid tissue. It was found out that EHBDALT consisted of diffuse lymphatic tissue, solitary and aggregated lymphatic nodules. In 2-month-old pigs, diffuse lymphatic tissue predominated but single lymphatic nodules were found as inactive homogenous encapsulated aggregates of lymphocytes. In mature animals, diffuse lymphatic tissue, primary and secondary nodules were observed. The present micromorphometric study allowed evaluating the age-dependent distribution and size of lymphatic nodules in porcine extrahepatic bile ducts. It provides original data on the presence and age-dependent structure of bile duct MALT in domestic pigs.
由于猪和人在生物学和免疫学上的相似性,猪被用于医学研究。关于粘膜相关淋巴组织成分结构的许多形态学研究已经在包括猪和人类在内的动物中进行了。然而,没有任何关于猪肝外胆管相关淋巴组织(EHBDALT)存在的信息。这项工作的目的是研究未成熟和成熟猪肝外胆管壁淋巴结节的分布和大小,以描述EHBDALT作为粘膜相关淋巴组织组成部分的结构。发现EHBDALT由弥漫性淋巴组织、孤立性和聚集性淋巴结节组成。在2个月大的猪中,弥漫性淋巴组织占主导地位,但单个淋巴结节被发现为无活性的均匀淋巴细胞包裹聚集体。成熟动物可见弥漫性淋巴组织、原发性和继发性结节。目前的微形态计量学研究允许评估猪肝外胆管淋巴结节的年龄依赖性分布和大小。它提供了关于家猪胆管MALT存在和年龄相关结构的原始数据。
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引用次数: 0
The beneficial effects of enriched diet on testicular blood flow and seminal parameters using colour and pulsed Doppler ultrasound in dogs 利用彩色和脉冲多普勒超声研究强化饮食对犬睾丸血流量和精液参数的有益影响
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2021-0037
E. A. Abdelnaby, Kh. G. Abd El khalek, I. A. Emam
Maintenance of the reproductive fitness quality in dogs is a field of interest in animal practice. Therefore, this study was conducted for the first time to predict the response of sub-fertile dogs to vitamin and mineral supplementation by evaluating testicular haemodynamics and measuring the changes in peak systolic velocity (PSV), end-diastolic velocity (EDV), resistance index (RI), and pulsatility index (PI). Dogs were categorised into three groups (15 in each group): control, vehicle group and supplemented group. Semen evaluation, blood sampling and Doppler were performed on days (D) 0, 30, 60, and 90. In the sub-fertile dogs, semen volume increased from D0 to D90, and Doppler indices correlated negatively (P≤0.05) with testicular blood velocities, nitric oxide metabolites (NO), testosterone levels, scrotal circumference, testicular volume, and testicular coloured area. Doppler indices decreased (P≤0.05) in the hypospermic males from D0 to D90 compared to the normal values. The supplementation improved significantly blood flow by elevating the testicular colouration and decreasing both Doppler indices as the increase in testicular coloured pixels in the supplemented males may be accompanied by an increase in testicular volume, testosterone, and nitric oxide levels.
犬生殖健康质量的维持是动物实践中一个感兴趣的领域。因此,本研究首次通过评估睾丸血流动力学,测量收缩峰值速度(PSV)、舒张末期速度(EDV)、阻力指数(RI)和脉搏指数(PI)的变化来预测亚育犬对维生素和矿物质补充的反应。将犬分为3组(每组15只):对照组、载药组和补充组。在第0、30、60和90天进行精液评估、采血和多普勒检查。亚育犬精液量在D0 ~ D90期间呈上升趋势,多普勒指数与睾丸血流速度、一氧化氮代谢物(NO)、睾酮水平、阴囊周长、睾丸体积、睾丸颜色面积呈负相关(P≤0.05)。低精子男性D0 ~ D90多普勒指数较正常值下降(P≤0.05)。补品通过提高睾丸颜色和降低两种多普勒指数显著改善了血流量,因为补品雄性睾丸颜色像素的增加可能伴随着睾丸体积、睾丸激素和一氧化氮水平的增加。
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引用次数: 2
Ethylene glycol intoxication in a pregnant cat and a tomcat 乙二醇中毒在怀孕的猫和雄猫
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2021-0027
Ts. Hristov, A. Rusenov, R. Simeonov, I. Kalkanov
Clinical cases of two cats, poisoned with ethylene glycol: one tomcat and a pregnant female in the last quarter of gestation, are presented. Cats were reared outdoor. The history included a sudden weakness, inappetence, lethargy and repeated vomiting in both animals. Physical examination showed reduced skin elasticity, hypothermia (37.3 С° and 37.8 С°), hyporeflexia, pale mucous coats. Blood biochemical changes comprised hyperglycaemia (7.74 and 10.1 mmol/L), hyperphosphataemia (6.3 and 5.67 mmol/L), increased urea (66.6 and 68.2 mmol/L) and creatinine concentrations (1408 and 918 µmol/L). Ultrasound examination showed severely increased corticomedullary echogenicity of kidneys, including foetal kidneys. Blood sample obtained post mortem from foetuses was characterised with dramatically increased phosphate (11.3 mmol/L), urea (66.2 mmol/L) and creatinine concentrations (642 µmol/L). Foetal urine had abundant calcium oxalate monohydrate crystals. Such crystals were present also in histological preparations from kidneys of both adult cats and foetuses.
临床病例两只猫,中毒与乙二醇:一只雄猫和怀孕的女性在妊娠的最后一个季度,提出。猫是在室外饲养的。病史包括突然虚弱、食欲不振、嗜睡和反复呕吐。体格检查显示皮肤弹性降低,体温过低(37.3 С°和37.8 С°),反射能力低下,粘膜层苍白。血液生化变化包括高血糖(7.74和10.1 mmol/L)、高磷酸盐(6.3和5.67 mmol/L)、尿素(66.6和68.2 mmol/L)和肌酐浓度(1408和918µmol/L)升高。超声检查显示肾脏(包括胎儿肾脏)皮质髓样回声增强严重。胎儿死后血液样本的特征是磷酸盐(11.3 mmol/L)、尿素(66.2 mmol/L)和肌酐浓度(642µmol/L)显著升高。胎儿尿液中含有丰富的一水草酸钙晶体。这种晶体也存在于成年猫和胎儿肾脏的组织学准备中。
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引用次数: 0
Evolution of avian infectious bronchitis vaccine viruses reisolated from vaccinated broilers 从接种疫苗的肉鸡中再分离的禽传染性支气管炎疫苗病毒的进化
Q3 Veterinary Pub Date : 2023-01-01 DOI: 10.15547/bjvm.2022-0011
A. Boudaoud, A. Barberis
Genetic and phenotypic diversity among infectious bronchitis virus (IBVs) is a key element of the epidemiology of avian infectious bronchitis. Virtually, all studies have focused on the evolution of wild viruses. Live-attenuated vaccine strains deserve a special attention. Two strains of IBV, 2T/17 and 16T/17, detected by quantitative reverse transcription polymerase chain reaction (qRT-PCR) in samples from H120 vaccinated chickens showing respiratory signs, were genetically analysed targeting the S1 gene. The total RNA was extracted by the classical Trizol method. The whole S1 gene was amplified in an end-point RT-PCR using a specific primer pair, before being sequenced. The obtained sequences were compared to those of vaccine strains and reference viruses and finally subjected to a phylogenetic analysis. The two isolates turned out to be vaccine strains as evidenced by the monophyletic cluster they formed with the H120 vaccine strain (100% bootstrap). Also, they shared with this vaccine strain 99.60% and 99.47% of nucleotides (nt) for strain 2T/17 and 16T/17 respectively. The sequence alignment revealed, for each of the two strains, one non-synonymous nt substitution outside the hypervariable regions: C56T and T39G leading to two amino acid (aa) substitutions: Alv19Val and Cys13Trp, respectively for the strain 2T/17 and 16T/17. The second hypervariable region of strain 2T/17 displayed 2 nt substitutions at positions 345 and 347, resulting in an aa substitution Lys116Thr. As for 16T/17 strain, it harboured two non-synonymous nt substitutions (T353G and T380G), leading to two aa substitutions: Val118Gly and Met127Arg. The chromatogram analysis revealed minor and major peaks at all positions where nt changes were observed. Nucleotides associated with minor peaks matched with those observed in the sequence of the H120 vaccine strain at the same positions, indicating subpopulation selection. Only the substitution T353G results in a mutation as evidenced by the absence of minor peak at this position. Viral subpopulations contained in IBV live-attenuated vaccines are susceptible to be in vivo selected and emerge as persistent pathotype with reversion to virulence. This draws attention to the need of monitoring the evolution of IBV vaccine strains.
传染性支气管炎病毒(ibv)的遗传和表型多样性是禽传染性支气管炎流行病学的一个关键因素。实际上,所有的研究都集中在野生病毒的进化上。减毒活疫苗毒株值得特别注意。采用定量反转录聚合酶链反应(qRT-PCR)方法,从H120疫苗接种后出现呼吸体征的鸡标本中检测到2株IBV 2T/17和16T/17,对其S1基因进行了遗传分析。采用经典Trizol法提取总RNA。在测序之前,使用特定的引物对在终点RT-PCR中扩增整个S1基因。将获得的序列与疫苗株和参考病毒的序列进行比较,最后进行系统发育分析。这两株分离株与H120疫苗株(100%自举)形成的单系群证明是疫苗株。此外,它们与该疫苗株的2T/17和16T/17分别具有99.60%和99.47%的核苷酸(nt)。序列比对显示,两株菌株在高变区C56T和T39G外各有一个非同义的nt替换,导致菌株2T/17和16T/17的两个氨基酸(aa)替换:Alv19Val和Cys13Trp。菌株2T/17的第二个高变区在345位和347位出现了2个nt的取代,导致一个aa取代Lys116Thr。对于16T/17菌株,它包含两个非同义的nt替换(T353G和T380G),导致两个aa替换:Val118Gly和Met127Arg。色谱分析显示,在观察到nt变化的所有位置都有小峰和主峰。与小峰相关的核苷酸与在相同位置的H120疫苗株序列中观察到的核苷酸相匹配,表明亚群体选择。只有替换T353G导致突变,在该位置没有小峰。IBV减毒活疫苗中包含的病毒亚群很容易在体内被选择,并出现持久的致病型,并恢复到毒力。这使人们注意到监测IBV疫苗株演变的必要性。
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BULGARIAN JOURNAL OF VETERINARY MEDICINE
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