排序方式： 共有25条查询结果，搜索用时 156 毫秒
1.
研究了用生物素标记的寡核苷酸ＤＮＡ探针快速检测鱼传染性胰脏坏死病病毒ＩＰＮＶ，取得了较好的结果。对探针的灵敏度，特异性进行了灵敏度、特异性进行了测定，并与其它快速检测技术作了比较。 相似文献
2.
3.
Infectious pancreatic necrosis virus (IPNV) is the aetiological agent of a highly contagious disease that affects farmed salmonids. IPNV isolates have been phylogenetically classified into eight genogroups, of which two are present in Chile, genogroups 1 and 5. Here, we compare the mortality rate caused by isolates from both genogroups in rainbow trout (Oncorhynchus mykiss) fry to determine if there is an association between host susceptibility and phylogenetic characterization of IPNV. Fish were challenged by immersion with one of four isolates (two for each genogroup), and mortality curves were assessed after 30 days. Viral load was measured in all mortalities and in live fish sampled at 1, 7 and 20 days post-infection. Although mortality was low throughout the challenge, differences were found between fish infected with different isolates. Both isolates from genogroup 1 caused greater cumulative mortalities than either of the isolates from genogroup 5. When combined, the overall mortality rate of fish challenged with genogroup 1 isolates was significantly higher than those infected with genogroup 5. However, viral load was lower on trout infected with genogroup 1 isolates. These results suggest that rainbow trout are more susceptible to IPNV isolates from genogroup 1 than genogroup 5. 相似文献
4.
5.
传染性胰腺坏死病毒VP3蛋白的原核表达及抗原性分析 总被引：1，自引：0，他引：1
应用RT-PCR方法扩增了IPNV编码内衣壳VP3蛋白的基因615bp,将VP3基因克隆至原核表达载体pET30b,并在大肠杆菌BL21中得到了表达。通过SDS-PAGE分析表明,重组菌诱导后得到了预期大小约30ku的VP3蛋白,与理论值相符,经薄层扫描分析表明目的蛋白表达量可占菌体总蛋白的30%。用镍离子亲和层析柱纯化可溶性的VP3蛋白,并制备抗血清。Western-blotting结果显示,VP3蛋白可被兔抗IPNV阳性血清识别;间接ELISA结果显示,IPNV细胞培养物作为抗原,兔抗VP3蛋白高免血清稀释度为1∶25600时,P/N>2,抗血清可与IPNV全病毒发生反应,以上两项结果说明,表达的VP3蛋白与天然的IPNVVP3蛋白一样具有相同的抗原性。试验利用原核表达系统成功地高效表达了IPNVVP3蛋白,融合蛋白以可溶性形式存在,并制备了高效价的抗血清。 相似文献
6.
为获得传染性胰腺坏死病毒(IPNV)VP3蛋白在菌体表面表达,本研究将IPNV VP3基因定向插入乳酸杆菌表面表达型载体pPG1,构建的重组质粒pPG1-VP3电转化干酪乳杆菌,获得了重组干酪乳杆菌表达系统pPG1-VP3/Lactobacillus casei393。经1%糖诱导表达后,SDS-PAGE和western blot检测表明,有约31ku蛋白得到了表达,其大小与理论值相符;诱导表达的菌体进行间接免疫荧光试验表明,重组蛋白在菌体表面获得了表达。该病毒VP3蛋白在乳酸菌的表面表达为进一步探讨传染性胰腺坏死病毒VP3蛋白免疫原性及相关功能奠定了基础。 相似文献
7.
M P Polinski T R Fehringer K A Johnson K R Snekvik S E LaPatra B R LaFrentz S C Ireland K D Cain 《Journal of fish diseases》2010,33(7):559-570
In this study, susceptibility and potential carrier status of burbot, Lota lota, were assessed for five important fish pathogens. Burbot demonstrated susceptibility and elevated mortality following challenge with infectious haematopoietic necrosis virus (IHNV) by immersion and to Aeromonas salmonicida by intraperitoneal (i.p.) injection. IHNV persisted in fish for at least 28 days, whereas A. salmonicida was not re-isolated beyond 17 days post-challenge. In contrast, burbot appeared refractory to Flavobacterium psychrophilum following intramuscular (i.m.) injection and to infectious pancreatic necrosis virus (IPNV) by immersion. However, i.p injection of IPNV resulted in re-isolation of virus from fish for the duration of the 28 day challenge. Renibacterium salmoninarum appeared to induce an asymptomatic carrier state in burbot following i.p. injection, but overt manifestation of disease was not apparent. Viable bacteria persisted in fish for at least 41 days, and bacterial DNA isolated by diagnostic polymerase chain reaction was detected from burbot kidney tissue 90 days after initial exposure. This study is the first to investigate susceptibility of burbot to selected fish pathogens, and this information will aid in efforts to culture and manage this species. 相似文献
8.
In populations of Atlantic salmon in sea water, infectious pancreatic necrosis virus (IPNV) could be detected by standard virological culture methods in sonicated kidney homogenates and in mucus samples (gill, skin and rectum) from 14 and nine of 25 fish, respectively, but all fish were positive by virus culture from lysates of kidney macrophages and adherent blood leucocytes. In fish which tested negative for IPNV by the standard method of detection, the virus could be detected using adherent blood leucocytes isolated on a Percoll gradient from as little as 10 microL of blood. The blood sample could be stored for at least 3 days in a heparinized tube on ice before preparing the plastic adherent leucocytes. Furthermore, the latter could be prepared without prior fractionation on Percoll simply by incubating whole blood (33 microL) in cell culture medium (66 microL) in 96-well plates overnight and washing away the non-adherent cells before lysing the adherent cells and inoculation of the lysate onto CHSE-214 cells. This highly sensitive method for detecting IPNV-carriers is therefore very suitable for non-destructive sampling of fish in the field. 相似文献
9.
10.
Atlantic salmon smolts, previously unexposed to infectious pancreatic necrosis virus (IPNV), were placed into tanks of sea water at 10 °C. After 4 weeks, 40 fish were injected intraperitoneally (i.p.) with homogenized and filter‐sterilized kidney material obtained from salmon with clinical IPN in a marine farm in Shetland. The injected fish were cohabited with 40 untreated fish. Mortalities began in the injected fish on day 7 and reached a peak of 48% on day 14. In the cohabitation group, mortalities began on day 14 and reached a peak of 70% on day 27. The IPNV in the Shetland kidney homogenate was cultured in Chinook salmon embryo (CHSE) cells and passed twice. This cultured virus was injected i.p. into fish at various doses ranging from 10 to 107 TCID50 fish?1 4 weeks after seawater transfer. Challenge tanks contained 30 injected fish and 30 cohabitees. Mortality rates and levels were dose‐dependent. The highest dose used resulted in a similar mortality pattern as obtained with a similar dose of the Shetland kidney homogenate, indicating that virulence was retained after two passes in tissue culture. Even with the lowest dose, mortality reached 12% in the injected group and 23% in the cohabitees. The IPNV titres were high (106?109 i.u. g?1 kidney) in fish which died during the experiment and low (<105 i.u. g?1 kidney) or undetectable in surviving fish. The cultured virus (pass 3) was used in a challenge model where the population density of fish in the tanks was high (50 injected and 50 cohabitees) or low (15 injected and 15 cohabitees). In the high stocking density tank, mortalities peaked at about 35% in the injected group and at 52% in the cohabitees. In the low stocking density tank, mortalities peaked at about 40% in the injected fish but no mortality occurred in the cohabitees. However, IPNV was detected (up to 104 i.u. g?1 kidney) in 82% of cohabitees sampled on day 30. These data suggest that lethal lateral transmission of the virus is dependent on the infectious pressure from the injected group. A further trial was conducted to investigate the effect of time post‐seawater transfer on the susceptibility of post‐smolts to IPN. Groups of fish were challenged every 2 weeks from week 0–10. Few mortalities occurred at week 0 and virus titres were high in these fish. Most survivors became carriers, some with titres >106 i.u. IPNV g?1 kidney. From 2 to 10 weeks after seawater transfer, mortalities in both injected and cohabitees were substantial with viral titres >107 i.u. g?1 kidney. Survivors had lower titres and in many virus was undetectable. Throughout the experiments, moribund fish were sampled for histology and all showed typical IPN histopathology. 相似文献