Objective Establishing a highly sensitive real-time fluorescence quantitative PCR (qPCR) method for universal testing of epidemic African swine fever virus (ASFV) strains. Methods The ASFV p72 gene was targeted to des...Objective Establishing a highly sensitive real-time fluorescence quantitative PCR (qPCR) method for universal testing of epidemic African swine fever virus (ASFV) strains. Methods The ASFV p72 gene was targeted to design primer probes covering 24 p72 genotypes. The optimal amount of dimethylsulphoxide (DMSO) for qPCR amplification was determined, Various sensitivity and limit of detection (LOD) tests were performed, and clinical samples from China and imported goods were tested. Results The optimal primer-probe combination could specifically detect ASFV, 1.5% DMSO was optimal for qPCR, and LOD reached 3.2 copies/μL with good reproducibility (n = 20, p = 0.369). The method was employed to test 142 clinically suspected samples, of which 30 pig blood and 37 pig tissue samples were ASFV-positive. Moreover, the positive testing rate for ASFV was higher than for the standard qPCR method recommended by the Office International Des Epizooties (OIE), and for the commercially available kit. Thus, our method is superior for testing weakly positive samples with low virus titre, and epidemic strains present in imported goods. Conclusion Our method could be employed for universal testing of epidemic ASFV strains worldwide, ensuring wider coverage of hosts and ASFV strains/endemic strains, reducing false<span style="font-family:;" "=""> </span><span style="font-family:Verdana;">negatives, and benefitting early diagnosis.</span>展开更多
目的探讨静脉注射人免疫球蛋白(intravenous infusion of human immunoglobulin,IVIG)对川崎病(Kawasaki disease,KD)患儿冠状动脉(冠脉)病变发生的影响。方法选择2019年1月至2022年5月在东莞市妇幼保健院住院确诊并治疗的KD患儿,根据...目的探讨静脉注射人免疫球蛋白(intravenous infusion of human immunoglobulin,IVIG)对川崎病(Kawasaki disease,KD)患儿冠状动脉(冠脉)病变发生的影响。方法选择2019年1月至2022年5月在东莞市妇幼保健院住院确诊并治疗的KD患儿,根据有无冠脉病变将患儿分为无冠脉病变组和冠脉病变组。对两组患者的发热时间、IVIG治疗时的病程时间、白细胞、血红蛋白、血小板、C反应蛋白、降钙素原、离子、肝及肾功能等临床资料进行分析。结果KD合并冠脉病变组患者血白细胞、血小板计数高于无冠脉病变组,而白蛋白、羟基酸脱氢酶浓度低于无冠脉病变组,差异均有统计学意义(P<0.05)。KD发热时间<8 d患儿的冠脉病变发生率低于发热时间>10 d的患儿,差异有统计学意义(P<0.05)。病程第5天前应用IVIG治疗患者冠脉病变发生率与病程第7天、第8天及10天后治疗患者比较,差异有统计学意义(P<0.05)。病程第5天及第6天应用IVIG治疗患者的冠脉病变发生率低于病程第10天后应用的患者,差异有统计学意义(P<0.05)。结论应用IVIG时间过晚,白细胞、血小板计数升高,发热时间较长是KD患儿并发冠脉病变的危险因素,而白蛋白、羟基酸脱氢酶浓度的降低也可作为KD并发冠脉病变的预测指标。热程少于8 d,病程7 d内应用IVIG治疗,可减少冠脉病变发生率。展开更多
In this article, we develop and analyze a continuous-time Markov chain (CTMC) model to study the resurgence of dengue. We also explore the large population asymptotic behavior of probabilistic model of dengue using th...In this article, we develop and analyze a continuous-time Markov chain (CTMC) model to study the resurgence of dengue. We also explore the large population asymptotic behavior of probabilistic model of dengue using the law of large numbers (LLN). Initially, we calculate and estimate the probabilities of dengue extinction and major outbreak occurrence using multi-type Galton-Watson branching processes. Subsequently, we apply the LLN to examine the convergence of the stochastic model towards the deterministic model. Finally, theoretical numerical simulations are conducted exploration to validate our findings. Under identical conditions, our numerical results demonstrate that dengue could vanish in the stochastic model while persisting in the deterministic model. The highlighting of the law of large numbers through numerical simulations indicates from what population size a deterministic model should be considered preferable.展开更多
文摘Objective Establishing a highly sensitive real-time fluorescence quantitative PCR (qPCR) method for universal testing of epidemic African swine fever virus (ASFV) strains. Methods The ASFV p72 gene was targeted to design primer probes covering 24 p72 genotypes. The optimal amount of dimethylsulphoxide (DMSO) for qPCR amplification was determined, Various sensitivity and limit of detection (LOD) tests were performed, and clinical samples from China and imported goods were tested. Results The optimal primer-probe combination could specifically detect ASFV, 1.5% DMSO was optimal for qPCR, and LOD reached 3.2 copies/μL with good reproducibility (n = 20, p = 0.369). The method was employed to test 142 clinically suspected samples, of which 30 pig blood and 37 pig tissue samples were ASFV-positive. Moreover, the positive testing rate for ASFV was higher than for the standard qPCR method recommended by the Office International Des Epizooties (OIE), and for the commercially available kit. Thus, our method is superior for testing weakly positive samples with low virus titre, and epidemic strains present in imported goods. Conclusion Our method could be employed for universal testing of epidemic ASFV strains worldwide, ensuring wider coverage of hosts and ASFV strains/endemic strains, reducing false<span style="font-family:;" "=""> </span><span style="font-family:Verdana;">negatives, and benefitting early diagnosis.</span>
文摘目的探讨静脉注射人免疫球蛋白(intravenous infusion of human immunoglobulin,IVIG)对川崎病(Kawasaki disease,KD)患儿冠状动脉(冠脉)病变发生的影响。方法选择2019年1月至2022年5月在东莞市妇幼保健院住院确诊并治疗的KD患儿,根据有无冠脉病变将患儿分为无冠脉病变组和冠脉病变组。对两组患者的发热时间、IVIG治疗时的病程时间、白细胞、血红蛋白、血小板、C反应蛋白、降钙素原、离子、肝及肾功能等临床资料进行分析。结果KD合并冠脉病变组患者血白细胞、血小板计数高于无冠脉病变组,而白蛋白、羟基酸脱氢酶浓度低于无冠脉病变组,差异均有统计学意义(P<0.05)。KD发热时间<8 d患儿的冠脉病变发生率低于发热时间>10 d的患儿,差异有统计学意义(P<0.05)。病程第5天前应用IVIG治疗患者冠脉病变发生率与病程第7天、第8天及10天后治疗患者比较,差异有统计学意义(P<0.05)。病程第5天及第6天应用IVIG治疗患者的冠脉病变发生率低于病程第10天后应用的患者,差异有统计学意义(P<0.05)。结论应用IVIG时间过晚,白细胞、血小板计数升高,发热时间较长是KD患儿并发冠脉病变的危险因素,而白蛋白、羟基酸脱氢酶浓度的降低也可作为KD并发冠脉病变的预测指标。热程少于8 d,病程7 d内应用IVIG治疗,可减少冠脉病变发生率。
文摘In this article, we develop and analyze a continuous-time Markov chain (CTMC) model to study the resurgence of dengue. We also explore the large population asymptotic behavior of probabilistic model of dengue using the law of large numbers (LLN). Initially, we calculate and estimate the probabilities of dengue extinction and major outbreak occurrence using multi-type Galton-Watson branching processes. Subsequently, we apply the LLN to examine the convergence of the stochastic model towards the deterministic model. Finally, theoretical numerical simulations are conducted exploration to validate our findings. Under identical conditions, our numerical results demonstrate that dengue could vanish in the stochastic model while persisting in the deterministic model. The highlighting of the law of large numbers through numerical simulations indicates from what population size a deterministic model should be considered preferable.
