Characterization and phylogenetic analysis of a neurovirulent Zika virus isolated from Cambodia in 2019

The geographic range of Zika virus (ZIKV) has expanded from Asia to the Americas, leading to the 2015–2016 pandemic with enhanced neurovirulence. At present, ZIKV is continuously circulating in many Southeast Asian countries. Unfortunately, the persistent evolution of ZIKV in Southeast Asia and its influence on the biological characteristics of the virus remain incompletely understood. In this study, the in vitro and in vivo properties of a new ZIKV isolate obtained from Cambodia in 2019 (CAM/2019) were characterized and compared with those of the Cambodian strain (CAM/2010). Compared with CAM/2010, the CAM/2019 virus showed similar plaque morphology and growth curves in cell cultures and induced comparable viremia and organ viral loads profiles in both BALB/c and A129 (IFNAR1^−/−) mice upon intraperitoneal (i.p.) inoculation. Remarkably, the CAM/2019 virus exhibited enhanced neurovirulence in neonatal mice compared with CAM/2010, with a 74-fold reduction in the 50% lethal dose (LD₅₀). Consistently, CAM/2019 produced higher viral loads in the brains of BALB/c neonatal mice than CAM/2010 did. Sequence alignment showed that the CAM/2019 virus has acquired 12 amino acid substitutions, several of which were found to be associated with neurovirulence. In particular, the CAM/2019 virus shared an A1204T substitution in NS2A with the Thai isolate SI-BKK02 that was isolated from a microcephaly case. Taken together, our results indicate that a ZIKV strain isolated with specific mutations has emerged in Cambodia, highlighting the need for extensive molecular and disease surveillance in Cambodia and other Asian countries.     

Screening and identification of 3-aryl-quinolin-2-one derivatives as antiviral agents against influenza A

Quinolin-2-one represents an important and valuable chemical motif that possesses a wide variety of biological activities; however, the anti-influenza activities of quinolin-2-one-containing compounds were rarely reported. Herein, we describe the screening and identification of 3-aryl-quinolin-2-one derivatives as a novel class of antiviral agents. The 3-aryl-quinolinone derivatives were synthesized via an efficient copper-catalyzed reaction cascade that we previously developed. Using this synthetic method, preliminary structure–activity relationships of this scaffold against the influenza A virus infection were systematically explored. The most potent compound 34 displayed IC₅₀ values of 2.14 and 4.88 μM against the replication of H3N2 (A/HK/8/68) and H1N1 (A/WSN/33) strains, respectively, without apparent cytotoxicity on MDCK cells. We further demonstrated that 27 and 34 potently inhibited the plaque formation of the IAV, rendering this scaffold attractive for pursuing novel anti-influenza agents.     

痢疾杆菌R质粒的检测、消除及药物敏感试验

目的：探讨得疾杆菌的耐药性。方法：采用Ｋ－Ｂ法测定痢疾杆菌的耐药谱,对耐药菌株进行Ｒ闰的检测及接合传递人工诱导痢疾杆功秋稳定Ｌ型,观察Ｒ质粒丢失情况。结果：４５株痢疾杆菌４４经,耐药率９７．８％,其中三重耐药菌株占９３．２％,四重以上耐药菌株占７３．３％。８８．９％（４０／４５）的菌株检测出Ｒ质粒,质粒的接合传递率为６１．４％。痢疾杆菌Ｌ型未见质粒丢失。结论：痢疾杆菌的耐药性十分严重,自由质粒控制     

Effect of intranasal structure-normalizing surgery on allergic rhinitis: A primary report of 41 cases

The heatment of allergic rhinitis is yet qUite a challeopng and intrigUing Pchem, and there has not beeneradicable modality. Dings often relieve symptomS tempowhly. Selechve nerve block surgerys such as section andelectroCauterization of Vidian nerve, anterior ethlnoidalnerve and sphenoplatine nerve, have brought us a newProspect, but long-term results still need checking andthey are not considend to be adopted until Ph~otherapy and ilnlnunotherapy come to failu.[l]. Clinically, allergic rh…     

PTF—V1在二尖瓣狭窄球囊扩张术中的临床效果分析

目的 探讨二尖瓣狭窄患者行经皮二尖瓣球囊扩张术（ＰＢＭＶ０前后心电图ＰＴＦ－Ｖ１的变化及其与血流动力学各指标的相关性。方法 分析２９例窦性心律的二尖瓣狭窄患者ＰＢＭＶ前后ＰＴＦ－Ｖ１的变化,并与二尖瓣面积（ＭＶＡ）、左房平均压（ＭＬＡＰ）和左房内径（ＬＡＤ）作相关分析。结果 ＰＢＭＶ术后ＰＴＦ－Ｖ１显著改善（Ｐ〈０．０１）,与ＭＬＡＰ、ＬＡＤ呈显著正相关,与ＭＶＡ呈显著负相关（Ｐ〈０．０５）。结论     

脐血临床应用前的实验研究

对５８例脐血红细胞进行了计数和血红蛋白含量测定,并测定乙肝两对半、丙肝抗体、人类免疫缺陷病毒抗体、肝功能及Ｔ细胞亚群分类和细菌培养。结果表明无传染病的正常孕妇分娩时的脐血,可作血源供临床使用并能用于治疗多种原因引起的贫血。     

心理因素在神经性皮炎发病中的作用

用艾森克个性量表对１２５例神经性皮炎患者和１３４例健康志愿者进行心理测试。结果显示,神经性皮炎患者有明显的内倾性－ＥＰＱ－Ｅ分值明显低于对照组（ｔ＝４．５９５,Ｐ〈０．０１）,并且情绪稳定性较低－ＥＰＱ－Ｎ分值明显高于对照组（ｔ＝６．２４５,Ｐ〈０．０１）。结论：社会心理因素在神经性皮炎发病中起重要作用。     

人肝癌细胞系HCC-9724的建立及其生物学特性

目的 建立一株肝癌细胞系ＨＣＣ－９７２４,为肝癌研究提供实验模型。方法 无菌切除肝癌手术标本,６只裸鼠右后肢皮下包埋,体内连续传３代后,取移植瘤体外培养,绘制细胞生长曲线,光镜、电镜观察细胞形态,并进行细胞周期和染铎体核形分析,用免疫荧光法测定荷瘤鼠中ＡＦＰ的表达,结果 移植模型原代获得率为３３．３％,潜伏期为５２ｄ,自第３代后肿瘤获得率为１００．０％,潜伏期为１６ｄ,该模型移植瘤具有生长,稳定,     

综合疗法治愈狼疮性急性肾衰1例

1　病例报告　患者 ,女 ,6 0岁 ,因反复发热 2 5 a、全身性关节疼痛 2 3 a,双下肢水肿 2 mo,腹胀、尿少 1mo,于 1998- 10 - 2 0入院 .1975年患者出现发热 ,全身关节疼痛 ,四肢关节周围皮肤出现结节性红斑 ,触之疼痛 ,多次化验血沉 115 mm· h- 1 ,抗核抗体阴性 ,类风湿因子阳性 ,未找到狼疮细胞 ,诊断为“类风湿性关节炎”.1986年因上述症状复发再次入我院 ,多次检查后发现血抗核抗体 ( ) ,抗双链 DNA抗体 ( ) ,临床确诊为系统性红斑狼疮 (SL E) ,狼疮性肝炎 ,狼疮性胸膜炎 ,狼疮性肺炎 .经治疗好转 ,但上述症状反复发作 .此次上述症状复…