2021年冬季江苏省常熟市成年人患者呼吸道鼻病毒感染分析

目的 了解2021年冬季江苏省常熟市成年人呼吸道感染者的病毒流行情况和鼻病毒的感染种类及型别。方法 采集江苏省常熟市门诊与呼吸道感染住院成年人患者的咽拭子样本,采用实时荧光定量聚合酶链式反应（PCR）方法开展15种常见呼吸道病毒检测;扩增鼻病毒VP4-VP2基因测序,以MEGA 7.0软件对获取序列进行系统发育分析与同源性分析。结果 共收集咽拭子样本333份,检出病毒阳性样本120份,阳性检出率为36.04%,其中人鼻病毒（human rhinovirus, HRV）检出样本数占阳性样本的28.33%(34/120),检出率最高,其次是腺病毒22.50%(27/120)和乙型流感病毒15.83%(19/120)。以单一病毒感染为主,占83.33%(100/120);混合感染以2种病毒为主80%(16/20),3种病毒共感染仅有4份。34份鼻病毒感染样本中成功扩增出32条条带,比对分析发现涉及20种血清型,分属于HRV-A(19株)、HRV-B(9株)和HRV-C(4株)3种。结论 HRV是2021年冬季江苏省常熟市成年人呼吸道感染的主要病原体之一,存在HRV-A、HRV-B、HRV-C...     

Influence of cell cycle on HIV-1 expression differsamong various models of chronic infection

Summary.  Because of an inherent dependence on host cell second and third messenger signaling pathways for activation of HIV-1 expression, a potential exists for a relationship between the induction of latent HIV-1 and cell-cycle-related events. To investigate this potential relationship, cellular models of latent HIV-1 infection (OM-10.1 promyelocytes, ACH-2 T-lymphocytes, and U1 promonocytes) were chemically treated or γ-irradiated to synchronize cultures at each cell cycle stage and then examined for constitutive and TNF-α-induced HIV-1 expression. Cell cycle synchronization alone had no effect on HIV-1 expression in OM-10.1 and U1 cultures; whereas enhanced constitutive HIV-1 expression was observed in ACH-2 cultures at . A 2 hour TNF-α treatment of all synchronized OM-10.1 cultures activated HIV-1 expression to a similar extent as unsynchronized cultures. In contrast, the extent of TNF-α-induced HIV-1 expression in ACH-2 S and cultures and in the Ul G₀/G₁ culture was greater than that in unsynchronized control cultures. However, no delay in the initial response was observed. Thus, the influence of cell cycle on constitutive and induced HIV-1 expression varied in each cellular model and, therefore, may further relate to the different molecular mechanisms maintaining viral latency. Received November 6, 1996 Accepted January 15, 1997     

云南省梁河县鼠疫疫源地野外鼠形动物嗜吞噬细胞无形体感染调查

目的 了解云南省梁河县鼠疫疫源地野外鼠形动物嗜吞噬细胞无形体自然感染情况。方法 应用单纯随机抽样法,从665份野外鼠形动物肝脾标本中抽取407份,采用巢式PCR对样本进行嗜吞噬细胞无形体16SrRNA基因检测,并对扩增产物测序,应用生物软件MEGA7.0将所测序列与GenBank注册的其它无形体属种株进行序列对比分析。结果 检测野外鼠形动物3目5科12属17种407只,阳性率为3.19%(13/407),其中大足鼠、黄胸鼠和斯氏家鼠阳性率分别为21.43%(3/14)、6.00%(6/100)和4.94%(4/81),其它鼠形动物均未检测出阳性;不同海拔梯度(P=0.219)、不同性别(χ²=0.441,P=0.506)及不同生境间(χ²=0.386,P=0.534)鼠形动物嗜吞噬细胞无形体感染率差异无统计学意义;不同季节野外鼠形动物嗜吞噬细胞无形体感染率差异具有统计学意义(P=0.044);序列对比分析显示所有样本基因序列与GenBank中收录的国内外部分嗜吞噬细胞无形体16SrRNA基因序列同源性达100%,进化分析显示与国内外部分嗜吞噬细胞无形体处同一个分支。结论 云南省梁河县鼠疫疫源地野外鼠形动物存在嗜吞噬细胞无形体低度感染。