Diagnostic image (30). Aortic dissection type B

An 81-year-old man with acute back pain had a dissection of the aorta abdominalis (type B).     

O139型霍乱菌苗人群副反应观察报告

在广西田阳县中学生中，分６组共６９７人进行了Ｏ１３９型霍乱菌苗与Ｏ１群霍乱菌苗的双讯有对照的人体反应现场观察。结果表明，不加铝佐剂的Ｏ１３９型霍乱菌苗及Ｏ１群霍乱菌苗，不论是低剂量组（两剂全程接种４５亿菌体）还是常剂量组（全程接种９０亿）接咱人群均可产生１０－２５％的体温呈轻度升高的弱反应，并且同种菌苗的两一的反应率无显著差异；第一剂接种的反应率（１９－２５％）较第二剂接处的（１０－１５％）高（Ｐ     

致死性侏儒症Ⅰ型高发突变发生机制浅析

致死性侏儒症(thanatophoric dysplasia,TD)是重型短肢畸形病中相对常见的致死性遗传性骨病,分为TD-I和TD-II 2型,它们都是由于FGFR3基因发生致死突变所致。TD-I型存在多种致病性突变,其中以c.742C>T/p.R248C突变最为常见。本病为常染色体显性遗传(autosomal dominant,AD),杂合突变即可致死,但为何表型、基因型正常的父母会生出带有p.R248C突变的患胎并且是纯合突变的死胎?如果是新生突变,又为何会接连数胎生出同样的患胎?p.R248C高发突变的机制是什么?本文重点围绕这些问题,从"FGFR3(Fibroblast growth factor receptor 3)基因和FGFR3受体(Fibroblast growth factor receptor 3)的结构和功能,TD-I型p.R248C高发突变的发生机制,正常父母生出纯合致死突变的可能机制"几方面进行剖析,指出:(1)FGFR3基因及其受体蛋白结构和功能的特殊性是高发突变发生的物质基础;(2)位于IgⅡ和IgⅢ结构域连接区的氨基酸是极性很强的亲水氨基酸,很容易与带电离子结合而影响α螺旋结构,故易受外来理化因素的攻击、诱变而发生改变;(3)正常父母生出纯合致死突变,推测有两种可能:一种是夫妇一方的生殖腺已带有该高发突变,当胎儿从亲代遗传了一次突变后,只需在另一位点上再发生一次新生突变即可产生;另一种是夫妇双方的生殖腺都是该突变的嵌合体,当两者结合在一起,就有可能产生纯合突变。此外,还对未来发展趋势进行了展望。本文旨在探讨c.742C>T/p.R248C高发突变和纯合突变发生的机制,进而为其今后的诊断和防治工作提供理论依据。     

Laboratory characteristics of an attenuated influenza type A (H3N2) virus ('Alice' strain).

The Alice strain of live attenuated influenza virus was obtained by selection of a gamma inhibitor-resistant strain from a virus recombinant between A/PR/8/34 (HON1) and A/England/42/72 (H3N2). Its behaviour in vitro and in vivo was studied. Three marker systems were investigated: resistance to serum inhibitors, growth capacity at high temperature and low sensitivity to amantadine hydrochloride. In ferrets the strain was found to be attenuated and immunogenic. Passages in man, animals and eggs have not affected its resistance to gamma inhibitors.     

Laboratory characteristics of an attenuated influenza type A (H3N2) virus ('Alice' strain).

The Alice strain of live attenuated influenza virus was obtained by selection of a gamma inhibitor-resistant strain from a virus recombinant between A/PR/8/34 (HON1) and A/England/42/72 (H3N2). Its behaviour in vitro and in vivo was studied. Three marker systems were investigated: resistance to serum inhibitors, growth capacity at high temperature and low sensitivity to amantadine hydrochloride. In ferrets the strain was found to be attenuated and immunogenic. Passages in man, animals and eggs have not affected its resistance to gamma inhibitors.     

Epidemiologic assessment of screening tests for antibody to human T lymphotropic virus type I (HTLV-I).

We tested 196 sera from a human T lymphotropic virus type I (HTLV-I) risk group (prostitute women) with two commercial "research" enzyme-linked immunoabsorbent assays (EIA) for HTLV-I antibodies. All tested sera were characterized by HTLV-I Western immunoblots and by HTLV-I radioimmunoprecipitation assays. The estimated sensitivities of the EIA tests were 93.8 percent and 100 percent, and the specificities were 98.8 percent and 95.8 percent, respectively, using recommended criteria for seropositivity (requiring reactivity to both gag p24 and env gp46 or gp61/68). Calculated negative predictive values remained excellent (greater than 99.9 percent and 100 percent, respectively) at lower seroprevalence rates but the positive predictive values were only 7.3 percent and 2.3 percent when calculated for a seroprevalence rate of 0.1 percent. These results emphasize the importance and need for additional HTLV-I supplementary serologic testing when screening populations with low HTLV-I seroprevalence rates.