猪猪侠 发表于 2011-9-5 21:35:07

艾滋病N亚型

看了吴炎关于N亚型的文章一直很担心,这几天有时间亲自上网搜了一下文献,得到结论如下:
1、第一例N亚型的发现与吴炎说的基本一致,95年发现,98年报导,为一喀麦隆妇女,病毒株为YBF30,文献为Identification of a new human immunodeficiency virus type 1 distinct from group M and group O,但因只能看到摘要,初筛是否阳性未知,有兴趣的朋友可以查找全文,但本人认为是否阳性不重要,因为当时的试剂可能为二代。
2、之后用YBF30做成试剂在700份阳性血样中筛查,又发现一例。
3、97-99年(2000年报导)在6500份(也有文献说是20000份)阳性血样中,发现了五例,病毒株为YBF105,YBF106,、115 、 116,YBF117,都来自于喀麦隆中部(All known cases of HIV-1 group N infections were detected in individuals originating from central Cameroon)(Briefly, more than 20 000 sera collected between 1997 and 1999 were tested at the Centre Pasteur laboratory in Yaoundé using a highly sensitive HIV-1/HIV-2 screening test based on recombinant proteins and synthetic peptides on indirect format,由indirect format可猜测此之前应都为间接法,即二代试剂)。
4、99-02年(2004年报导)在7000份阳性血样中又发现一例N亚型(血样编号02CM-DJO0131)发现于雅温得的一所医院。 5、(06年报导)一对夫妻(1131-03, 1015-04)被发现感染了N亚型,(文献Identification of HIV Type 1 Group N Infections in a Husband and Wife in Cameroon: Viral Genome Sequences Provide Evidence for Horizontal Transmission),这之前只有8例(HIV-1 group N was recently discovered and infections with this virus are rare with only eight documented cases),此为第九、十例,过程是The group N infection in the husband, 1131-03, was identified first based on seroreactivity in peptide EIAs and confirmed by PCR amplification of group N viral sequences. Subsequently the wife, 1015-04, was evaluated and confirmed to also be infected with a group N virus,先是丈夫peptide EIAs(不知道是不是通常的初筛试剂)阳性,然后是妻子,妻子未具体提及,因为只看到摘要,未知全文中对细节怎么说的。但该文中有一句话很重要,The low level of diversity between the two viral sequences provides evidence of horizontal transmission of group N from one spouse to the other.注意horizontal transmission,说明第一次证明N亚型的横向传播,不仅仅是证明通过性传播,而是横向传播,说明以前发现的病例都是从猿到人的纵向传播。
6、2006年报导第十一例02CM-DJO0135与4中提及的为同一批血样,但后来才发现,文献:HIV-1 Group N: Evidence of Ongoing Transmission in Cameroon,文中估计与4中提及的那一粒为横向传染,为夫妻之后的又一例横向传染证据,其实它应该在夫妻病例之前。
7、至此,共查到11例,第一例和夫妻那一粒吴炎有介绍,但吴炎所说的用了至少7、8种试剂在普通人群中筛查的那件事没查到。可见,对N亚型的研究是以HIV阳性为基础的。

benzij2 发表于 2012-6-10 21:24:33

看过,的确不错。谢谢楼主
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