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作者:电竞投注平台_电竞竞猜app更新时间:2020-10-27 14:47:12

font-weight:normal他注意到:在动物群种中,一种新型病毒首次感染会覆盖各个年龄段的个体,同时某些个体由于遗传差异或从其它相似疾病中偶然获得免疫力而成为幸存者牛牛游戏网站_牛牛游戏appcolor:#333font-size:20pxbackground:url(http://static.ws.126.net/news/2017/3/31/2017033115083911b86.jpg)leftcenterno-repeat

寄生物后续会对动物物种的年幼一代不利,这往往会清除弱小的变种,并使种群逐步对这种特殊形式的传染源具有更强的抵抗力(84页)font-family:"MicrosoftYahei"牛牛游戏网站_牛牛游戏appmargin-bottom:20px因而“传染病并不是静态存在,而是由寄生物与被入侵物种之间不断变化关系决定的,这种变化必将导致临床和流行病学表现的变化(105页)”text-decoration:none

padding-left:10px}#endText.part{border-bottom:1pxsolid#e2e2e2牛牛游戏网站_牛牛游戏app他还以梅毒为例对上述规律加以解释font-family:"宋体"margin-bottom:5px

笔者把这个看法理解为:特定传染病的流行度——如流行时间长度与普遍程度,会在过程中与其致病率及致命性之间演化出某种反向关系line-height:15px牛牛游戏网站_牛牛游戏apppadding-bottom:10px这个看法对后来研究者提出的“疾病相对免疫力”、“疾病梯度”等概念,提供了某种发生学意义上的解释,对疾病社会史研究具有方法论层面启示意义}#endText.partullia{color:#333

}#endText.part.no-border{border-bottom:0或许与作者曾在战场担任军医官的经历有关,该书一大特色是对西方战争史上疾病产生重要影响的战案收罗颇丰,并通过分析这些案例说明疾病与战争存在不解之缘的道理:战争环境下,士兵受营养不良、饿饭挨饥、困乏疲惫和恶劣气候等因素困扰抵抗力下降,从而给传染病爆发提供适宜土壤,军队组织固有的大量人群聚集特定又给疫情扩散提供便利条件牛牛游戏网站_牛牛游戏app}#endText.partul{margin-top:30px作者甚至认为:“行军、射击和作战策略不过是战争这场悲剧中很小的一部分,是侥幸逃出军营流行病魔掌的残余力量所开展的最后行动float:left

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