新冠病毒变体：基本须知
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0:00 - 0:03随着新冠疫情的继续
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0:03 - 0:06病毒变异已成为最为关注的问题
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0:06 - 0:10例如在南非、巴西和英国
都有显著的病例 -
0:10 - 0:13但病毒变异很复杂
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0:13 - 0:16每个都由一系列突变组成
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0:16 - 0:20所有这些都有可能以意想不到的方式
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0:20 - 0:22改变 SARS-CoV-2 病毒
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0:22 - 0:26那么科学家谈论的变体是什么意思？
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0:26 - 0:30这对新冠疫情的未来意味着什么？
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0:31 - 0:35病毒通过反复复制基因组来繁殖
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0:35 - 0:39但就像一台旧的复印机
这些副本并不总是完美的 -
0:39 - 0:42每个不完美的副本都是一个变体
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0:43 - 0:48通常这些有缺陷的副本或突变
不会改变病毒的行为方式 -
0:48 - 0:51而且通常比最初的病毒弱
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0:52 - 0:54但在极少数情况下
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0:54 - 0:57突变可以改变病毒的一些重要的行为
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0:57 - 0:59比如传染性更强
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0:59 - 1:02或者更能躲避免疫系统
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1:03 - 1:06病毒不受限制地复制的次数越多
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1:06 - 1:10积累这些罕见的
有益突变的机会就越大 -
1:11 - 1:14当病毒在人群中快速传播
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1:14 - 1:17或者遇到不太能与他们作战的宿主
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1:17 - 1:20例如因医疗而免疫系统受损的人
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1:20 - 1:22或 HIV+ 携带者
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1:22 - 1:25就会发生这种情况
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1:25 - 1:29如果一组特定突变使变体很稳定
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1:29 - 1:31它可能会变得比其他的更突出
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1:31 - 1:34这时人们就会注意到它
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- Title:
- 新冠病毒变体：基本须知
- Description:
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more » « less
- Video Language:
- English
- Team:
Amplifying Voices
- Project:
- COVID-19 Pandemic
- Duration:
- 05:50
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