至於冠狀病毒，以下是直接感染後，免疫力消失的研究。 https://www.npr.org/sections/goatsandsoda/2020/03/20/819038431/do-you-get-immunity-after-recovering-from-a-case-of-coronavirus 截文： Researchers do know that reinfection is an issue with the four seasonal coronaviruses that cause about 10 to 30% of common colds. These coronaviruses seem to be able to sicken people again and again, even though people have been exposed to them since childhood. "Almost everybody walking around, if you were to test their blood right now, they would have some levels of antibody to the four different coronaviruses that are known," says Ann Falsey of the University of Rochester Medical Center. After infection with one of these viruses, she says, antibodies are produced but then the levels slowly decline and people become susceptible again.
很多州还是不测轻症呢。
早着呢，三周后顶峰。就是现在的意大利的样子。 但是，意大利没有打砸抢杀人， 美国都会出现。
所以你要注意安全啊
阳性率多少预示顶峰？
活捉造谣粉红一枚
好問題！基本是RNA 病毒抗體的特性，注射疫苗或是自然感染，自體抗體都會逐漸衰減，疫苗產生的抗體根據是減低毒性病毒或是死病毒，抗體衰減速率不同。 下圖是感冒疫苗有效性衰減曲線。
至於冠狀病毒，以下是直接感染後，免疫力消失的研究。
https://www.npr.org/sections/goatsandsoda/2020/03/20/819038431/do-you-get-immunity-after-recovering-from-a-case-of-coronavirus
截文： Researchers do know that reinfection is an issue with the four seasonal coronaviruses that cause about 10 to 30% of common colds. These coronaviruses seem to be able to sicken people again and again, even though people have been exposed to them since childhood. "Almost everybody walking around, if you were to test their blood right now, they would have some levels of antibody to the four different coronaviruses that are known," says Ann Falsey of the University of Rochester Medical Center. After infection with one of these viruses, she says, antibodies are produced but then the levels slowly decline and people become susceptible again.
照目前曲线，本周六二十七万左右
肯定没有啊，我们麻州这里还没放开测呢。
确实看到有几个州新闻说轻症不测了，不知道是不是这样
当然是真的