A positive test result shows you may have antibodies from an infection with the virus that causes COVID-19. However, there is a chance a positive result means that you have antibodies from an infection with a virus from the same family of viruses (called coronaviruses), such as the one that causes the common cold
A positive test result shows you may have antibodies from an infection with the virus that causes COVID-19. However, there is a chance a positive result means that you have antibodies from an infection with a virus from the same family of viruses (called coronaviruses), such as the one that causes the common cold.
https://www.webmd.com/cold-and-flu/common_cold_overview
CDC 说新冠病毒抗体检测阳性可能是普通感冒病毒造成的抗体。小孩一年会得六到十次，年纪越大越不会得普通感冒。六十岁以上老人一年可能没有一次。如果普通感冒病毒造成的抗体也有对抗新冠病毒的作用，这可以解释为什么老人得新冠病毒死亡率这么高。而幼儿不会死。
不能只看相关性，比如老年人累计盐吃的多。这个推论未必错，重要的是有无实验支持：1.感冒抗体有抗新冠作用；2. 老年人死亡率高的原因（之一？）是感冒抗体多。
新冠疫苗的重要指标，是产生抗新冠抗体，......
1) 新冠病毒抗体不等于是免疫抗体。感冒病毒有很多不同种类，此次新冠病毒也不等同于普通感冒，传播强度和毒性都不同。
2）老年人新冠病毒死亡率高，是因为本身就有基础病，病毒会引发多种并发症，扛不过去。
跟没逻辑的人讲话，忒累。
hypothesis
你的定义是什么？
这传染源本来是很简单的概念，你们怎么都不明白？
传染源
传播途径
预感人群
唉，你概念太乱不同东东被你搅合成一锅，算了不跟你说了，
不知道你们逻辑有没有学过。只会批评我却没有逻辑。
A positive test result shows you may have antibodies from an infection with the virus that causes COVID-19. However, there is a chance a positive result means that you have antibodies from an infection with a virus from the same family of viruses (called coronaviruses), such as the one that causes the common cold
from the same family of viruses (called coronaviruses), such as the one that causes the common cold.
A positive test result shows you may have antibodies from an infection with the virus that causes COVID-19. However, there is a chance a positive result means that you have antibodies from an infection with a virus from the same family of viruses (called coronaviruses), such as the one that causes the common cold.
因老爸有胡子，所以你把世上但凡长胡子的都叫爸。这就是你的理解和逻辑。