New York City released the results of about 1.5 million antibody tests this week, and they confirmed how deeply the virus affected lower-income communities. Results from wealthier neighborhoods tell a different story: NoZIP code below 96th Street in Manhattan had positive antibody results above 20 percent. 。。。
Previous antibody data has been relatively limited. An April survey by Gov. Andrew M. Cuomo’s office, which involved testing 28,419 people across the state, suggested that about 21 percent of New York City residents had antibodies to the coronavirus.
The new antibody data from the city included more than 15 percent of city residents, and showed that more than 27 percent of those tested were positive.
在世界各国,无症状感染者但没有成为病人的几乎都不算病人,因为各国几乎完全只对有病状的做
检测(只有中国有4个城市或地区--武汉、牡丹江、青岛和喀什地区---做了全民检测,还有一个城市--大连---做了一个大区的全民检
测)
到5月9日瑞士(与武汉人口相当的小地区)的抗体阳性率是11%,但是报告的病例率是
30251/8,685,818=0.348%
相差11/0.348=31.6倍
武汉的官方感染率是46342/9000000=0.51%
抗体阳性率与报告的病例率相差4.43/0.51=8.7倍
与武汉人口也是相当的纽约市
在8月做了第二次抗体检测
150万人的抗体测试阳性率高于27%
而报告的病例率on august 19是： 228,228/8,336,817=2.738%
抗体阳性率是病例率是27/27.4=9.85倍以上
这种差别可以参考流感的情况
看美国cdc的每年的多次定期报告就知道,去医院的人比例是比较低的
没去测试而被感染的人里会有本身免疫系统就杀死了病毒，也有轻症患者（各地早期都没有资源测试），更有无症状感染者还没有成为病人或者不会成为病人的。最后的这个人群有可能会成为对他人的感染源，很难被发现，是最令人头疼的。
http://m.chinacdc.cn/jkzt/crb/yl/hrb_11806/zstd_9200/202012/t20201228_223494.html
https://www.worldometers.info/coronavirus/country/belgium/
http://wjw.hubei.gov.cn/bmdt/ztzl/fkxxgzbdgrfyyq/xxfb/202004/t20200418_2234341.shtml
武汉市46342例
http://www.nbd.com.cn/articles/2020-01-26/1403142.html
26日晚，湖北省人民政府新闻办公室就新型冠状病毒感染的肺炎疫情防控工作召开新闻发布会，武汉市长周先旺今日表示，因为春节和疫情的影响，目前有500多万人离开武
汉，还有900万人留在城里。
https://en.wikipedia.org/wiki/New_York_City
• Estimate (2019)[7] 8,336,817
https://en.wikipedia.org/wiki/COVID-19_pandemic_in_New_York_City#August
https://www1.nyc.gov/site/doh/covid/covid-19-data-totals.page#antibody
https://www.nytimes.com/2020/08/20/nyregion/nyc-coronavirus-antibody-testing.html
Aug. 20, 2020
New York City released the results of about 1.5 million antibody tests this
week, and they confirmed how deeply the virus affected lower-income
communities. Results from wealthier neighborhoods tell a different story: NoZIP code below 96th Street in Manhattan had positive antibody results above
20 percent.
。。。
Previous antibody data has been relatively limited. An April survey by Gov.
Andrew M. Cuomo’s office, which involved testing 28,419 people across the
state, suggested that about 21 percent of New York City residents had
antibodies to the coronavirus.
The new antibody data from the city included more than 15 percent of city
residents, and showed that more than 27 percent of those tested were
positive.
你没有关注过二月份的武汉，那时候武汉是阳性就算，如果不是阳性只要有症状就去照CT，有大白肺就算，比什么美国标准严格得多
现在的数据不是说无症状者不传染吗？还有人说真的无症状比率没有80%那么高，只有
10-20%.
【 在 xiangpiqiu (像皮球) 的大作中提到: 】
: 你没有关注过二月份的武汉，那时候武汉是阳性就算，如果不是阳性只要有症状就去照
: CT，有大白肺就算，比什么美国标准严格得多
2月份已经是应收尽收
但是1月份还是漏掉不少的
开始至少好几个星期，美国更严重，轻症都不给测
现在就很不错了，我今天去east palo alto的home depot看到2个带箭头的牌子上写着
free covid-19 testing！county有定期的免费testing，但是都是固定日期的。
有的无症状感染者可以发展成病人
中国发现的无症状感染者会被隔离