請看這篇。“Can antibody tests tell you if a COVID-19 vaccine worked？

https://www.mdanderson.org/cancerwise/what-do-negative-positive-antibody-test-results-mean-after-a-covid-19-vaccine.h00-159459267.html

Can antibody tests determine if the COVID-19 vaccine was effective?

The Centers for Disease Control and Prevention (CDC) discourages antibody testing for assessing immunity after getting the vaccine.

A vaccinated person is very likely to get a negative result from a serology test, even if the vaccine was successful and protective. That’s because different serology tests detect antibodies to different parts of the virus.

Some tests detect antibodies to the spike protein of the virus, which are produced in response to viral infection or the vaccine. Others detect antibodies to a different part of the virus called the nucleocapsid protein, which are produced in response to infection, but not by the current vaccines.

MD Anderson’s Blood Bank uses an antibody test designed to detect antibodies to the nucleocapsid protein, which means donors who have received the COVID-19 vaccine will likely receive a negative antibody test result.

“A vaccinated person should not be alarmed or worried if they receive a negative antibody test result because this test does not detect antibodies from the Pfizer, Moderna and Johnson & Johnson’s Janssen COVID-19 vaccines, which were developed against the spike protein of the virus,” says Fernando Martinez, M.D., medical director of Laboratory Medicine. “This reinforces the guidance from the CDC that serology tests should not be used to test for immunity.”

加一篇FDA官網： https://www.fda.gov/news-events/press-announcements/fda-brief-fda-advises-against-use-sars-cov-2-antibody-test-results-evaluate-immunity-or-protection

所有跟帖： 

• 唉，誰都不湖塗，在選擇測試時當然要選能測S蛋白抗體的方法。CDC在扯皮、推委、狡辯, 沒有擔當。沒有抗體，扯什麽免疫。 -fuz- ♂ (0 bytes) () 05/23/2021 postreply 08:54:12

• 是。簡單科普就能說清楚的事情，搞得貌似高深莫測。 -TBz- ♂ (0 bytes) () 05/23/2021 postreply 09:34:14

• 覺得這新冠病毒畢竟是新的，免疫係統更是複雜，目前都屬“摸著石頭過河”，值得研究東西還很多。 -pickshell- ♀ (169 bytes) () 05/23/2021 postreply 10:12:57

• 我的態度是，打了疫苗，不會去測抗體；我也不會認為我有了金箍罩、鐵布衫，該戴口罩繼續戴口罩，也不會去人紮堆的地方。 -法眼- ♂ (0 bytes) () 05/23/2021 postreply 10:17:29

• 我也是，打疫苗看做多加層保護，沒必要就此可往“火”裏鑽。 -pickshell- ♀ (0 bytes) () 05/23/2021 postreply 10:24:53

• 打不打疫苗都當作沒打處理。 該戴必須戴，該洗手必須洗手。 -Shanghaigirl98- ♀ (0 bytes) () 05/23/2021 postreply 12:11:25