專家A：「你的抗體水平已經減少到喪失保護力的程度，需要每年接種加強劑。」
專家B：「我們的免疫系統不是這麼設計的，你不能長期維持高抗體水平，否則你啲血會杰到阿媽都唔認得。即使你的抗體處於低水平，一旦接觸病毒，聰明的記憶B細胞會在幾天之內大量製造新抗體。」
A+B：「高水平又得，低水平亦得，得咗！」
//"This isn't a glitch," said Dr. Monica Gandhi, professor of medicine and associate division chief of the Division of HIV, Infectious Diseases, and Global Medicine at University of California San Francisco and San Francisco General Hospital.
"This is how the immune system is designed," she explained. "It's normal for immunoglobulins to reduce over time." She said our blood and our noses can't hold all of the antibodies they've ever produced; if antibody levels didn't drop, "our blood would be thick as paste."
And as our antibodies wane in places like our nose, where the virus might enter our body, Gandhi said we might be more susceptible to mild infection.
"So it really is not really a function of the vaccine; it has to do with this is how our immune systems work," she said.
At the same time though, our immune system is pretty smart and resourceful; it contains cells such as memory B cells that will start churning out new antibodies within days of encountering a familiar virus or bacteria.//
在疫苗刺激後，抗體長期處於高水平，是否反映免疫系統失調？
我現在漸漸明白為何在10年前起高中生物學大刪免疫學的部分。
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