出现抗体表示对某个个别的食物不会产生特殊反应。
The presence of antibodies indicates an immune response to a specific food.
看，这就是抗体的作用，它们在那里杀死细菌，杀死病毒，或者，它们可能会对过敏原作出反应。
They are there to kill germs, kill viruses. Or,they might react to an allergen.
但是如果在感染之前就有这些抗体，免疫系统的反应可能会不同。
But the immune system could react differently if it had these antibodies before infection.
但是如果在感染之前就有这些抗体，免疫系统的反应可能会不同。
But the immune system could react differently if it had these antibodies before infection.
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