How is immunity passed from one person to another in natural passive immunity?

Hello, on my college work ive wrote 'natural immunity is created by the bodies natural barriers. It is when immunity is passed from one person to anther'. However, my teacher has wrote 'antibodies and how is it passed' next to it, i dont know what she means by 'antibodies' but i was... show more Hello, on my college work ive wrote 'natural immunity is created by the bodies natural barriers. It is when immunity is passed from one person to anther'. However, my teacher has wrote 'antibodies and how is it passed' next to it, i dont know what she means by 'antibodies' but i was wondering if you could tell me how it is passed from one person to another as i have no clue!

thankyou!
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