Un agent infectieux et un sujet receptif

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fatal lullaby

France - French
I am trying to translate a medical article about hospital-aquired infections, and there is a sentence I don't manage to translate completely on my own :

"(...) et le développement de l'infection nécessite trois éléments : un mode de transmission, un agent infectieux et un sujet réceptif (...)"

The beginning of the sentence is OK, but I don't know what to do with the end. I have tried and found "an infectious agent and a receptive patient"...
Would that be right? I am absolutely not sure that it makes a sense...

Could you please help me?
Thank you very much!
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