The word contagiaras is the imperfect subjunctive form of contagiar in the second person singular. There are other translations for this conjugation.
See the full contagiar conjugation
No quería que te contagiaras.
I didn't want to get you sick.
No te entusiasmes tanto o contagiarás a los demás pacientes.
Don't jump up and down now or you'll get my other patients excited.
Definitivamente, te contagiarás pie de atleta.
And yes, you will definitely be getting athlete's foot.
Te contagiarás de sida aquí.
You're going to get AIDS in here.
¡Te contagiarás por la alegría cubana y la belleza de esta ciudad!
You will be charmed by the happy nature of the Cuban people and the beauty of this city!
Además, no contagiarás a Andy.
Besides, you're not going to give it to Andy!
De hecho no te acerques mucho o te contagiarás.
In fact, you don't have to sit so close to me if you don't want to. No, come here.
No podía dejar que contagiaras a mis estudiantes en ese entonces y tampoco lo haré ahora.
I couldn't have you infecting my students then and I certainly won't now.
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