1) Protein cannot be infected. Protein can be infectious. What makes a protein infectious is that it is a beta form protein.
2) He could have mad cow disease from having eaten the brain of the cow king.
3) Shaking is a symptom of almost every degenerative neurological disease.
4) When you use quotes to describe something, it typically means you are using the word in a novel or not completely correct way. For instance, it would not be incorrect to say that prions are "infected" proteins. But it is incorrect to call infected proteins "prions".
5) I am pretty sure the shaking is a result of "the coolness factor".
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2) He could have mad cow disease from having eaten the brain of the cow king.
3) Shaking is a symptom of almost every degenerative neurological disease.
4) When you use quotes to describe something, it typically means you are using the word in a novel or not completely correct way. For instance, it would not be incorrect to say that prions are "infected" proteins. But it is incorrect to call infected proteins "prions".
5) I am pretty sure the shaking is a result of "the coolness factor".