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OpenStudy (anonymous):

Which item must be passed from person to person in order to acquire an infectious disease? pathogen saliva antigen blood

OpenStudy (sleepyjess):

Hello! Welcome to OpenStudy! This would probably fit better in the \({\href{http:///openstudy.com/study#/groups/Biology}{\bf \color{red}{Biology}}}\) section http://openstudy.com/study#/groups/Biology

OpenStudy (anonymous):

is C for sure.

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