Answer: authentic and allows it to be taken seriously.
In this excerpt, we find a lot of jargon related to the way people deal with contamination in medical and military settings. Although most readers would be unaware of whether the jargon is real or not, the use of this vocabulary makes the text sound more authentic. Therefore, it is easier for the reader to take the text, and the author, seriously, and to assume that he knows what he is talking about.