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       xkcd - A Webcomic - Viral Vector Immunity (2406)
        
       Image:
 (PNG) viral_vector_immunity.png
        
       We've secretly replaced this customer's instant coffee with our
       patented substitute. Let's see what she ... uh oh, I think she
       spotted us through the window. Now she's getting something from
       the closet ... oh jeez, she has a sword! Run!!
        
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