"And I only am escaped alone to tell thee"

Fun dream from my morning nap today - the final log of an engineer, the last survivor of an expedition from something very like the Federation, but even more multi-cultural and multi-species, that accidentally dug up an aggressive hive-mind entity (like the Borg or Vinge's Blight) that looks like pink mist (nanite cloud?), assimilates/overwrites others, and infects rapidly by touch. At the moment, he's literally half the "man" he used to be; he violently severed his lower half in an attempt to prevent infection, but it got into him anyway. Now he's just trying to hang on long enough to finish his account of what happened/warning to others, hoping that it'll be enough.