This article mainly talks about “infected” beer, how to identify them and what to do in those hopefully rare cases; of course there’s a dash of pellicle and yeast raft eye-candy. 
There’s also some updated research on the ability of certain pathogens to survive and grow in beer, and whether or not to dump a batch with mold.
http://www.beersyndicate.com/blog/how-to-save-a-bad-batch-of-homebrew/