here is the actual study http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1002198 I actually saw something similar (but not identical) to this when I managed boarding kennels with the kennel cough vaccine. Dogs who developed vaccine induced kennel cough (within 14 days of being vaccinated) would be highly contagious and the variety of KC they spread was many times more contagious and severe than naturally contracted Kc
