Seeing as the MMR vaccine is a live vaccine and can shed for up to 3 weeks….how do they know that one kid spurred it all? The are blaming one person solely on the fact that he wasn’t vaccinated and the anti-vaccine movement is growing. Just because he went to Europe recently does not mean he carried it back with him. Where is the proof of that? He could have caught it from someone who was recently vaccinated and was shedding the vaccine. Correlation is NOT causation.