Here is the predictable part: ``... the immunological basis of such reactions is unclear, and it is possible that such apparent associations with vaccination may be due to coincident disease development, particularly in young animals». (dogsnaturallymagazine.com)
Dr. Francis and others have shown apparent association of the two in a few papers, such as Francis and Vavrus, 2012: (realclimate.org)
They noted that confirmation through other studies was needed before such a link could be said to be established, and they cautioned that in the history of schizophrenia research, many apparent associations had eventually proved spurious or impossible to replicate. (schizophrenia.com)