Yes.  Although I prefer to reference it as fact over theory.
Afterall, through the great works of Antoine Béchamp in correlation with 300 years of 'germ theory' and vaccine history, we know this strong evidence packs a mean punch!  Look into the works of Peter Duesberg, Thomas Cowan, and
 Jon Rappaport for more sound evidence.
I'll post a great documentary on the subject shortly.