Zero. The PR industry has mass persuaded people to believe that the natural, balanced, innate immune system is defective and that you must "fix" it with vaccines. They created the illusion that vaccines are your one and only option for fighting diseases. They manipulated the herd by leading them to believe there are zero other options for fighting diseases.
The illusions that were created by and programmed by the PR Industry have successfully hidden many effective methods of fighting diseases that cause no harm and that cause no side effects. Of course those effective methods have zero $commercial$ value.
There are no risks whatsoever for not vaccinating.