DTaP Immunization

I have become increasingly concerned about my 3 month old and exposure to Whooping Cough.  I haven't had him vaccinated at all and would rather not, but there have been a number of people with Pertussis in my state lately and I'm worried about the possible risk to my son.  I do not want to vaccinate him because of the health risks from the vaccine but I don't know which is worse.