Please read this and tell me what you would do.?

i have a 3 1/2 year old little girl that has had every one of the shots and she is perfectly healthy. I also just lost my son who was 2 day away from his 2 month birthday and he had not received that shot at all. My son died of SIDS so that shot had nothing to do with it. i would trust the babies doctor and if you have any questions i would print out that report and ask the doctor they should be able to tell you what it is all about and weather their is any truth to it at all.