Hi all, my DS who is 4 and has ASD is due his DPT booster and I am worrying about the link to Thermisol (sp?) in this and if it could make him regress? I have read somehwere to make sure it is the DPaT which is something about it not being a "live" vaccine. Can anyone give me any info to stop me thinking about this and just getting it done!! Many thanks, Nikki.