My Dad just had a pertussis booster today at the Dr's. So it does exist in single doses. Maybe research it yourself and then head to a new Drs and ask..... ETA- actually i am not 100
% they didn;t give him a combined shot.... will find out.

We selectively immunise. I read a great book called 'the vaccine book' by Dr Bob Sears. It provides good information about the diseases, their actual risks as well as the immunisations and their risks.

I will be getting pertussis immunisation done for this next one.