I seem to remember, that the worst injection I received was for Yellow Fever, on being posted to the Sudan. --- It was of the consistency of Treacle, and was, therefore, administered with a "Short Sword " !!
In Egypt, if anyone fell into, or near, the Sweetwater Canal (The best mis-nomer ever !) there was a "Canal Tray" for the Medics containg about 10 preparations against ANYTHING !
Nowadays, The Blessed Anne, and I,each have 4 injections a day self- administered and glad of it !
after 53 and 30 years ,respectively, --- you get to know where the anaesthetoc spots are !
I can't remember whether we had any at CH --Anti Smallpox was pretty universal, and of course it was all pre-NHS ! (Ah! the happy times, down the CH Mine !)