As an unapologetic man of science, I am (of course), an enthusiast of immunisation. Whatever the standpoint that I try to attack it from – historian, scientist, logician, economist, philosopher, parent or just plain old gambler working the odds off the pure metrics that we have – I can come to no other conclusion that immunisation has been a boon to human society. As it is my blog, I can assert this with total and utter unyielding authority. In this manner then, I always find that the best World Health Organisation campaigns are those that are blunt and to the point. Thus, I really, really like this immunisation campaign poster from 1975. I apologise for the poor quality of the image, but the pictures should be clear. Here we see two new mothers, one trusts the health worker and chooses to immunise her child. The second is not so sure and chooses to not do so. Of course, baby number one now has a glowing protective halo, and baby number two does not. When disease strikes (as it inevit...