I saw this book You Wouldn't Want to Live Without Vaccinations! by Anne Rooney. This is an educational (or propaganda) book made for schools in the UK.

I thought I'd take a look at their website and see what other books they have done. BAM - interesting symbol? They also have an strange comment here on their facebook page.

Of course they could be completely innocent, but given the symbols and info above I think they might be worth checking out.