There are contagious diseases in this world; everyone knows this.
Some of these disease can kill or permanently incapacitate; everyone knows this too, although not all realise these include so-called ‘childhood illnesses’.
The cumulative effect of thousands, even millions, of people forced to take time off work because of illness during an epidemic costs the economy billions of (insert national currency here) every year. Not everyone realises this.
For many of these diseases, there exists a vaccine. Most people admit this, but a very vocal and evidence-resistant minority deny it. Or, worse, claim that the vaccine is more dangerous than the disease it can prevent, or at least attenuate.
No, seriously.
