http://www.healthline.com/health-news/children-anti-vaccination-movement-leads-to-disease-outbreaks-120312 [quote]Even in 2013, the anti-vaccination movement continues to leave the door open to outbreaks of diseases that have been all but eradicated by modern medicine. These diseases include measles, polio, whooping cough, and more.[/quote] There's a ton of [i]deadly[/i] diseases. A case of hay fever isn't deadly or [b]contageous[/b].