As long as there have been vaccinations, there has been an antivaccine movement, and as long as there has been an antivaccine movement, there have been parents who refuse to vaccinate. In a past that encompasses the childhood of my parents, polio was paralyzing and killing children in large numbers in yearly epidemics, the fear of which led to the closure of public pools every summer. In such an environment, the new polio vaccine introduced by Jonas Salk in the mid-1950s wasn’t a hard sell. In fact, satisfying the initial demand for it was the problem, not parents refusing to vaccinate their children. Since then, more and more vaccines have been developed to protect more and more children from more and more diseases, to the point where the incidences of most vaccine-preventable diseases is so low that, unlike 60 years ago, most parents today have never seen a case or even known other parents whose child suffered from a case. Even as recently as the 1980s, Haemophilus influenza type B was a dread disease that could cause meningitis, pneumonia, sepsis, and death. Since the introduction of the the Hib vaccine a mere quarter century ago, Hib has been virtually eliminated. Most pediatricians in residency now have never seen a case.
As much of a cliché as it is to say so, unfortunately vaccination has been a victim of its own success, at least in developed countries. Parents no longer fear the diseases childhood vaccines protect against, which makes it easy for antivaccine activists to provide what I like to call “misinformed consent,” by spreading misinformation that vastly exaggerates the risk of vaccines compared to the benefit of vaccinating. Parents who believe the misinformation conclude, based on a warped view of the risk-benefit ratio of vaccines, that not vaccinating is safer. Add to the mix fear mongering against the MMR based on Andrew Wakefield and his dubious 1998 case series that popularized the then-recent idea that vaccines cause autism, and it’s no wonder that parents decide that not vaccinating is safer than vaccinating. If you believe the misinformation, it’s not an entirely unreasonable conclusion. Then add to that the easy availability of “personal belief exemptions” to school vaccine mandates in many states, which include anything from religious exemptions to parents just signing a form that says they are “personally opposed” to vaccination, and it isn’t a huge surprise that vaccine uptake has fallen in some areas to the point where outbreaks can occur. It was happening in California and my own state of Michigan. (more…)