In a recent post I shared a bit of my personal, near-death experience with measles during the US epidemic of 1989-1991. As I describe in that post, I contracted a very serious measles infection at the end of medical school, and was highly infectious when I interviewed for a residency position at Seattle Children’s Hospital. Like others my age who received an ineffective, killed measles vaccine between 1963 and 1967, I had not been adequately protected. The MMR vaccine was not yet available, and no boosters were recommended at the time. Unfortunately, though my measles titers (a test of immunity to measles) were checked when I entered medical school, the school’s student health department failed to notice or respond to the results – I was not immune and did not receive a booster dose at that time, as I should have. That mistake was huge, and could have cost me my life. It also caused me to potentially sicken many vulnerable children during my tour of the hospital, as well as others I may have inadvertently exposed during the window of communicability as I walked the streets of Seattle. The Department of Health had to be called to trace all of my steps and attempt to track down and protect any potential contacts.
Of all the preventative treatments ever developed through science- and evidence-based medicine, vaccines have arguably saved more lives, prevented more illness and disability, and in general alleviated more suffering than any single class of treatments or preventative measures throughout history. Given the obvious and incredible success of vaccines at decreasing the incidence of infectious diseases that used to ravage populations, it seems incredible that there would be such a thing as an antivaccine movement, but there is. Indeed, when I first encountered antivaccine zealots on the Usenet newsgroup misc.health.alternative about ten or twelve years ago, as a physician I really had a hard time wrapping my head around the fact that such people existed. No doubt the same is true of many physicians, who take the scientific evidence for the safety and efficacy for vaccines for granted. However, I am a cancer surgeon, and I do not treat children; so until I discovered antivaccine rhetoric on the Internet I was blissfully ignorant that such views even existed. Other health care professionals knew better. Pediatricians, nurses, and any health care professionals who deal with children and the issue of vaccinations know better, because they face antivaccine views on a daily basis. It is because of the incredible importance of vaccination and the danger to public health the antivaccine movement represents that we at Science-Based Medicine write so frequently about vaccines and the antiscientific, pseudoscientific, and misinformation-packed fear mongering about vaccines that is so prevalent today.
The success of vaccination campaigns has recently been endangered by a number of factors, in particular the antivaccine movement. Because of various groups opposed to vaccination, either for philosophical reasons or because they incorrectly believe that vaccines cause autism, neurodevelopmental disorders, sudden infant death syndrome, and autoimmune diseases, among others, one of the most potent tools for encouraging high rates of vaccine uptake, school vaccine mandates, have come under attack. Alternatively, increasing numbers of parents have taken advantage of religious or philosophical exemptions in order to avoid the requirement to have their children vaccinated prior to entry to school. As a result, of late some states with lax vaccination requirements have begun to try to tighten up requirement for non-medical vaccine exemptions. The arguments used by the antivaccine movement against such legislation are highly revealing about their mindset, in particular their attitude towards issues of informed consent, which I will discuss a bit. But first, here’s a little background.