I was cranky tonight after the evening news mentioned Jenny McCarthy’s crackpot “green the vaccines” rally in DC this weekend. She and Jim Carrey are scheduled to appear on Good Morning America tomorrow. Ugh.

Orac, thankfully, snapped me out of my funk, by posting an (albeit mild) counter-response: an open letter to Congress on immunization policy written by a slew of doctors and public health experts. The money quote (emphasis mine):

Well-designed scientific studies are the only valid method of demonstrating medical cause and effect. In contravention of this fundamental principle, beliefs not based on science have led increasing numbers of parents to choose not to immunize their children. The implications of this choice are profound.

For those who don’t know, McCarthy, whose son is autistic, is now the high-profile spokesperson of those who believe that vaccines are the cause of the rising prevalence of autism in the U.S. On March 9, she distributed a letter online urging parents of children with autism to call the White House and “demand” the resignation of CDC director Julie Gerberding, who has led the CDC, in McCarthy’s words, “during a time when the autism epidemic has only gotten worse.”

Though the idea of an autism “epidemic” originated several years ago, it’s received massive media attention in the last year thanks to celebrities like McCarthy and Don Imus and the 4,800 families who are suing the government in federal “Vaccine Court.”

It’s true that autism diagnoses across the world have skyrocketed in the past few decades. Before 1990, the reported autism prevalence in America was 4.7 out of every 10,000 children; it’s now 60 per 10,000. The anti-vaccination gang says this correlates exactly with the rise in the number of childhood vaccinations, which went from 10 in 1983 to 36 in 2007. But scientists say the rise in autism diagnoses is instead a result of a broadened definition and better awareness of autism spectrum disorders in the medical establishment.

Don’t let their cute children fool you: The Antivaccers are a scary bunch. If Jenny and Jim have their way, the anti-vaccination movement will bankrupt the Vaccine Compensation Fund, start suing the pharmaceutical companies who manufacture the vaccines, and cause a public health disaster. Here’s hoping for rain in D.C. this weekend.

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