Disease outbreaks are increasing; a Drexel study shows that legislators are taking action

November 18, 2019

PHILADELPHIA -- Vaccine-preventable disease (VPD) outbreaks are increasing in frequency in the United States, but this trend is also met with an uptick in legislation aimed at increasing childhood vaccination in places where those epidemics occurred, according to findings published today in JAMA Pediatrics from researchers at the Dornsife School of Public Health at Drexel University.

The Drexel team found that as VPD outbreaks increased, so did introduction of state legislation intended to restrict laws that allow for skipping childhood vaccinations. The team looked at 2010-2016 state-level data on 12 different childhood VPDs reported to health departments, including Hepatitis A and B, flu, measles, whooping cough and others. They then probed state legislature data for bills introduced the year following the start of an outbreak, between 2011-2017, that would expand or reduce the criteria required to be vaccinated for these diseases.

The study found that each state reported an average of 25 VPDs per 100,000 people per year, with substantial variability year to year. Of the 175 related bills proposed during 2011-2017, 53 percent made it easier to exempt oneself from vaccine requirements while 47 percent made it more difficult to be skip vaccination.

Although there were more anti-vaccine bills than pro-vaccine bills introduced overall during this seven-year period, grouping the bills into these two categories paints a more public health-centered picture. Researchers found that increases in VPDs were actually positively associated with increases in the number of proposed pro-vaccine bills that restrict exemptions. They did not observe any statistical association between decreases in VPDs and proposed bills that would make it easier to bypass vaccination.

Legislation to increase vaccination is particularly needed in the United States. In 2000, the Centers for Disease Control and Prevention declared measles eliminated in the United States, but announced 695 measles cases in 22 states in April 2019. Two recent outbreaks in California (2015) and New York (2019), led state legislatures to remove all nonmedical exemptions.

"Vaccines are our best public health tool for controlling many childhood diseases," said lead author Neal D. Goldstein, PhD, an assistant research professor of epidemiology and biostatistics at Drexel's Dornsife School of Public Health. "Seeing an uptick in legislation aimed at cutting vaccine exemptions following disease outbreaks suggests that media coverage may raise public awareness and advocacy and response from legislators. While it is unfortunate it took outbreaks of preventable disease to spawn legislative action, it further affirms the widespread support of this life-saving intervention."

According to the Wellcome Global Monitor 2018 report, support for vaccination varies substantially between countries, with lower income regions reporting greater confidence than higher income regions do in vaccines. This distrust of vaccines in some wealthier countries makes "herd immunity" - vaccination of the vast majority of a population to prevent individuals from contracting a disease and spreading it to others - much more difficult to achieve, particularly in small, but vocal communities who are hesitant to vaccinate.

The latest report on the consensus among the scientific community in support of vaccines is summed up in The Salzburg Statement on Vaccination Acceptance, published by some public health experts in July 2019 in the Journal of Health Communication. In the text, the authors share their "unwavering commitment to universal childhood vaccination."

In November 2018, Goldstein and colleagues published a study in the American Journal of Public Health showing that, despite increasing numbers of anti-vaccine bills being introduced in state legislatures from 2011 to 2017, pro-vaccine legislation was more likely to become law.

After countless studies on how laws affect health, the Drexel team flips that model on its head to report data about how health affects laws.

"We believe this paradigm can be applied to many other public health areas, not just vaccination," said Goldstein, who also consults for Merck Sharp & Dohme Co., but noted that the company had no role in the study or its outcome.
The Drexel study follows a 2018 study in the Journal of Health Economics linking a whooping cough outbreak to an increase in vaccination among kindergarteners.

In addition to Goldstein, additional authors include Jonathan Purtle, DrPH, from Drexel and Joanna S. Suder from the Delaware Department of Justice.

Drexel University

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