Summary: Study reports past problems with vaccine research can cause hysteresis, or a negative history that stiffens the resolve of some against vaccinations. The findings shed light on why it is hard to improve vaccine uptake, even when there is overwhelming evidence of the safety and benefits of vaccinations.
Source: Dartmouth College.
Why is it so challenging to increase the number of people who get vaccinated? How does popular resistance to vaccination remain strong even as preventable diseases make a comeback?
A new study from Dartmouth College shows that past problems with vaccines can cause a phenomenon known as hysteresis, creating a negative history that stiffens public resolve against vaccination. The finding explains why it is so hard to increase uptake even when overwhelming evidence indicates that vaccines are safe and beneficial.
A hysteresis loop causes the impact of a force to be observed even after the force itself has been eliminated. It’s why unemployment rates can sometimes remain high in a recovering economy. It’s why physical objects resist returning to their original state after being acted on by an outside force. And, according to the Dartmouth research, it’s why the public resists vaccination campaigns for ailments like the common flu.
“Given all the benefits of vaccination, it’s been a struggle to understand why vaccination rates can remain stubbornly low,” said Feng Fu, an assistant professor of mathematics at Dartmouth College. “History matters, and we now know that hysteresis is part of the answer.”
The research, published in the journal Proceedings of the Royal Society B, is the first study to demonstrate that hysteresis can impact public health.
“Once people question the safety or effectiveness of a vaccine, it can be very difficult to get them to move beyond those negative associations. Hysteresis is a powerful force that is difficult to break at a societal level,” said Fu, who led the research team.
Low vaccine compliance is a public health issue that can cause the loss of “herd immunity” and lead to the spread of infectious diseases. In parts of Europe and North America, childhood diseases like measles, mumps and pertussis have returned as a result of insufficient vaccination coverage.
Previous studies have combined behavior models with epidemiology to understand the challenge of voluntary vaccination, but have been unable to completely explain the persistence of low vaccine compliance. The Dartmouth research specifically studies how past problems associated with vaccinations can impact present and future vaccination decisions.
“This study shows why it is so hard to reverse low or declining vaccine levels,” said Xingru Chen, a graduate student at Dartmouth and the first author of the research paper. “The sheer force of factual, logical arguments around public health issues is just not enough to overcome hysteresis and human behavior.”
According to the research, the hysteresis loop can be caused by questions related to the risk and effectiveness of vaccines. Negative experiences or perceptions related to vaccination impact the trend of uptake over time – known to the researchers as a “vaccination trajectory” that gets stuck in the hysteresis loop.
Hysteresis prevents an increase in vaccination levels even after the negative objections have been cleared, making society increasingly vulnerable to disease outbreaks.
“When it comes to vaccination levels, the past predicts the future. Unfortunately, this means that a lot of people are going to needlessly suffer unless we find a way to break the negative impact of the hysteresis loop,” said Fu.
The study refers to the example of whole-cell pertussis vaccine in England and Wales in the period from 1978 through 1992. It took that 15-year span for uptake of the “whooping cough” vaccine to recover from 30 percent to 91 percent. According to the research team, such a recovery should only take about a year under ideal circumstances.
The research also notes the slow increase in measles vaccination in the face of resurgent outbreaks. In some countries, like France, measles has become an endemic disease despite the availability of an effective vaccine.
According to the study: “The coverage of measles vaccination has only gradually climbed up, but still remains insufficient, for more than a decade following the infamous MMR vaccination and autism controversy.”
“Vaccination levels in a population can drop quickly, but, because of hysteresis, the recovery in that same population can take many years,” said Chen.
For the common flu, the study suggests that a vaccine would have to have an effectiveness of above 50 percent in order to achieve high levels of vaccination, a difficult level to reach because of the speed with which the illness mutates.
By identifying the hysteresis effect in vaccination, the research team hopes that public health officials can design campaigns that increase voluntary vaccination rates, particularly by promoting vaccination as an altruistic behavior that is desired by moral and social norms.
Source: David Hirsch – Dartmouth College
Publisher: Organized by NeuroscienceNews.com.
Image Source: NeuroscienceNews.com image is credited to Feng Fu and Xingru Chen.
Original Research: Open access research for “SImperfect vaccine and hysteresis” by Xingru Chen and Feng Fu in Proceedings of the Royal Society B. Published January 9 2019.
Imperfect vaccine and hysteresis
Addressing vaccine compliance problems is of particular relevance and significance to public health. Despite resurgence of vaccine-preventable diseases and public awareness of vaccine importance, why is it so challenging to boost population vaccination coverage to desired levels especially in the wake of declining vaccine uptake? To understand this puzzling phenomenon, here we study how social imitation dynamics of vaccination can be impacted by the presence of imperfect vaccine, which only confers partial protection against the disease. Besides weighing the perceived cost of vaccination with the risk of infection, the effectiveness of vaccination is also an important factor driving vaccination decisions. We discover that there can exist multiple stable vaccination equilibria if vaccine efficacy is below a certain threshold. Furthermore, our bifurcation analysis reveals the occurrence of hysteresis loops of vaccination rate with respect to changes in the perceived vaccination cost as well as in the vaccination effectiveness. Moreover, we find that hysteresis is more likely to arise in spatial populations than in well-mixed populations, even for parameter choices that do not allow for bifurcation in the latter. Our work shows that hysteresis can appear as an unprecedented roadblock for the recovery of vaccination uptake, thereby helping explain the persistence of vaccine compliance problem.