Influence of COVID-19 on trust in routine immunization, health information sources and pandemic preparedness in 23 countries in 2023

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45 Percent of Surveyed American Adults Doubt Vaccine Safety - Infection Control Today

A recent online survey of more than 2,000 U.S. adults, conducted by The Harris Poll on behalf of the American Osteopathic Association, revealed that more than 2 in 5 American adults (45 percent) say something has caused them to doubt vaccine safety.

The spread of negative attitudes towards vaccines is a phenomenon deeply rooted in human psychology and amplified by social media, according to perinatal psychiatrist Rachel Shmuts, DO.

"From an evolutionary perspective, humans are primed to pay attention to threats or negative information," she says. "So it makes sense that people hold onto fears that vaccines are harmful, especially when they believe their children are in danger."

She believes it is possible that, since vaccines have been so effective in eradicating disease, people may have more fear of possible vaccine side effects than the actual diseases vaccines prevent.

"For some, it really might be that vaccines are viewed as the more salient threat," says Shmuts.

Although 55 percent of Americans don't doubt vaccine safety, 45 percent noted at least one source that caused doubts about the safety of vaccination. The top three doubt-causing sources were online articles (16 percent), past secrets/wrongdoing by the pharmaceutical industry (16 percent) and information from medical experts (12 percent).

The survey also asked Americans to choose a statement that best represented their feelings about vaccine safety and efficacy. While the vast majority (82 percent) chose in favor of vaccines, 8 percent selected responses expressing serious doubt. An additional 9 percent said they were unsure.

Physicians say those small margins can cause significant damage to public health if the doubts result in more unvaccinated people.

"Some diseases, like measles, require as much as 95 percent of the population to be vaccinated in order to achieve herd immunity," says osteopathic family physician Paul Ehrmann, DO. "Our practice considers itself a steward of public health, so we do not take new patients who refuse to vaccinate."

Ehrmann explains that herd immunity is essential to maintain, because some people cannot be vaccinated due to medical conditions including allergies, illness, or a weakened immune system. Keeping the rest of the population vaccinated protects those who are vulnerable.

"People know that a lot of practices won't accept patients who don't vaccinate, so when they find one that will, they spread the word to their community that it's a safe place. Whether intentional or not, those doctors are often seen as endorsing anti-vaxxer beliefs," Ehrmann said.

While social media has helped spread misinformation about vaccines, it has not been effective for countering those claims, even with scientific research, according to Shmuts.

She explains that confirmation bias--the tendency to trust new information that bolsters existing beliefs and discredit information that challenges those beliefs--makes it difficult to convince someone vaccines are safe, effective and necessary once they believe they are not.

"The number of people who believe vaccines are dangerous and refuse to get them is still relatively small. However, online support groups seem to solidify their beliefs, making them less susceptible to influence from their neighbors and real-world communities," says Shmuts.

Ehrmann agrees, adding that arguing or being judgmental with patients only pushes them further into communities that share their beliefs. Instead, he thinks policy changes are likely the most effective means to change behaviors, if not hearts and minds. His home state of Michigan discontinued public education for vaccines in the mid-2000s and allows for medical, religious and philosophical exemptions for vaccination, making the state accommodating to anti-vaxxers. As recent as 2015, Michigan ranked 44th in the country for the number of vaccinated children 19 months to 35 months. However, in 2017 the state, with other partners, launched a public information campaign that has significantly improved vaccination rates across demographics.

"Beliefs are hard to change especially when they're based in fear," says Ehrmann. "But, being responsible for our patients' health and the public's health, we can't afford to give in to those fears. We must insist on evidence-based medicine."

Source: American Osteopathic Association (AOA) 



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