IMU-201

Last time the world faced a deadly pandemic was the H1N1 Spanish flu in 1918, which affected almost one-third of the world's population (500 million people). Since then, almost 100 years later, we are now facing another pandemic of the SARS-CoV2 virus (COVID-19), which is still endemic to this day. As the technology evolved during those 100 years, an effective vaccine for COVID-19 was produced within only a year, a huge feat. But, unfortunately, due to its fast development, another force would arise limiting the impact of the vaccine: vaccine hesitancy and anti-vaxxers, which John Hopkins and the World Health Organization call the biggest current threat to global health. From politics to social media, it is clear that there has been a rapid spread of misinformation, resulting in hesitancy, especially from sociopolitically motivated people popularly referred to as anti-vaxxers. However, a second group of vaccine-hesitant people have also emerged, who are uneducated and remain undecided about vaccination mostly due to safety concerns. They come under the massive influence of anti-vaxxers and anti-vaccine propaganda through social media and politicians, which often make bold claims and huge headlines. To combat vaccine hesitancy, it is crucial that we debunk these conspiracy theories and misinformation that so many believe in, with factual, data-based information. Actively spreading correct information about the vaccines, such as disclosing the rigorous developmental processes and validation of safety data by the Food and Drug Administration (FDA), assurance for the unlikeliness of getting a lethal side effect along with tremendous health benefits, will encourage people for safe vaccination against COVID-19 and other potential infectious diseases in the future. This article discusses the role of anti-vaxxers and vaccine-hesitant groups, electronic social media, and politics in vaccine hesitancy among people. It describes the strategies to combat the roadblocks in the vaccination programmes and health benefits, offered by recent advances in scientific and technological developments.

Despite Brazil's tradition of successful mass immunization programs, the country has been experiencing alarming declines in vaccination coverage, especially among children. That is aggravated by the growth of anti-vaccine movements and the spread of health misinformation in social media in the last decade, which have worsened during the COVID-19 outbreak. Several reports link populism and far-right politicians to anti-vaccination support worldwide, which was also the case in Brazil during president Jair Bolsonaro's administration. This project aimed to identify the circulating pro and anti-vaccine narratives in Portuguese on Twitter, during a crucial decision-making period regarding childhood vaccination in Brazil, from December 9, 2021, until February 9, 2022. From the over one million tweets and four million retweets collected, we identified two well-defined groups, one in favor and another against vaccination. Within the sample, we selected 1500 influencer tweets with the highest impact (>500 retweets) and conducted content analysis. Although the pro-vaccine influencers were more retweeted than anti-vaxxer ones, we observed that anti-vaccine movements were more succesful in framing discussions on Twitter. The subject of COVID-19 was the target of political polarization embedded in populist, anti-science and anti-traditional media discourses promoted by anti-vaxxers. As a counterpart, the pro-vaccine influencers reacted inarticulately, focusing on criticizing the anti-vaccination actors, attitudes, and policies instead of promoting vaccines. Based on reults, we claim that a well-coordinated network of health communicators from science centers and health institutions, in partnership with properly briefed social media influencers and fact-checking sources, would more efectively pre-tempt the public about vaccine misinformation.