When science speaks to the world: the global value of scientific communication

Science is not an isolated pursuit. It underpins human progress, generating knowledge, improving lives, and connecting communities across borders. Yet knowledge alone is not enough. For research to have a global impact, it must be understood and made accessible to the public. The recent study published in Proceedings of the National Academy of Sciences (PNAS) — “Tattoo ink induces inflammation in the draining lymph node and alters the immune response to vaccination”  DOI: 10.1073/pnas.2510392122 — by Prof. Santiago González, Director of the Laboratory Infection and Immunity at the Institute for research in Biomedicine (affiliated to Università della Svizzera italiana) exemplifies how rigorous scientific work can engage global audiences, stimulate awareness, and inspire informed discussion.

The study has achieved exceptional visibility, with hundreds of media outlets reporting on its findings and reaching an estimated 51 to 80 million people worldwide. In Switzerland, the study received particularly strong attention across linguistic regions, reflecting the country’s role as a bridge between scientific research and public discourse. Leading outlets in the Italian-speaking region—including Corriere del Ticino, Ticinonline, laRegione, and RSI Radiotelevisione Svizzera—ensured broad national visibility, reaching both general audiences and viewers interested in science and public health. Coverage also extended to the French-speaking cantons through RTS, Le Matin, 24 Heures, and Radio Lac, while German-speaking Switzerland was engaged via platforms such as Watson, 20 minuten, SWI, Docinside, and  Medinside.

This multilingual dissemination allowed the study to reach diverse segments of the Swiss population, reinforcing the idea that high-quality scientific research, when clearly communicated, and on topics close to the general public, can transcend regional and linguistic boundaries and become part of a shared national conversation.  The study received extensive global media coverage, reaching audiences across more than 300 outlets in over 25 countries and more than ten languages. In Italy, Corriere della Sera and La Repubblica reached approximately 1.5–2 million and 1.2–1.8 million readers, respectively, while in Brazil Folha de S.Paulo, O Globo, and UOL collectively engaged up to 10 million people. In the United States, major digital platforms including Bloomberg, MSN, and Yahoo News reached millions of readers, and in Japan The Japan Times brought the findings to an English-speaking audience of up to one million.

Coverage extended well beyond these major publications through numerous local and regional outlets, ensuring resonance across diverse languages, cultures, and continents. Media attention spanned leading international news agencies, national newspapers, broadcasters, global digital platforms, radio stations, and specialized medical and scientific media, including Agencia EFE, Der Spiegel, El Mundo, RTVE, Medscape, Sky Italia, and The Sun. In addition, the article was featured in prominent general-audience science magazines such as The Scientist, New Scientist, and Geo, further amplifying its global reach.

The scale of this coverage is particularly striking considering that most scientific research rarely achieves significant visibility in mainstream media. Studies on climate research, for instance, show that fewer than one out of ten scientific papers are reported in the news, and only a small fraction receives sustained attention. This highlights how exceptional the reach of this PNAS study truly is, and how impactful well-communicated science can be.

Scientific communication is more than a measure of visibility—it transforms research into a collective public asset. When scientific findings are shared effectively, they empower communities with critical knowledge, support data-driven decision-making, and help counter misinformation.

The influence of the study extends beyond traditional media. It has been discussed in podcasts and audio programs, entering broader cultural spaces where science is part of everyday conversation. These discussions indicate that the reach of scientific work is no longer confined to journals or newspapers—it moves into public debate, shaping perception, awareness, and engagement across multiple platforms.

The reach of this PNAS study reminds us that one of the values of science is achived when it connects with society. By communicating discoveries clearly, responsibly, and accessibly, researchers do more than inform—they empower, inspire, and unite communities worldwide. This study exemplifies the noble purpose of scientific work: knowledge shared widely becomes knowledge that transforms lives.

Since its publication in PNAS the “Tattoo study” has generated substantial and wide-ranging attention across digital and social media platforms, reaching both scientific and general audiences worldwide. Since its publication, one month ago, the article has been visualized more than 100.000 times on the website of PNAS. In addition, according to Altmetric data, the article achieved an Attention Score of 1240, placing it in the top 5% of all tracked research outputs and in the 99th percentile for publications of similar age and source. The study was covered by more than 100 news outlets and multiple blogs, and had a significant impact also in the social networks being shared by 374 X users (formerly Twitter), mentioned by 377 unique users on Bluesky. Geographic metadata from X highlights a broad international reach, including the United States (22%), Spain (6%), United Kingdom (3%), Canada (3%), Argentina (3%), Mexico (2%), Australia (2%), France (2%), India (1%), with the remainder distributed across other regions, underscoring multiregional engagement. Demographic analysis of X users indicates that discussion was driven predominantly by members of the public (~76%), alongside scientists (~16%), healthcare professionals (~7%), and science communicators (~2%). In addition to platforms formally tracked by Altmetric, the study received significant amplification on Instagram through GeoPop, one of the largest Italian science communication outlets, which featured the findings in a dedicated post reaching a broad lay audience and facilitating further resharing via stories and secondary accounts.

While Instagram metrics are not currently quantified within Altmetric, this coverage represents a major channel for public dissemination, complementing the study’s strong presence on established and emerging social networks.

Collectively, these indicators demonstrate a substantial global digital footprint and interdisciplinary resonance, extending beyond academic circles into mainstream public discourse.