A multinational study analyzing data from over 230 million people has revealed that SARS-CoV-2 infection and certain adenoviral COVID-19 vaccines are associated with an increased risk of Guillain-Barré syndrome (GBS), a rare neurological disorder. The research, published in Vaccine, conducted across 20 global sites, found no such link with mRNA or inactivated vaccines, reinforcing the importance of vaccine safety monitoring and the higher risks posed by COVID-19 infection itself.
The study, led by the Global Vaccine Data Network (GVDN), examined healthcare data from diverse regions, including Africa, North America, Europe, and Asia. Results showed that individuals infected with SARS-CoV-2 were three times more likely to develop GBS within six weeks of infection compared to uninfected periods. Similarly, adenoviral vector vaccines (AstraZeneca and Janssen/Johnson & Johnson) were linked to a higher GBS risk, while mRNA vaccines (Pfizer-BioNTech, Moderna) and inactivated vaccines (Coronavac/Sinovac) showed no increased risk.
GBS, which causes progressive muscle weakness and paralysis, affects 1 to 4 people per 100,000 annually and has been associated with infections like Zika and influenza. The study’s findings underscore the critical role of vaccination in mitigating severe health risks, as COVID-19 infection poses a greater threat than vaccination.
Dr. Jeff Kwong, a senior author of the study, emphasized, “Receiving an mRNA COVID-19 vaccine does not appear to increase your risk of GBS, but infection with the virus does. This highlights the importance of vaccination in protecting against serious complications.”
Dr. Sharifa Nasreen added, “While certain vaccines may carry small risks, SARS-CoV-2 infection presents a much greater threat to neurological health.”
The study underscores the value of global collaboration in vaccine safety research and the need for continuous monitoring. It also reaffirms that vaccination remains a vital tool in reducing rare complications like GBS, alongside preventing severe COVID-19 outcomes. Future research will further explore these associations to guide public health strategies.
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