Investigation Underway into RSV Vaccines and Guillain-Barré Syndrome Link

Health officials are examining a small number of Guillain-Barré syndrome cases among older adults who received new RSV vaccines, though the benefits of vaccination are still considered to outweigh the risks.

• Health officials are investigating a potential link between new RSV vaccines and rare cases of Guillain-Barré syndrome in older U.S. adults.
• The inquiry is based on fewer than two dozen cases among over 9.5 million vaccine recipients, with a higher than expected number of cases.
• Most cases of Guillain-Barré syndrome were reported in recipients of the Pfizer vaccine, but cases were also reported in those who received the GSK vaccine.
• Despite the investigation, health officials emphasize that the benefits of vaccination against RSV outweigh the potential risks.
• The CDC is conducting a more in-depth analysis to better determine the risk and magnitude of Guillain-Barré syndrome following RSV vaccination.

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