Guillain-Barré syndrome in an era of global infections and 21st century vaccination.

Purpose of Review: Guillain-Barre syndrome is sometimes a severe and disabling postinfectious neuromuscular paralysis that is causally associated with a number of well defined infections, and occasionally with immunization. The severe acute respiratory syndrome coronavirus 2 (Sars-CoV-2) pandemic and the worldwide immunization programme provoked fears of an epidemic of coronavirus disease 2019 (COVID-19) related disease. As we emerge from the pandemic this review summarises some of the huge volume of publications about Guillain-Barre syndrome (GBS), COVID-19 and immunisation against it.
Recent Findings: In the early months of COVID-19, there were concerns of significant numbers of cases of GBS resulting from SARS-CoV-2 infection. Large epidemiological studies have provided reassurance that the association of GBS with COVID-19 is small or absent. Despite considerable efforts, plausible pathogenic mechanisms aligned with our understanding of GBS causation have not been identified. Reliable data from national surveillance of COVID-19 vaccinations have shown GBS to occur at about 5.8 cases per million first doses of adenovirus vectored COVID-19 vaccines, otherwise not distinguishable from incident naturally occurring cases. However, this risk is far outweighed by the protective benefits of vaccination in the at-risk older deciles of age.
Summary: With no obvious link of GBS to COVID-19 epitopes, in particular the spike (S-)protein, but a clearly demonstrable causation in some susceptible individuals from the global rollout of novel adenovirus vectored vaccine technologies, adenoviruses are of significant interest in the pathogenesis of GBS as well as vectors in their many expanding pharmaceutical applications.
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