Guillain-Barre Syndrome, Facial Diplegia, and Pfizer COVID-19 Vaccine.

To the Editor:

We would like to share our thoughts on “Guillain-Barre Syndrome Presenting as Facial Diplegia after COVID-19 Vaccination: A Case Report” (1). Rossetti et al. stated that “It is critical for emergency physicians to be aware of the manifold presentations of GBS for early recognition . . . worldwide vaccination campaign in response to the COVID-19 pandemic” (1). Guillain-Barre syndrome (GBS) after vaccination is a possible adverse event after receiving the COVID-19 vaccine. It is necessary to exclude other possible causes by means of serologic examination for other infections. Indeed, another possible cause of the problem is hyperviscosity after vaccination. After COVID-19 vaccination, hyperviscosity can be induced and hyperviscosity is a possible cause of a temporary manifestation, such as GBS and diplegia (2, 3, 4).