Four cases of Bell's (facial) palsy occurred in subjects in the Pfizer vaccine clinical trial of its mRNA vaccine, none in placebo recipients. FDA's briefing documentmentioned 3 cases, but 4 were discussed at the VRBPAC advisory meeting on December 10. The briefing document claimed, "This observed frequency of reported Bell’s palsy is consistent with the expected background rate in the general population." (page 43)
Three cases of Bell's palsy occurred in subjects who received Moderna's mRNA vaccine, and one in a plecebo recipient.
One case of Transverse Myelitis occurred in a subject in the Astra-Zeneca Covid vaccine trial. This is a rare and usually devastating complication. According to the Mayo Clinic, transverse myelitis "can cause pain, muscle weakness, paralysis, sensory problems, or bladder and bowel dysfunction... Other conditions, such as a stroke of the spinal cord, are often confused with transverse myelitis."