PF4 and Bell's palsy: Based on reviews of other autoimmune phenomena such as platelet factor 4 (PF4) antibody-mediated thrombotic thrombocytopenia (VITT) [14, 15], Guillain–Barre’ syndrome [8, 16], and Bell’s palsy [17, 18] associated with COVID-19 vaccines, the great majority of the cases were documented within 30 days post vaccination coinciding with the maximal host response.