Guillain-Barré Syndrome Following the Administration of Adenovirus Vector-Based COVID-19 Vaccine.

As countries worldwide deployed their respective coronavirus disease 2019 (COVID-19) vaccination programs to mitigate the risk of COVID-19 to their citizens, several side effects and complications from the use of the various types of COVID-19 vaccines were documented and are continued to be monitored to further study the safety and efficacy of these vaccines. One such complication, the Guillain-Barré syndrome (GBS), was reported in some individuals who received a COVID-19 adenovirus vector-based vaccine. In this particular report, we describe one such case. The patient had diarrhea and fever one day after vaccination, which was a triggering event. Seven days post vaccination, the patient had bilateral symmetrical weakness with absent deep tendon reflexes. However, causality between the vaccine administered and the suspected adverse reaction cannot be readily assumed. The benefits and risk profiles of each available vaccine should be assessed continuously for it to be improved and truly useful in this pandemic. Thorough post-vaccination surveillance, along with national reporting mechanisms are needed to help establish and confirm possible links between GBS and adenovirus vector-based COVID-19 vaccines. This link needs to be probed further in prospective studies and clinical trials.