Inclusion Criteria:  Case: Any patient who received COVID-19 vaccines and developed GBS, VITT/TTS, or myocarditis/pericarditis after vaccination Control: Any participant who received COVID-19 vaccines and does not experience GBS, VITT/TTS, or myocarditis/pericarditis.  Exclusion Criteria:  Individuals who have not received a COVID-19 vaccine Individuals who are unable to provide informed consent