shortness of breath/feeling shortness of breath; slurred speech; just an overall low quality of health when it comes to quality of health; felt like they had an exposure to Covid but the symptoms quickly disappeared but came back; immune system has been ruined; Impaired mental concentration and focus; has to go to bed early and still take periodic naps throughout the day; feverish symptoms; fatigue/chronic fatigue; swelling of the arm where they received the vaccine/ weeks after getting the vaccine their arm was still swollen; almost flu like symptoms; clamy kind of night sweats; hot and cold; bruise after getting the vaccine; This spontaneous case was reported by a patient and describes the occurrence of INFLUENZA LIKE ILLNESS (almost flu like symptoms), NIGHT SWEATS (clamy kind of night sweats), FEELING OF BODY TEMPERATURE CHANGE (hot and cold), DYSPNOEA (shortness of breath/feeling shortness of breath) and DYSARTHRIA (slurred speech) in a 31-year-old male patient who received mRNA-1273 (Spikevax) (batch no. 057A22A) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     Patient didn't had previous health conditions or known allergies.     On 14-Sep-2022, the patient received first dose of mRNA-1273 (Spikevax) (unknown route) 1 dosage form. On 14-Sep-2022, the patient experienced INFLUENZA LIKE ILLNESS (almost flu like symptoms), NIGHT SWEATS (clamy kind of night sweats), FEELING OF BODY TEMPERATURE CHANGE (hot and cold), PYREXIA (feverish symptoms), FATIGUE (fatigue/chronic fatigue) and VACCINATION SITE SWELLING (swelling of the arm where they received the vaccine/ weeks after getting the vaccine their arm was still swollen). In September 2022, the patient experienced CONTUSION (bruise after getting the vaccine). On an unknown date, the patient experienced DYSPNOEA (shortness of breath/feeling shortness of breath), DYSARTHRIA (slurred speech), IMPAIRED QUALITY OF LIFE (just an overall low quality of health when it comes to quality of health), EXPOSURE TO SARS-COV-2 (felt like they had an exposure to Covid but the symptoms quickly disappeared but came back), IMMUNE SYSTEM DISORDER (immune system has been ruined), DISTURBANCE IN ATTENTION (Impaired mental concentration and focus) and SOMNOLENCE (has to go to bed early and still take periodic naps throughout the day). At the time of the report, INFLUENZA LIKE ILLNESS (almost flu like symptoms), NIGHT SWEATS (clamy kind of night sweats), FEELING OF BODY TEMPERATURE CHANGE (hot and cold), DYSPNOEA (shortness of breath/feeling shortness of breath), DYSARTHRIA (slurred speech), IMPAIRED QUALITY OF LIFE (just an overall low quality of health when it comes to quality of health), EXPOSURE TO SARS-COV-2 (felt like they had an exposure to Covid but the symptoms quickly disappeared but came back), DISTURBANCE IN ATTENTION (Impaired mental concentration and focus), SOMNOLENCE (has to go to bed early and still take periodic naps throughout the day), PYREXIA (feverish symptoms), FATIGUE (fatigue/chronic fatigue) and VACCINATION SITE SWELLING (swelling of the arm where they received the vaccine/ weeks after getting the vaccine their arm was still swollen) had not resolved and CONTUSION (bruise after getting the vaccine) and IMMUNE SYSTEM DISORDER (immune system has been ruined) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, SARS-CoV-2 test: Negative.     The action taken with mRNA-1273 (Spikevax) (Unknown) was unknown.   For mRNA-1273 (Spikevax) (Unknown), the reporter did not provide any causality assessments.   Concomitant product information was not provided by the reporter.   Patient didn't receive any other vaccines in the 4 weeks prior to COVID-19 vaccine.  Patient was still experiencing similar symptoms of chronic fatigue syndrome.  Patient didn't took any medications for side effects and saw a gp but they did not provide them with any information.  While patient was speaking, they are feeling shortness of breath, chronic fatigue, mental concentration of focus and slurred speech and feels their immune system has been ruined on purpose. Patient thinks it may be anemia. Patient felt the same since getting the first dose of the vaccine.