Very sick; Extremely weak; Chills; This spontaneous case was reported by a consumer and describes the occurrence of ILLNESS (Very sick), ASTHENIA (Extremely weak) and CHILLS (Chills) in an 82-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 023M20A and 030L20A) for COVID-19 vaccination.     Concurrent medical conditions included Leukemia.   On 28-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 25-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 28-Feb-2021, the patient experienced ILLNESS (Very sick), ASTHENIA (Extremely weak) and CHILLS (Chills). At the time of the report, ILLNESS (Very sick), ASTHENIA (Extremely weak) and CHILLS (Chills) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 02-Apr-2021, Alanine aminotransferase normal (0-40): 28 (normal) 28 U/L -Normal. On 02-Apr-2021, Anion gap (5-15): 11 (normal) 11 mmol/L - Normal. On 02-Apr-2021, Anisocytosis: few (Inconclusive) Few. On 02-Apr-2021, Aspartate aminotransferase normal (0-45): 38 (normal) 38 U/L- Normal. On 02-Apr-2021, Blood albumin (3.5-5.0): 4.6 (normal) 4.6 g/dl - Normal. On 02-Apr-2021, Blood alkaline phosphatase (0-125): 151 (High) 131 U /L - High. On 02-Apr-2021, Blood bilirubin (0.0-1.3): 1.3 (normal) 1.3 mg/dl - normal.. On 02-Apr-2021, Blood calcium (8.4-10.5): 10.2 (normal) 10.2 - mg/dl - Normal. On 02-Apr-2021, Blood chloride (98-108): 103 (normal) 103 mmol/ L- Normal. On 02-Apr-2021, Blood creatinine (.5-1.2): 1.2 (normal) 1.2 mg/dl - normal. On 02-Apr-2021, Blood glucose (65-99): 107 (High) 107 mg/dl - high. On 02-Apr-2021, Blood potassium (3.5-5.0): 4.2 (normal) 4.2 mmol/L - normal. On 02-Apr-2021, Blood sodium (135-145): 141 (normal) 141 mmol/L - normal. On 02-Apr-2021, Blood urea increased (9-20): 18 (normal) 18 mg/dl - normal. On 02-Apr-2021, Carbon dioxide (23-32): 27 (normal) 27 mmol/L - normal. On 02-Apr-2021, Eosinophil count (.0-.3): 1.4 (High) high and 4 (High) 4 % - High. On 02-Apr-2021, Glomerular filtration rate: 58 (Inconclusive) 58 ml/min. On 02-Apr-2021, Haematocrit (41-52): 46.9 (normal) 46.9 % - Normal. On 02-Apr-2021, Haemoglobin (13.9-18): 14.6 (normal) 14.6 g/dl - normal. On 02-Apr-2021, Lymphocyte count: many (Inconclusive) Many, 24.49 (High) 24.49 %- high Lymphocytes skyrocket. and 70 (High) 70 % - High Lymphocytes sky rocket.. On 02-Apr-2021, Mean cell haemoglobin (27-33.3): 29 (normal) 29 pg/ml - Normal. On 02-Apr-2021, Mean cell haemoglobin concentration (31.8-37.1): 31.1 (Low) 31.1 - g/dl - low. On 02-Apr-2021, Mean cell volume (80-98): 93.1 (normal) Normal. On 02-Apr-2021, Mean platelet volume (7.4-10.5): 12.2 (High) High. On 02-Apr-2021, Monocyte count (.14-.76): 2.8 (High) High and 8 (High) 8% high. On 02-Apr-2021, Neutrophil count (1.8-7.8): 6.3 (normal) Normal, 6.3 (normal) Normal and 18 (Low) 18 % - Low. On 02-Apr-2021, Nucleated red cells (0-6): 0.0 (normal) Normal and 0.00 (normal) Normal. On 02-Apr-2021, Platelet count: decreased (Low) Decreased and 113 (Low) Low. On 02-Apr-2021, Platelet function test: few (Inconclusive) Few. On 02-Apr-2021, Poikilocytosis: few (Inconclusive) Few. On 02-Apr-2021, Polychromasia: few (Inconclusive) Few. On 02-Apr-2021, Protein total (6.0-8.2): 6.9 (normal) 6.9 g/dl- Normal. On 02-Apr-2021, Red blood cell count (4.44-6.1): 5.04 (normal) Normal. On 02-Apr-2021, Red blood cell morphology: reviewed (Inconclusive) Reviewed. On 02-Apr-2021, Red cell distribution width increased (39.0-52.2): 55.7 (High) 55.7fl - High and 16.5 (High) 16.6 % - high. On 02-Apr-2021, White blood cell count (4.6-10.8): 34.99 (High) High.         Action taken with mRNA-1273 in response to the event was not applicable.  No concomitant or treatment medications provided by reporter.  Patient's WBC and lymphocytes stabilized on Wednesday 05-May-2021. other sign/symptoms are still on going .