Received Oct 28, 2025
| Type | Name | Manufacturer | Dose | Lot | Route / Site |
|---|---|---|---|---|---|
| COVID19 | COVID19 (COVID19 (MODERNA MNEXSPIKE)) | MODERNA | UNK | — | IM |
white blood cell count had decreased; This spontaneous case was reported by a consumer and describes the occurrence of WHITE BLOOD CELL COUNT DECREASED (white blood cell count had decreased) in a female patient of an unknown age who received mRNA-1273.251 (Spikevax LP.8.1 PFS) for COVID-19 prophylaxis. Co-suspect product included Pre-filled Syringe injection for COVID-19 prophylaxis. On 20-Oct-2025, the patient received dose of mRNA-1273.251 (Spikevax LP.8.1 PFS) (Intramuscular use) 1 dosage form. On an unknown date, the patient started Pre-filled Syringe (unknown route) at an unspecified dose. On 22-Oct-2025, after starting mRNA-1273.251 (Spikevax LP.8.1 PFS), the patient experienced WHITE BLOOD CELL COUNT DECREASED (white blood cell count had decreased). At the time of the report, WHITE BLOOD CELL COUNT DECREASED (white blood cell count had decreased) outcome was unknown. DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 22-Oct-2025, White blood cell count: decreased. Relevant Medical History (vaccines within the past 4 weeks, medical conditions) was reported as unknown. No concomitant medication was reported. Patient had received a Moderna COVID-19 vaccination on a Monday. Following this, she underwent routine bloodwork on Wednesday. Coincidentally, her doctor informed her that her white blood cell count had decreased. As a precaution, her doctor had requested another round of bloodwork to be conducted in one month. It was unknown if the patient experienced any additional symptoms/events. No treatment medication was reported. Reporter causality was not provided.
Test Date: 20251022; Test Name: white blood cell count; Result Unstructured Data: decreased