Received Feb 25, 2026
| Type | Name | Manufacturer | Dose | Lot | Route / Site |
|---|---|---|---|---|---|
| FLUX | INFLUENZA (SEASONAL) (NO BRAND NAME) | UNKNOWN MANUFACTURER | UNK | No batch number | SYR |
Tachycardia at 156 bpm; Severe headache; Fever; Emesis; Inadvertently administered an IV dose of the seasonal influenza vaccination; This literature report (initial receipt: 10-Feb-2026), concerns a child patient of unknown gender who received routine influenza vaccination. The patient with a past medical history of IgA deficiency, was inadvertently administered an otherwise routine polyvalent influenza vaccine intravenously [influenza vaccine: trade name, manufacturer and lot number not reported - to be requested upon follow up]. The patient did not have a history of egg allergy. Nine hours later, the patient presented to the local emergency department crying with a severe headache and reported fever with a single episode of emesis at home. Vitals were reported as tachycardia at 156 beats per minute (bpm), afebrile, and normotensive. Physical exam did not reveal any respiratory difficulty or rash. The centre recommended symptomatic care. The patient was treated with 15 mg/kg of acetaminophen and 0.5 mg of ondansetron, discharged five hours later with improvement. Author's comment: To our knowledge, this appears to be the first documented incidence of unintentional IV administration of a seasonal influenza vaccine in a pediatric patient.; Reporter's Comments: Due to the spontaneous nature of the case, all events are considered related for the reporting purposes. There is close temporal relationship between the reported events (headache, tachycardia, vomiting, pyrexia) and the suspect vaccine administration (nine hours after vaccine administration). of note, incorrect route of vaccine administration acts as an confounder. Furthermore, subject was treated symptomatically and discharged home five hours later with improvement.
IgA deficiency