General information, not an individual diagnosis. Ask a healthcare professional if you are unsure about your situation.
The cited flu vaccine leaflet asks patients to inform the doctor when a blood analysis is performed in the few days after vaccination. The useful action is to provide the vaccine’s exact name and injection date, rather than deciding for yourself what caused a result.
Its product information describes transient false positive results in certain ELISA tests for antibodies against HIV-1, hepatitis C and, particularly, HTLV-1. It suggests a nonspecific IgM response induced by vaccination as a possible explanation; this hypothesis is not a diagnosis of infection in an individual.
This observation concerns specific antibody-testing methods. It does not mean that every blood test, every test looking for a virus or every current ELISA test is distorted. The doctor and laboratory professional need to know which method was actually used.
For HIV, Assurance Maladie distinguishes initial screening from confirmation: a positive ELISA result leads to another test to confirm the diagnosis. Recent vaccination therefore never lets you decide that a reactive result is false or disregard the requested follow-up.
Ameli currently describes a fourth-generation test combining antibody detection with a viral antigen. The product information’s statement about certain antibody tests is not enough to conclude that this combined test is necessarily affected. Do not apply a general statement to your result without the laboratory’s advice.
If an examination is planned or you receive an unexpected result, tell the prescriber and laboratory about the vaccination and ask what verification is needed. These sources give no universal interval for postponing a test: do not independently delay screening or a prescribed analysis.
Sources
Your health review
Review your health
Mon bilan prévention is an appointment to discuss your habits and choose your health priorities. Review the four age groups and practical information.