Answer
A minor illness is not necessarily a barrier, but vaccination should be postponed during a high temperature or febrile illness until the fever resolves.
Sources for this answer
- Cell-based Trivalent Influenza Vaccine Seqirus — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.