Flu shot after having flu: what to know

Influenza is a group of changing viruses rather than one single virus. Your recent illness may have involved only one strain, while the seasonal vaccine is intended to prepare the immune system for strains selected for the current season. A past infection can therefore be useful information for a clinician, but it does not answer every vaccination question by itself.

The vaccine is not a medicine for lingering flu. Cough, tiredness, and reduced appetite may continue during recovery. Vaccination also does not work immediately, so protection develops after the immune system responds.

Tell the vaccination provider that you have recently had flu, when you began to recover, and whether you still have a fever. If you are recovering from a significant illness or have a long-term condition, ask about the most suitable timing. Keep a record of any vaccine reaction and bring details of serious past reactions.

Until you feel better, prioritise rest and fluids and limit close contact when you are unwell. Information about an [Inactivated Vaccine](/materials/inactivated-vaccine/) can help you discuss the vaccine type with your clinician.

Get urgent help for severe breathing difficulty, blue or grey lips, chest pain, collapse, marked confusion, or inability to wake normally. Arrange medical review if you improve and then become noticeably worse, develop a returning fever, or cannot drink enough to stay hydrated. Do not wait for a vaccination appointment when these symptoms are present.

Ask whether your illness could have been influenza, whether vaccination is still appropriate this season, when you should attend, and which symptoms would mean your recovery needs review.