It's great you're getting the jab as getting vaccinated as early as possible means you’re less likely to catch flu this year and if you do, it’ll be milder and less likely to trigger an asthma attack.
Like all medicines and vaccinations, there are some potential side effects when you or your child have a flu vaccination. The good news is that side effects are usually mild and temporary - and not everyone will experience them. It takes between 10 and 14 days for your immune system to respond to the vaccine fully. There's a bit of information here: nhs.uk/conditions/vaccinati...
It will be interesting to hear how you get on JanJan. Being over 65 I have wondered about this new flu jab. My husband is signing up to have it done, but as I am allergic to eggs I don't usually have it done.
Unfortunately, it's still possible to get flu even with the jab because it only protects against 3 strains (there are at least 15). So it's entirely possible that your friend got one of the others, or the jab didn't have quite the desired effect (especially if you're over 65!). But i still think it's wise to have it, as the potential benefits far outweigh the risks.
Two Types of Flu Jab, I believe. A ‘2 strain’ Jab for over 65’s with no significant history of Respiratory Disease AND a ‘3 Strain’ Jab for thise of any age who qualify due to their Respiratory Illness History. Make sure you ask about this to ensure you get the right Jab for your circumstances.
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