As funny as this may seem when I bad vegetarian I didn’t get the flu once!
I used to get the flu every year so bad and had a horrible, horrible cough to the point where it was almost like whooping cough.
Then I went off meat and I seriously stopped getting the flu.

Take a supplement like olive leaf extract to boost your immunity.

Washing your hands! Eat a well balanced diet, I have the flu needle- given where I work this is a must in my eyes.

Always wash your hands and don’t touch your face, and keep away from public transport at peak hours.

Garlic & lemon are meant to be great for avoiding the flu.
Put garlic in your meals & add lemon to your fish & drinks.

I think some people are just generally arch more bugs it might have to do with the immune system being down so I suggest staying healthy active and fingers crossed

Eating healthy , most of the immune system is in your gut, and increase vitamin c

Hand washing, simple as it sounds can be a huge factor in avoiding colds and flu. Make sure the kids get into the habit of proper hand washing and drying. Avoiding crowded places is also a good idea in flu season but of course this is not always possible. Common sense goes a long way!!!

You should wash hands frequently and have a hand sanitiser in your car or bag, its so important!

If you do get the flu – do seek medical support as secondary conditions care flare up. A flu needs careful attention.

Boost your immune system..up your vitamin c, eat garlic or take tabs and take a good echinacea supplement. AND like others have suggested practice good hygiene.

Make sure that you practise a good standard of hygiene. A flu shot is also a good thing.
Remember that the flu shot will not help you avoid getting the coming cold.

wash hands frequently, avoid crowded areas, let sunlight in at home as it kills the virus, glen 20 everything, if possible make the person wear a face mask at home to prevent spread

Sometimes it can be difficult and depends on the level of exposure.