How can we improve immunity against infections/diseases?

first of all keep a reasonable diet , take a mintenance dose of ester-c or echinacea. i take a maintenance does every year or so and i cant remermber when i had a flu last. eat lots of super foods i.e tomatoes, peppers, leafy veg. i like that stuff anyway.read up on anything you can to boost your health.remem,ber that antibiotics will weaken your immune system as will having any type of surgery so if an op is imminent boost yourself up before you go into hospital.avoid antibiotics at all costs , only if absolutely neccessary. also painkillers , theyre an unneccessary evil. if its muscle or joint pain try heat and massage. painkillers aere only masking the problem, not helping.

Make sure you eat vegetables and fruits = vitamins! That's a preventive!

Good eating (nature's foods) good exercise, lots of water, and juices! And good air. Sunshine is good too, even just looking at it. And not to always be in crowds, and wash the hands a lot, especially when in public.

Eat healthy, epecially green vegetables and lots of fruit. Take a multivitamin with zinc. Wash hands often. Try to stay away from others that are sick. If you are sick yourself stay home from work. If you work with someone who is sick, sanitize the phone after they use it. That may sound extreme but when I worked in an office we passed viruses back and forth alot.