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Recurrent infection is due to state of immunosuppression which can be of number of reasons like
1 ) inadequate and improper diet
2) long term oral steroids or other immunosuppressive drugs
3) Repeated exposure to an infectious agent
4) Allergic diseases like asthma, sinusitis
I will advise you to visit your doctor so that he can examine you properly and order you relevant investigations.
Have a good diet including green leafy vegetables and fruits.
I hope it helps.
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