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Immunity is the mainstay. Take foods to enhance immunity.

High protein diet,  plenty of fluids  , take all fruit n vegetables.  Exercise is important.  Consult

Hello. Second time infections are generally observed to be mild and at most times asymptomatic. You need to follow general measures of healthy well being. Eat healthy, maintain social distancing, get your scheduled dose of vaccination and exercise regularly. These measures should be enough to keep your immunity upto the mark. If you still are having recurrent viral and bacterial infections you might want to consult an internal medicine specialist to screen you for immunodeficiency disorders.

You need to take high protein healthy diet and do regular exercises to boost your immunity. You should take regular vitamin and mineral supplements also for that you can consult a doctor.