Typhoid occur every year

Why typhoid occur every year last year vaccination was also given.. from last 4 years my brother was suffering from typhoid after same interval of time last time he has given vaccination too then to this year he is again suffering from typhoid.
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Dr. Chethan R S
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Hi.... Neither vaccine is 100 percent effective, and require repeat immunizations, as vaccine effectiveness diminishes over time.... Wash your hands. Frequent hand-washing in hot, soapy water is the best way to control infection. Wash before eating or preparing food and after using the toilet. .... Avoid food that's stored or served at room temperature. Steaming hot foods are best. ..
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