anyone suffered severe health issues?

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i know that its odd to tell but i myself has fallen sick maany a times and it just happens to me even if i have every precaution to avoid it. i have had suffered from typhoid 10-15 times for the past three years mainly in winters. and i m wondering that still no immnity is inside me to protect me from that repeated disease its odd but its true. i m fed up of this. has any one suffered a disease repeatedly other than cold n cough plzzzzz tell for my satisfaction that i m not unique. plzzz ddiscuss