i had this unprotected sex last oct 2008.. after a year.. i had an HIV test and its negative.. its 1year since the possible encounter.. how accurate is that?? i mean is it 100% sure that im really negative of HIV? cause this past few months.. im having flu again and again.. (i also think that the cause of my flu is that its cold here this time.. and because of the changing climates.. very cold at night... very hot in afternoon..) can someone enlightened me how accurate can HIV test be..