about and chances

i  know that sometimes it takes years before an HIV+ person can show symptoms. And that it is possible to get a false negative test early after having contracted HIV. My questions is if somebody is showing symptoms early after possibly contracting HIV (within 3 months) and they test are negative even after 5 months , what are the chances that they are actually positive? or will be positive in later?? Is it possible to get a false negative while showing symptoms even uptill 6 months? Or if somebody is positive, and showing symptoms will they test positive or negative?? and what is the deffrent between *elisa*, *axcym*, *hiv duo*, *axsym*, and elecsys-ecl?? which of this test is realiable please??

[LIZZIE LOU]

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