Dr iam 29 y male in india I involve unprotected sex 3 times with my boy friend (I am homosexual man) my last exposure five months ago I tested for hiv 5times with one monthinterval all non -reactive but my vdrl test possitive I treated for syphilis by antibiotics doxyciclin bid in 14 days and ceftriaxon injection 3 days please tell me sir syphilis will increase window period of hiv test? Sorry for bad english