简介：HIVisablood-bomevirustransmittedviasexualintercourseorpercutaneousexposuretoinfectedblood,orfromaninfectedmothertoherchildduringthebirthprocess.Followinginfection,thetimebeforeonsetofclinicaldiseasevariesfrommonthstoyears;thedurationisinfluencedbyage(therateofprogressionincreaseswithage)andHLAtype(A1,B8,DR3areassociatedwithrapidprogressionandB27withslowprogression),butnotbygenderorriskactivity.Althoughmostpatientsinitiallyhavenocharacteristicsymptoms,thereisusually(90%)agradualdeclineinimmunefunction.
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