SinceFin dal 1982,manysono differentstate definitionsconiate havevarie beendefinizioni developedper foril epidemiologicalmonitoraggio surveillanceepidemiologico suchdell'infezione: astra thequeste la [[Banguidefinizione definitionBangui]] ande thequella dell'[[1994Organizzazione expandedMondiale Worlddella HealthSanità]] Organizationdatata AIDS case definition]]1994. HoweverTuttavia, thesenon weresono neverda intendedintendersi tocome beutili usedper forla clinicalclassificazione stagingclinica ofdei patientspazienti, forin whichquanto theynon aresono neitherappropriate sensitivee nor specificspecifiche. TheIl [[Worldsistema Healthdi Organization]]sclassificazione (WHO)usato stagingdall'Organizzazione systemMondiale fordella HIVSanità infectione andquello disease,del using clinical and laboratory data, can be used in developing countries and theCDC [[Centers for Disease Control and Prevention|Centers for Disease Control]] (CDC)può Classificationessere Systemutilizzato cansolo be used innei developedpaesi nationssviluppati.
====WHO Disease Staging System for HIV Infection and Disease====
Riga 110:
====CDC Classification System for HIV Infection====
In the [[USA]], the definition of AIDS is goverened by the [[Centers for Disease Control and Prevention]] (CDC). In 1993, the CDC expanded their definition of AIDS to include healthy HIV positive people with a CD4 positive T cell count of less than 200 per µl of blood. The majority of new AIDS cases in the United States are reported on the basis of a low [[T cell]] count in the presence of HIV infection (MMWR, 1992).
