title: The incidence of AIDS-defining illnesses in 4883 patients with human immunodeficiency virus infection. Royal Free/Chelsea and Westminster Hospitals Collaborative Group.
abstract: BACKGROUND
  Acquired immunodeficiency syndrome (AIDS)-defining illnesses are known to occur at different levels of immunosuppression, and the incidence of diagnoses may also vary according to the CD4 lymphocyte count strata. Information about the incidence of disease at different levels of immunosuppression would help clinicians monitoring patients and would allow prophylaxis to be targeted at the most appropriate population.
  
  
  METHODS
  Between 1982 and July 1995, 4883 patients testing positive for the human immunodeficiency virus were seen at either the Royal Free or Chelsea and Westminster Hospitals in London, England. The incidence of each diagnosis, both overall and stratified by CD4 lymphocyte count, was calculated using a person-years analysis. Patients who had no CD4 lymphocyte counts measured during follow-up were excluded from the analysis.
  
  
  RESULTS
  During a median follow-up period of 27.6 months, 3875 AIDS-defining illnesses were reported in 1713 patients. The incidence of AIDS-defining illnesses ranged from 6.22 per 100 person-years of follow-up for Pneumocystis carinii pneumonia (95% confidence interval, 5.74-6.70) to 0.37 for extrapulmonary tuberculosis (95% confidence interval, 0.26-0.48). The incidence of each AIDS-defining illness increased as the CD4 lymphocyte count declined; diagnoses such as cytomegalovirus and Mycobacterium avium-intracellulare complex infection had a low incidence at CD4 lymphocyte counts above 0.05x10(9)/L (50/mm3), while Kaposi sarcoma, P carinii pneumonia, and esophageal candidiasis had a high incidence throughout all CD4 lymphocyte count strata.
  
  
  CONCLUSIONS
  This study provides important information about the risk of AIDS-defining illnesses at lower CD4 lymphocyte counts, enabling disease-specific prophylaxis to be targeted at the most appropriate population. In the future, as more prophylactic therapies are developed, this study will provide historical data of the incidence of diseases before specific prophylaxis was introduced.
authors.affiliation: Department of Primary Care and Population Sciences and Thoracic Medicine, Royal Free Hospital School of Medicine, London, England.
authors.forename: A
authors.initials: A
authors.lastname: Mocroft
authors.forename: M
authors.initials: M
authors.lastname: Youle
authors.forename: A N
authors.initials: AN
authors.lastname: Phillips
authors.forename: R
authors.initials: R
authors.lastname: Halai
authors.forename: P
authors.initials: P
authors.lastname: Easterbrook
authors.forename: M A
authors.initials: MA
authors.lastname: Johnson
authors.forename: B
authors.initials: B
authors.lastname: Gazzard
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000453:epidemiology* / Q000276:immunology*; D000163:Acquired Immunodeficiency Syndrome / Q000175:diagnosis* / Q000276:immunology*; D000328:Adult; D018791:CD4 Lymphocyte Count; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008131:London / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D012737:Sex Factors