On this page you can find the graph indicator definitions and explore details including the demographic category definitions, acronyms, and data sources.  

Indicator Definitions

This page lists the definitions found on the dashboard graphs. To facilitate comparison, these indicator definitions align with those set forth by the CDC.

Progress Measures Graph Indicators

Awareness of HIV Status: Percentage of people 13 years and older estimated to be living with diagnosed or undiagnosed HIV infection who are living with diagnosed HIV

Engaged in Care: Number of persons 13 years of age or older living with diagnosed HIV infection with at least one CD4, viral load, or genotype lab result by the end of the calendar year divided by the total number of persons 13 years of age or older living with diagnosed HIV

Late HIV Diagnoses: Number of persons 13 years of age or older newly diagnosed with HIV infection who were diagnosed with stage 3 HIV (AIDS) within 12 months of HIV diagnosis

Linkage to Care: Number of persons 13 years of age or older newly diagnosed with HIV with a CD4, VL, or genotype lab result within 30 days after their date of diagnoses divided by the total number of persons 13 years of age or older newly diagnosed with HIV infection

New HIV Infection Diagnoses: Number of persons 13 years of age or older newly diagnosed with HIV infection

PrEP Coverage: Number of persons aged equal to or greater than 16 years classified as having been prescribed PrEP divided by the estimated number of persons who had indications for PrEP

Viral Suppression: Number of persons 13 years of age or older living with diagnosed HIV infection with a viral load less than 200 copies/mL at the end of the calendar year divided by the total number of persons 13 years of age or older living with diagnosed HIV infection

Health Measures Graph Indicators 

Prevention

HIV Testing in Adults (BRFSS): People who answered yes to the question “Have you ever been tested for HIV? (not counting tests you may have had as part of a blood donation, including testing fluid from your mouth.)”. (Data are only available for Illinois)

HIV Testing in Youth (YRBSS): Number of surveyed high schoolers who answered yes to the question “Have you ever been tested for HIV, the virus that causes AIDS? (Do not count tests done if you donated blood.)” divided by the number who’ve had sexual intercourse. (Data are only available for Chicago)

PrEP Awareness: Percent of respondents who have heard of people who do not have HIV taking pre-exposure prophylaxis (PrEP) to reduce the risk of getting HIV

Diagnoses

CD4 Count at Diagnosis (Initial CD4 Count): The value of the first CD4 lab test conducted within 6 months of the date of diagnosis, among new HIV infection diagnoses 13 years of age or older

Late HIV Diagnoses: Number of persons 13 years of age or older newly diagnosed with HIV infection who were diagnosed with stage 3 HIV (AIDS) within 12 months of HIV diagnosis

New AIDS Diagnoses: Number of persons 13 years of age or older newly diagnosed with stage 3 HIV Infection (AIDS)

New HIV Infection Diagnoses: Number of persons 13 years of age or older newly diagnosed with HIV infection

Progression from HIV to AIDS (1-24 months): Number of persons 13 years of age or older newly diagnosed with stage 3 HIV infection (AIDS) between 30 days and two years after the date of HIV diagnosis           

Prevalence

HIV Prevalence: People living with diagnosed HIV infection 13 years of age or older, based on current address

Care and Treatment

Days Until First Suppressed Viral Load: The number of days from date of diagnosis to first VL lab result less than 200 copies/mL among persons 13 years of age or older newly diagnosed with HIV infection

Days Until Linkage to Care: The number of days from date of diagnosis to first CD4, viral load, or genotype lab result among persons 13 years of age or older newly diagnosed with HIV infection

Engaged in Care: Number of people diagnosed with HIV infection with a CD4, viral load, or genotype lab result within the most recent year

Linkage to Care: Number of people 13 years of age or older newly diagnosed with HIV infection with a CD4, viral load, or genotype lab result within XX days after their date of diagnosis

Linkage to Care within 1 Month: Number of people 13 years of age or older newly diagnosed with HIV infection with a CD4, viral load, or genotype lab result within 30 days after their date of diagnosis

New Diagnoses: Number of people  13 years of age or older newly diagnosed with HIV infection

New HIV Infection Diagnoses Virally Suppressed: Number of people 13 years of age or older newly diagnosed with HIV infection with a viral load less than 200 copies/mL 1 year after their date of diagnosis

People Living with Diagnosed HIV (PLWDH): Number of people 13 years of age or older diagnosed and living with HIV infection based on most recent address

Recent HIV Diagnoses: Number of people diagnosed with HIV infection in the previous 5 years

Retained in Care: PLWDH 13 years of age or older with a CD4, viral load, or genotype lab result at least 90 days apart and within the calendar year

Sustained Linkage: Number of people 13 years of age or older newly diagnosed with HIV infection with 2 CD4, VL, or genotype lab results conducted at least 90 days apart within a year of date of diagnosis

Sustained Viral Suppression: Number of people 13 years of age or older newly diagnosed with HIV infection with 2 viral load results less than 200 copies/mL within 1 year of their date of diagnosis

Virally Suppressed: PLWDH 13 years of age or older whose most recent viral load was less than 200 copies/mL

Deaths

Deaths Among People Living with Diagnosed HIV Infection: Number of deaths due to any cause among people 13 years of age or older living with diagnosed HIV infection

Priority Populations

Engaged in Care: Number of persons 13 years of age or older living with diagnosed HIV infection with at least one CD4, viral load, or genotype lab result by the end of the calendar year divided by the total number of persons 13 years of age or older living with diagnosed HIV

Late HIV Diagnoses: Number of persons 13 years of age or older newly diagnosed with HIV infection who were diagnosed with stage 3 HIV (AIDS) within 12 months of HIV diagnosis

Linkage to Care: Number of persons 13 years of age or older newly diagnosed with HIV with a CD4, VL, or genotype lab result within 30 days after their date of diagnoses divided by the total number of persons 13 years of age or older newly diagnosed with HIV infection

New HIV Infection Diagnoses: Number of persons 13 years of age or older newly diagnosed with HIV infection

People Living with Diagnosed HIV (PLWDH): Number of people 13 years of age or older diagnosed and living with HIV infection based on most recent address

Retained in Care: PLWDH 13 years of age or older with a CD4, viral load, or genotype lab result at least 90 days apart and within the calendar year

Sustained Linkage: Number of people 13 years of age or older newly diagnosed with HIV infection with 2 CD4, VL, or genotype lab results conducted at least 90 days apart within a year of date of diagnosis

Virally Suppressed: PLWDH 13 years of age or older whose most recent viral load was less than 200 copies/mL

Social Determinants Measures Graph Indicators

Economic Stability

Sustained Employment: The percent of respondents who are employed full-time or part-time. Respondents who were homemakers, full-time students, retired or did not answer this question were excluded

Health Care System

Condom Availability: The percent of respondents who in the past 12 months have gotten any free condoms, not just counting those given to them by a friend, relative, or sexual partner

Health Coverage: The percent of respondents who currently have health insurance or health care coverage

Justice Involved and HIV Tested: The percent of respondents who were in detention, jail, or prison, and got a test for HIV during the past 12 months

HPV Vaccination: The percent of respondents who have received a vaccine against Human Papillomavirus (HPV)

Education and Training

Condom Use Among Youth (YRBSS): Number of surveyed high schoolers who answered yes to the question “The last time you had sexual intercourse, did you or your partner use a condom” divided by the number who’ve had sexual intercourse. (Data are only available for Chicago)

Sex Education (YRBSS): The percentage of surveyed high schoolers who answered yes to the question “Have you had sexual education in school?”. (Data are only available for Chicago)

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Indicator Definitions Source: Centers for Disease Control and Prevention. Monitoring selected national HIV prevention and care objectives by using HIV surveillance data—United States and 6 dependent areas, 2018. HIV Surveillance Supplemental Report 2020;25(No. 2). http://www.cdc.gov/hiv/library/reports/ hiv-surveillance.html. Published May 2020. Accessed [4/22/2021].

Demographic Category Definitions

To ensure comparability with national data, demographic category definitions follow as described in the CDC HIV Surveillance report

Race and Ethnicity: 

In the Federal Register for October 30, 1997, the Office of Management and Budget (OMB) announced the Revisions to the Standards for the Classification of Federal Data on Race and Ethnicity. Implementation by January 1, 2003 was mandated. At a minimum, data on the following race categories should be collected: 

  • American Indian or Alaska Native 
  • Asian 
  • Black or African American 
  • Native Hawaiian or other Pacific Islander 
  • White 

Additionally, systems must be able to retain information when multiple race categories are reported. In addition to data on race, data on 2 categories of ethnicity should be collected: 

  • Hispanic or Latino 
  • not Hispanic or Latino 
“Hispanic/Latinx” individuals can be of any race and all other race/ethnicity groups are not-Hispanic (NH).

“Other/Unknown” race/ethnicity includes NH American Indian/Alaska Native, NH multiple race, people of unreported race/ethnicity, and subgroups with cases less than 5. 

Gender:

Cisgender represents people whose gender identity and/or gender expression is the same as the sex they were assigned at birth. Transgender represents people whose sex assigned at birth does not match current gender identity and/or gender expression.

Male: persons assigned “male” sex at birth and current gender identity is not “transgender female”.  

Female: persons assigned “female” sex at birth and current gender identity is not “transgender male”.

Transgender female: persons assigned “male” sex at birth and current gender identity is “transgender female.” 

Transgender malepersons assigned “female” sex at birth and current gender identity is “transgender male.” 

Age: 

For presentations of data on deaths of persons with diagnosed HIV infectionage-group assignment is determined by the person’s age at the time of death. For all other tables, the age designation refers to age at time of diagnosis.

Age-group designations for transmission categories in figures and tables displaying data on prevalence and on deaths are based on a person’s age at the end of the specified year or age at death, respectively.  

Transmission Category: 

“Heterosexual” refers to heterosexual contact transmission.

“PWID” includes people who transmit HIV through injection drug use. 

“TWSM” includes trans women who have sex with men and trans women with a history of injection drug use who have sex with men.

“MSM” includes men who have sex with men, and men with a history of injection drug use who have sex with men.

“Other/Unknown” transmission category includes perinatal transmission, blood transfusion, hemophilia, and no identified risk.  

For surveillance purposes, a diagnosis of HIV infection is counted only once in the hierarchy of transmission categories. Adults with more than 1 reported risk factor for HIV infection are classified in the transmission category listed first in the hierarchy. The exception is men who had sexual contact with other men and injected drugs; this group makes up a separate transmission category. 

Because a substantial proportion of cases of HIV infection are reported to the Centers of Disease Control and Prevention (CDC) without an identified risk factor, multiple imputation is used to assign a transmission category to these cases. Multiple imputation is a statistical approach in which each missing transmission category is replaced with a set of plausible values that represent the uncertainty about the true, but missing, value. Each resulting data set containing the plausible values is analyzed by using standard procedures, and the results from these analyses are then combined to produce the final results. In tables displaying transmission categories on this website, multiple imputation was used for adults and adolescents, but not for children (because the number of cases in children is small, missing transmission categories were not imputed).

Cell suppression is used to balance data confidentiality and accessibility. Data for demographic subcategories with less than 5 cases are suppressed and thus not displayed in graphs. If data for only one demographic subcategory is suppressed and the total number of cases is such that the suppressed value could be inadvertently disclosed through subtraction (referred to as back-calculation), then data from a second demographic subcategory with the next lowest cell size is also suppressed. 

Acronyms

The following list is a guide for how terms are defined across this dashboard. 

AA = African American  

AIDS = Acquired Immunodeficiency Syndrome  

ART= Anti-Retroviral Therapy  

BRFSS = The Behavioral Risk Factor Surveillance System

CDC = Centers for Disease Control and Prevention  

CDPH = Chicago Department of Public Health  

CI = A 95% confidence interval indicates that you can be 95% confident that the true proportion is between the two numbers

CPS = Chicago Public Schools  

eHARS= Enhanced HIV/AIDS Reporting System  

EMA = Eligible Metropolitan Area  

HIV = Human Immunodeficiency Virus  

HOPWA = Housing Opportunities for Persons with AIDS  

IDPH = Illinois Department of Public Health   

MSM = Gay, bisexual, same gender loving, and other men who have sex with men  and men who have sex with men with a history of injection drug use 

NH = Non-Hispanic  

PI = Pacific Islander  

PLWH = People Living with HIV/AIDS  

PLWDH = People Living with diagnosed HIV/AIDS  

PWID = People Who Inject Drugs

P&S Syphilis = Primary and Secondary Syphilis  

STI = Sexually Transmitted Infection 

VL = Viral Load 

YRBSS = Youth Risk Behavior Surveillance System

Data Sources

Chicago Department of Public Health Enhanced HIV/AIDS Reporting System (eHARS) (as of 9/28/2020)  

Illinois Department of Public Health HIV Surveillance Unit Enhanced HIV/AIDS Reporting System (eHARS) (as of 9/28/2020) 

Youth Risk Behavior Surveillance System (YRBSS) (as of 2019) 

The Behavioral Risk Factor Surveillance System (BRFSS) (as of 2019) 

National HIV Behavioral Surveillance (NHBS) (as of 2019)