Categories
This graph uses the CDC categorization for adult/adolescent AIDS cases; it
does not include pediatric (<13 years old) cases.
- Men who have sex with men
- Injecting drug use (female and heterosexual male)
- Men who have sex with men and inject drugs
- Hemophilia/coagulation disorder
- Heterosexual contact with a person with, or at increases risk for,
HIV infection
- Receipt of transfusion of blood, blood components, or tissue
- Other/undetermined
The heterosexual contact category is subdivided into:
- Sex with injecting drug user
- Sex with bisexual male (for females only)
- Sex with person with hemophilia
- Sex with transfusion recipient with HIV infection (grouped with the
above category in the graph)
- Born in Pattern-II country (category eliminated in 1993)
- Sex with HIV-infected person, risk not specified
For surveillance purposes, AIDS patients are grouped into a hierarchy
of exposure categories. Persons with more than one reported mode of
exposure to HIV are counted in the exposure category listed first in
the hierarchy, except for persons with a history of both sexual contact
with other men and injecting drug use. They are counted in a separate
category.
"Pattern II" is a term adopted by the World Health Organization, and
refers to countries with a distinctive pattern of HIV transmission. It
is observed in areas of central, eastern, and southern Africa and in
some Caribbean countries. In these countries, most of the reported
cases occur in heterosexuals; the male to female ratio is approximately
1 to 1; and perinatal transmission is more common than in other areas.
Injecting drug use and homosexual transmission either do not occur or
occur at low levels.
Other/undetermined" cases are in persons with no reported history of
exposure to HIV through any of the routes listed in the hierarchy of
exposure categories. Undetermined cases include persons who are
currently under investigation by local health department officials;
persons whose exposure history is incomplete because of death, refusal
to be interviewed, or loss to follow-up; and persons who were
interviewed or for whom other follow-up information was available and
no exposure mode was identified.
WebCounter: 
Ken Shirriff:
shirriff@eng.sun.com
This page:
http://www.righto.com/java/statscat.html
Copyright 2000 Ken Shirriff. Last updated 3/13/2001.
Java and other Java-based names are trademarks of Sun Microsystems,
Inc. and refer to Sun's family of Java-branded technologies.
Use of this software is subject to the terms of the
license agreement.