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Seattle & King County
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Home » HIV/AIDS » Health Educators Toolbox » HIV Background Booklet » Epidemiology

HIV/AIDS Program
How many people have HIV/AIDS?

Globally, 34.3 million adults and children were living with HIV/AIDS at the end of 1999. Of the 33 million adults living with HIV/AIDS, 15.7 million were women. About 95 percent of those infected with HIV live in developing countries, where the cost of combination therapies to stall HIV and AIDS progression is prohibitive. In 1999, 5.4 million people--of whom 2.3 million were women--were newly infected with HIV, and 2.8 million people died of AIDS. Since the beginning of the epidemic, there have been 18.8 million AIDS deaths and 13.2 million AIDS orphans. Sub-Saharan Africa is being devastated by AIDS with as many as 1 in 4 persons infected in some countries. In nine African countries, HIV/AIDS will erase 17 years of potential gains in life expectancy, meaning that instead of reaching 64 years, by 2010-2015 life expectancy in these countries will regress drop to an average of just 47 years. The next areas that are poised for disaster are SE Asia, India and Russia/Eastern Europe.

Adults and children living with HIV/AIDS -- total: 34.3 million (1999)

In the United States:

The CDC estimates that between 800,000 and 900,000 people in the U.S. are living with HIV/AIDS. Of them, a record (& increasing) number-- 297,136 -- are estimated to be living with AIDS. Public education and prevention efforts and newer, more effective therapies have helped slow the annual increase in the number of AIDS cases.

The rate of new infections in the United States AIDS deaths have also declined in recent years, although this trend too has been slowing. Yet despite declining AIDS cases and deaths, the rate of new HIV infections has not declined, remaining steady at about 40,000 annually.

The picture on the left, illustrates that as the number of new infections in the United States stays at about 40,000 and the number of people dying of AIDS lessens, the number of HIV+ individuals in the U.S. is actually growing.

The disproportionate impact of the epidemic on racial and ethnic minorities has been increasing, and minority Americans now represent the majority both of new HIV and AIDS cases, and of those living with AIDS. In 1998, African Americans represented 45 percent of new AIDS cases yet accounted for only 12 percent of the total population. Latino/a Americans represented 20 percent of new AIDS cases but only 13 percent of the population. African Americans and Latino/a Americans represent 40 and 20 percent, respectively, of those living with AIDS.

The proportion of AIDS cases reported among women each year has more than tripled, from 7 percent in 1986 to 23 percent in 1998. African American women account for 62 percent of AIDS cases reported among all women.

HIV/AIDS is also increasingly becoming a disease of young adults. At least one-half of all new HIV infections are estimated to be among people under 25, and the majority of young people are infected heterosexually.

Why are homosexuals and people of color disproportionately affected by HIV?

Although we know that HIV transmission is caused by specific behavior, transmission is also much more complicated than individual behavior. Transmission does not occur in a vacuum; racism, sexism, homophobia, economic status and other socio-economic determinates all play a role in the spread of this epidemic.

chances of becoming infected
Taking the simplistic example above, if both persons have 4 unprotected sex acts, their individual behavior will be exactly the same, but their risk of infection will be very different. Person number 1 will have a high chance of becoming HIV infected and person 2 will have a low chance of becoming infected. The context changes their risk.

In King County:

HIV is best thought of as many epidemics among population subgroups because of striking variations in infection rates. Gay and bisexual men in King County who are currently sexually active are at high risk, with an estimated 14-21% infected. Heterosexual injection drug users have a relatively low prevalence of infection (<3%). HIV infection also varies by race--higher rates are observed in African Americans, Native Americans, and Hispanics compared to Whites and Asians. HIV is not distributed uniformly in the county, with the majority of infections being in Seattle residents. These variations emphasize the need to tailor HIV prevention programs to specific populations at risk.

Public Health estimates that between 6,000 and 9,000 (midpoint=7,500) King County residents have HIV infection. This estimate is based on the CDC's national HIV prevalence estimate published in 1996.

chances of becoming infected

  • Men who have sex with men who are currently sexually active have a high prevalence of HIV infection, estimated at 14-21%.
  • Men who have sex with men who also inject drugs have the highest HIV seroprevalence with about one-third 40% infected. This is primarily due to higher prevalence among men who inject amphetamines compared to those who inject other drugs.
  • The prevalence of HIV among heterosexual drug injectors is estimated to be less than 3%.
  • Estimated HIV prevalence is higher among African Americans, Hispanics, and Native Americans (each about 1%) than among Whites (0.5%) and Asian/Pacific Islanders (0.1%).
  • Data from the survey of childbearing women through May, 1995 showed that one in about every 2,400 King County women giving birth was HIV infected (0.042%). This rate was stable between the start of the survey in 1989 and its conclusion in May, 1995.
  • Data from the survey of childbearing women through May, 1995 showed that the percentage of African American women who tested HIV positive was 10 times that of White women (0.3% vs. 0.03%, respectively).
  • AIDS case data indicate marked geographic variation within King County, and a similar distribution of HIV infection is likely. The AIDS rate in recent years in Seattle is 6 times that of the remainder of the county. Within Seattle, the Central and North Central areas have the highest rates.
related sites

HIV/AIDS Epidemiology ReportsHIV/AIDS Quarterly Statistical Reports Reports about HIV prevention or HIV care services and articles from the Seattle-based adult and pediatric HIV/AIDS clinical trials units and the HIV Vaccine Evaluation Unit.

Health Providers homepage
Health provider and patient
Information for King County health providers including reportable disease conditions and latest case updates for selected diseases.

Drug trends reportsData and research reports for King County residents. Includes reports and statistics on ethnicity and health.

bar chartsPublic Health News Releases From 1999 to present, our press release archives detail important events by our agency.

Updated: Wednesday, November 19, 2003 at 11:39 AM

All information is general in nature and is not intended to be used as a substitute for appropriate professional advice. For more information please call 206-296-4600 (voice) or 206-296-4631 (TTY Relay service). Mailing address: ATTN: Communications Team, Public Health - Seattle & King County, 999 3rd Ave., Suite 1200, Seattle, WA 98104 or click here to email us.

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