Estimates of New HIV Infections in the United States, 2006-2009
In August 2011, the Centers for Disease Control and Prevention released new estimates of the annual number of new HIV infections (HIV incidence) in the United States. The estimates, for 2006 through 2009, are the first multi-year estimates using CDC's national HIV incidence surveillance methodology, which is based on direct measurement of new HIV infections using a laboratory test (the BED HIV-1 Capture Enzyme Immunoassay) that can classify new diagnoses as either recent or long-standing HIV infections. The estimates were published online in the scientific journal PLoS ONE (http://dx.plos.org/10.1371/journal.pone.0017502).
The new estimates suggest that overall HIV incidence in the United States has been relatively stable at approximately 50,000 annual infections between 2006 and 2009. Each year, the largest number of new HIV infections was among white men who have sex with men (MSM)* followed closely by black MSM. Hispanic MSM and black women were also heavily affected. Over the four year period, new HIV infections appear to be relatively stable among all populations except young MSM. The overall increase among young MSM was driven by a 48 percent increase in HIV infections among young black MSM during the four-year time period.
In addition to providing the first estimates for 2007, 2008 and 2009, CDC has updated its earlier estimate of HIV incidence for 2006 (previously 56,300). The new, lower estimate reflects refined research methods and more data available due to reporting delays. While these HIV incidence estimates are based on the best data currently available, CDC will continue to refine estimates over time as improvements in methods or additional data are available.
Announced in July 2010, the National HIV/AIDS Strategy calls for prioritizing prevention efforts in the populations where HIV is most heavily concentrated -- gay and bisexual men of all races and ethnicities, African Americans and Hispanics/Latinos -- and for alleviating racial and ethnic disparities. To achieve the strategy's goals, CDC is implementing "High-Impact Prevention," a new approach designed to maximize available HIV prevention resources and have the greatest impact on the U.S. HIV epidemic.
Implications of New Estimates
CDC's new estimates underscore two key HIV prevention challenges that require urgent action:
Key Findings: A Closer Look
Data Suggest Overall HIV Incidence Relatively Stable
CDC estimates that there were 48,600 (Confidence Interval [CI]: 42,400-54,700) new HIV infections in the United States in 2006, 56,000 (CI: 49,100-62,900) in 2007, 47,800 (CI: 41,800-53,800) in 2008 and 48,100 (CI: 42,200-54,000) in 2009.
The new estimates update CDC's original HIV incidence estimate for 2006 (previously 56,300 [CI: 48,200-64,500]). The new lower estimate reflects refined statistical modeling and the addition of data now available due to reporting delays (see Methods box below for additional information). CDC will continue to add new data and improve its research methods over time. As a result, HIV incidence estimates may continue to be refined in the future.
This article was provided by U.S. Centers for Disease Control and Prevention. Visit the CDC's website to find out more about their activities, publications and services.
Add Your Comment:
(Please note: Your name and comment will be public, and may even show up in
Internet search results. Be careful when providing personal information! Before
adding your comment, please read TheBody.com's Comment Policy.)