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Diseases » Chlamydia » Prevalence
 

Prevalence and Incidence of Chlamydia

Incidence (annual) of Chlamydia:

estimated 4 million cases (NIAID/CDC) [4-8 million cases] including undiagnosed (about 600,000 diagnosed). ... see also overview of Chlamydia.

Incidence Rate:

approx 1 in 68 or 1.47% or 4 million people in USA [Source statistic for calcuation: "estimated 4 million cases (NIAID/CDC) [4-8 million cases] including undiagnosed (about 600,000 diagnosed)." -- see also general information about data sources]

Incidence extrapolations for USA for Chlamydia:

4,000,000 per year, 333,333 per month, 76,923 per week, 10,958 per day, 456 per hour, 7 per minute, 0 per second. [Source statistic for calculation: "estimated 4 million cases (NIAID/CDC) [4-8 million cases] including undiagnosed (about 600,000 diagnosed)." -- see also general information about data sources]

Undiagnosed prevalence of Chlamydia:

estimated 3.4 million cases (based in NIAID/CDC estimates with only about 600,000 to 800,000 reported from 4 million cases) ... see also misdiagnosis of Chlamydia.

Undiagnosed prevalence rate:

approx 1 in 80 or 1.25% or 3.4 million people in USA [about data] ... Note: this rate calculation uses the following statistic: estimated 3.4 million cases (based in NIAID/CDC estimates with only about 600,000 to 800,000 reported from 4 million cases)

Prevalance of Chlamydia:

Though 526,653 cases were reported in 1997, an estimated 3 million cases occur annually. (Source: excerpt from Chlamydia in the US: DSTD) ... In 1997, 526,653 chlamydial infections were reported to the CDC, a case rate of 207 per 100,000 population. (Source: excerpt from Sexually Transmitted Diseases Statistics, NIAID Fact Sheet: NIAID)

Worldwide prevalence of Chlamydia:

Worldwide, an estimated 89 million new chlamydial infections occurred in 1997. (Source: excerpt from Sexually Transmitted Diseases Statistics, NIAID Fact Sheet: NIAID)

Prevelance of Chlamydia discussion:

How are adolescents and young women affected?

  • As many as 1 in 10 adolescent girls tested for chlamydia is infected.

  • Based on reports to CDC provided by states that collect age-specific data, teenage girls have the highest rates of chlamydial infection. In these states, 15- to 19-year-old girls represent 46% of infections and 20- to 24-year-old women represent another 33%. These high percentages are consistent with high rates of other STDs among teenagers.

  • Among women entering the Job Corps in 1997, chlamydia rates ranged from 4 - 14% by state (20,000 entrants are screened annually). Chlamydial infection is widespread geographically and highly prevalent among these economically disadvantaged young women between 16 and 24 years old.

(Source: excerpt from Chlamydia in the US: DSTD)

Incidence of Chlamydia:

This infection is now the most common of all bacterial STDs, with an estimated 4 to 8 million new cases occurring each year. (Source: excerpt from Sexually Transmitted Diseases, NIAID Fact Sheet: NIAID)

Prevelance statistics for Chlamydia:

The following statistics relate to the prevalence of Chlamydia:

  • 2 million people currently affected (CDC)
  • 9.51% of female Army recruits in a study by Charlotte Gaydos as reported by Reader's Digest1
  • 2 million people currently infected in America (Tracking The Hidden Epidemics, CDC, 2002)
  • Estimated 2 million cases in the USA 2002 (Trends in STD’s in the US, CDC, 2002)
  • Estimated 1 in 10 adolescent girls in the US (The National Women’s Health Information Center, CDC)
  • Estimated 1 in 20 women of reproductive age in the US (The National Women’s Health Information Center, CDC)
  • 50% likelihood of infection by the time women reach 30 in the US (The National Women’s Health Information Center, CDC)
  • 2 million people currently infected in America (Tracking The Hidden Epidemics, CDC, 2002)
  • more statistics...»

Incidence statistics for Chlamydia:

The following statistics relate to the incidence of Chlamydia:

  • 607,602 reported cases (1998)
  • Estimated 3 million annual cases including undiagnosed cases (CDC)
  • 656,721 annual cases notified in USA 1999 (MMWR 1999)
  • 150.74 per 100,000 in Canada 20002
  • Estimated 3 million new cases each year (including undiagnosed) in the USA 2002 (Trends in STD’s in the US, CDC, 2002)
  • more statistics...»

Death statistics for Chlamydia:

The following statistics relate to deaths and Chlamydia:

  • Chlamydia death statistics for various regions worldwide:
    • About 1,000 deaths from Chlamydia in Africa 2002 (The World Health Report, WHO, 2004)
    • About 8,000 deaths from Chlamydia in South East Asia 2002 (The World Health Report, WHO, 2004)
    • About 1,000 deaths from Chlamydia in Eastern Mediterranean 2002 (The World Health Report, WHO, 2004)
  • more statistics...»

More Statistics about Chlamydia:

  • Deaths and related statistics
  • All statistics for Chlamydia

    About prevalence and incidence statistics:

    The term 'prevalence' of Chlamydia usually refers to the estimated population of people who are managing Chlamydia at any given time. The term 'incidence' of Chlamydia refers to the annual diagnosis rate, or the number of new cases of Chlamydia diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.

    Footnotes:
    1. Reader's Digest, February 2004, "10 Diseases Doctors Miss", page 120
    2. Notifiable Diseases Online, PPHB, Canada, 2000

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