Prevalence and Incidence of Chlamydia
Chlamydia Prevalence: Book Excerpts
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?
-
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)
- 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)
- 702,093 new cases of Chlamydia occurred annually in the US 2000 (Health, United States: 2002, NCHS, CDC)
- 30,763 new cases of chlamydia in England and Wales 2001(PHLS, London, 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
Prevalence/Incidence of Chlamydia: Online Medical Books
16 MEDICAL BOOKS ONLINE!
Review excerpts from medical books online, free, without registration,
for more information about the prevalence and/or incidence of Chlamydia.
Chlamydial infections:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Transmission of C. trachomatis primarily follows vaginal or rectal intercourse or orogenital contact with an infected person. Because symptoms of chlamydial infections commonly appear late in the disease’s course, sexual transmission of the organism typically occurs unknowingly. Children born of mothers who have chlamydial infections may contract associated conjunctivitis, otitis media, and pneumonia during passage through the birth canal.
Chlamydial infections are the most common sexually transmitted diseases in the United States, affecting an estimated four million people in the United States each year.
» READ BOOK EXCERPT ONLINE »
Source: Professional Guide to Diseases (Eighth Edition), 2005
Chlamydial Infections:
Chlamydial Infections - epidemiology
(The 5-Minute Pediatric Consult)
- C. trachomatis:
- There are at least 15 serologically distinct variants (serovars).
- C. trachomatis is the most frequent cause of epididymitis in sexually active young men.
- Incubation period: 5–14 days after delivery for conjunctivitis
- The possibility of sexual abuse should be considered in older infants and children with vaginal, urethral, or rectal C. trachomatis.
- C. psittaci (psittacosis/ornithosis):
- Both healthy and sick birds can transmit the bacteria via the airborne route by their excrement or secretions.
- Important sources of human disease are parakeets, parrots, macaws, pigeons, and turkeys.
- Workers in poultry slaughter plants, poultry farms, pet shops, laboratory workers, and pet owners are at high risk.
- Although usually rare in children, it should be considered in any child with environmental exposure who develops an atypical pneumonia. The incubation period is 7–14 days.
- C. pneumoniae: Antigenically, morphologically, and genetically distinct from other chlamydiae
- It is assumed to be transmitted from person to person through aerosolized respiratory secretions.
- C. pneumoniae has recently been associated with atherosclerotic cardiovascular disease. Limited evidence associates C. pneumoniae with asthma and bronchospasm, Alzheimer disease, multiple sclerosis, Kawasaki disease, HIV and other immune disorders, malignancy, otitis media, and episodes of acute chest syndrome in patients with sickle cell disease.
- Coinfection with other respiratory pathogens, especially M. pneumoniae and Streptococcus pneumoniae, is frequent.
- Incubation period: ~21 days
Chlamydial Infections - incidence
C. trachomatis:
- This is the most common reportable sexually transmitted infection in the US. The number of new infections exceeds 4 million annually.
- Rates of infection in adolescent girls are 15–20%.
- 23–55% of all cases of nongonococcal urethritis in men are caused by C. trachomatis. Up to 50% of men with gonorrhea may be coinfected with C. trachomatis.
- C. trachomatis pneumonia usually develops in infected infants <2 months of age (2 weeks to 5 months). The contagiousness of pulmonary disease is unknown, but is considered low.
- Half of the neonates born to infected mothers via vaginal delivery will acquire C. trachomatis. Conjunctivitis may develop in 30–50%. Pneumonia may develop in up to 30% of infants with nasopharyngeal infection.
- Ocular trachoma caused by serovars A, B, Ba, and C is the most common cause of preventable blindness in the world, but is rare in the US.
Chlamydial Infections - prevalence
C. pneumoniae:
- Increased prevalence rates of C. pneumoniae specific antibody have been documented in school-age children, reaching 30–45% in adolescents.
- Studies of CAPs in children have found C. pneumoniae in 6–19% of cases. Evidence of lower respiratory tract infection has been found in 0–18% of the pediatric population.
- Most infections are mild or asymptomatic. Acute infection does not appear to vary by season. A carriage state has been detected in 2–5% of patients. Recurrent infection is common, especially in adults.
>
» READ BOOK EXCERPT ONLINE »
Source: The 5-Minute Pediatric Consult, 2008
Vaginitis:
Vaginitis - epidemiology
(The 5-Minute Pediatric Consult)
- Candidiasis may present cyclically with menses, possibly owing to changing estrogen levels.
- Gonorrhea is more likely to be symptomatic at the time of menses owing to easier access to the upper reproductive tract.
- Body mass index (BMI) at the extremes is associated with increased risk of vulvovaginitis.
- The epidemiology of bacterial vaginosis is not well known because it is not a reportable disease, and 50% of cases may be asymptomatic.
Vaginitis - incidence
The exact incidence of vaginitis is unknown.
» READ BOOK EXCERPT ONLINE »
Source: The 5-Minute Pediatric Consult, 2008
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.
Join our panel of experts for a discussion of gonorrhea, a sexually transmitted disease that may affect as many as 2 million people each year in the...
The first step in effective treatment for vulvovaginal candidiasis is correct diagnosis to rule out bacterial vaginitis and establish species of...
Appropriate treatment for vulvovaginal candidiasis depends on a variety of factors including severity of symptoms, species of yeast and patient...
Chlamydia is often refered to, and joked about, as "the clap". But for the 3 million people who are infected with it each year in the U.S. alone,...
See full list of 4 related videos
» Next page: Videos related to Chlamydia
Rate This Website
What do you think about the features of this website?
Take our user survey and have your say:
Website User Survey
Medical Tools & Articles:
Next articles:
Tools & Services:
Medical Articles:
Forums & Message Boards
- Ask or answer a question at the Boards:
