Chlamydia trachomatis infection is a common sexually transmitted bacterial infection caused by the bacterium Chlamydia trachomatis. It primarily affects the reproductive organs, rectum, and throat, and can also cause a significant eye infection called trachoma. It is one of the most frequently reported STIs globally, particularly among young, sexually active individuals.
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Descriptions of trachoma, an eye infection caused by *C. trachomatis*, date back to ancient Egypt and Greece. The organism itself was first successfully isolated from human tissue in the early 20th century. Its recognition as a major sexually transmitted infection and a significant cause of preventable blindness gained widespread attention later in the century.
*Chlamydia trachomatis* is primarily transmitted through unprotected vaginal, anal, or oral sexual contact with an infected partner. It can also be transmitted from an infected pregnant person to their baby during childbirth, potentially causing eye infections (conjunctivitis) or pneumonia in the newborn.
Contagious Period: Varies by disease
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Single-dose vaccine developed to prevent chlamydia in koalas
University of the Sunshine CoastSep 9 2025
In a world first, a vaccine has been approved to protect Australia's endangered koalas from infection and death caused by chlamydia.
Developed by the University of the Sunshine Coast, the vaccine's approval by Australia's veterinary medicine regulator is...
Source: News-Medical.net - Read Full Article
Australia approves chlamydia vaccine for koalas
Chlamydia is responsible for about half of all koala deaths in the wild - Copyright AFP/File Saeed KHAN
Australian regulators have approved a chlamydia vaccine for koalas, researchers said Wednesday, as they seek to stamp out a sexually transmitted disease responsible for about half of all deaths o...
Source: Digital Journal - Read Full Article
A vaccine to protect Australia's koalas from chlamydia, a disease causing significant mortality, has been approved. Developed over a decade, it offers three levels of protection and could reduce koala deaths by 65%. Rollout requires more funding, with demand already high among wildlife hospitals.
F...
Source: Devdiscourse - Read Full Article
Saving shot: Australia approves chlamydia vaccine for koalas
In those areas, "infection rates within populations are often around 50% and ... can reach as high as 70% ".
Trials of the vaccine showed it reduced the likelihood of the herbivores developing chlamydia during breeding age and decreased deaths in wild populations by at least 65%.
Antibiotics were...
Source: NZ Herald - Read Full Article
We report a never seen before upsurge of Chlamydia pneumoniae (Cp) respiratory tract infections in 2024/25 in southern Germany. Regarding 43,558 Cp PCR tests analyzed, the positivity rate increased from 0.3% in 2015-2020 to 2.6% in 2024, and 2.4% in 2025 until August 2025, peaking at ≥ 6.0% with > 100 monthly cases in October and November 2024. Children aged 6-14 years were predominantly affected, and co-infections with other pathogens were frequently detected. We aim at raising awareness concerning Cp infections.
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MELBOURNE, Australia (AP) -- A regulator has approved a world-first vaccine to protect koalas from chlamydia infections, which are causing infertility and death in the iconic native species that is listed as endangered in parts of Australia.
The single-dose vaccine was developed by the University of the Sunshine Coast in Queensland state after more than a decade of research led by professor of microbiology Peter Timms.
The research showed the vaccine reduced the likelihood of koalas developing symptoms of chlamydia during breeding age and decreased mortality from the disease in wild populations by at least 65%.
The recent approval by Australia's veterinary medicine regulator means the vaccine can now be used in wildlife hospitals, veterinary clinics and in the field to protect the natio...
Read More: https://www.usnews.com/news/news/articles/2025-09-11/australia-approves-world-first-vaccine-to-save-koalas-from-chlamydia
SYDNEY (Reuters) -A vaccine to protect Australia's koalas against chlamydia has been approved for the first time, a move that scientists believe could stop the spread of the deadly disease that has ravaged populations of the beloved endangered marsupial.
The single-dose vaccine is now ready to be u...
Source: Yahoo - Read Full Article
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View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-06-03
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