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
Local health department information and state-specific prevention guidance
Our AI-powered surveillance continuously monitors Chlamydia activity across New Hampshire. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.
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For official state health alerts, vaccination locations, and public health guidance specific to New Hampshire, visit your state health department's website.
Whether you live in New Hampshire or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.
Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.
Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.
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Trusted information from leading health organizations
Official guidance from the U.S. Centers for Disease Control and Prevention
View CDC Resources →Global disease surveillance and guidelines from the World Health Organization
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: 2026-07-18
No confirmed cases reported in New Hampshire yet. Here are the latest Chlamydia reports from our global surveillance network.
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, peakin…
**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 S…
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 wi…
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 …
**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 …
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…
**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 bre…
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