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Sexually Transmitted Infections

Sexually Transmitted Infections

Sexually transmitted infections (STIs) are diseases transmitted primarily through unsafe sexual interactions. Bacteria, viruses, or parasites cause them and can result in severe health complications if untreated.ChlamydiaThe bacterium Chlamydia trachomatis is responsible for the disease Chlamydia, the most common STI in the United States. This peculiar pathogen requires human cells to reproduce, residing intracellularly. The initial infection often goes unnoticed because it typically does not...

Amebiasis

Amebiasis

Entamoeba histolytica, a protozoan parasite, is responsible for intestinal and extraintestinal amebiasis. Though a significant proportion of infections remain asymptomatic, approximately 50 million individuals annually are estimated to present with clinical disease, resulting in up to 100,000 deaths globally. The disease burden is disproportionately high in regions with lower socioeconomic status, such as parts of India, Africa, Mexico, and Latin America.Etiology and TransmissionThe infective...

Genital Herpes

Genital Herpes

Genital herpes is a sexually transmitted infection primarily caused by herpes simplex virus type 2 (HSV-2), though herpes simplex virus type 1 (HSV-1) is increasingly implicated in genital infections, particularly among younger populations. Transmission occurs mainly through sexual contact, with asymptomatic viral shedding serving as a major route of spread. This characteristic makes HSV-2 difficult to control at a population level, as individuals may unknowingly transmit the virus even in the...

Infectious Diseases and Their Occurrence

Infectious Diseases and Their Occurrence

Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable temporal or...

Trichomoniasis

Trichomoniasis

Trichomonas vaginalis is a flagellated protozoan parasite and the causative agent of trichomoniasis, one of the most prevalent non-viral sexually transmitted infections in the United States. This extracellular parasite primarily colonizes the lower genitourinary tract in women—particularly the vagina—and in men, the urethra and prostate. Its structural and functional adaptations enable its survival, motility, and pathogenicity within the host environment.Structural Features and Host EntryT.

Healthcare Associated Infections II: Preventive Measures

Healthcare Associated Infections II: Preventive Measures

Essential infection prevention measures are based on the knowledge of the infection chain, the modes of transmission in healthcare settings, and the use of the best practices in all healthcare settings. Compulsory public reporting of healthcare-associated infection rates is needed to allow individuals and the community to make informed choices regarding selecting a healthcare facility.
The best practices for preventing healthcare-associated infections include hand hygiene, patient risk...

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Related Experiment Video

Updated: Jun 30, 2026

Procedures for In Vitro Cultivation of Treponema pallidum, the Syphilis Spirochete

Procedures for In Vitro Cultivation of Treponema pallidum, the Syphilis Spirochete

Published on: January 24, 2025

[Syphilis in 2008: practical aspects and controversies].

F Frippiat¹, J-B Giot, K Chandrikakumari

¹Services des maladies infectieuses et d'immunologie, Centre référence sida, Département de médecine interne, CHU Sart Tilman, Liège, Belgique. f.frippiat@chu.ulg.ac.be

Revue Medicale Suisse

|September 26, 2008

Summary

Syphilis is rising in developed nations, especially among men who have sex with men and those with lower socioeconomic status. Early diagnosis and penicillin treatment are key, with careful follow-up for all patients.

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Feeding of Ticks on Animals for Transmission and Xenodiagnosis in Lyme Disease Research

Feeding of Ticks on Animals for Transmission and Xenodiagnosis in Lyme Disease Research

Published on: August 31, 2013

Area of Science:

Infectious Diseases
Epidemiology
Public Health

Context:

Increasing syphilis incidence rates globally, particularly in developed countries.
Syphilis affects diverse populations, including men who have sex with men and individuals with low socioeconomic status.
Neurosyphilis can manifest at any disease stage, complicating diagnostic and treatment decisions, especially in HIV-positive individuals.

Purpose:

To outline current understanding of syphilis epidemiology, clinical presentations, and management.
To address the diagnostic challenge of neurosyphilis and lumbar puncture timing.
To emphasize the importance of penicillin as the primary treatment and the need for follow-up.

Summary:

Syphilis incidence is rising in economically advanced countries, with specific at-risk populations identified.
Clinical manifestations range from early to late stages, with neurosyphilis posing diagnostic questions, particularly regarding lumbar puncture in HIV patients.
Penicillin remains the first-line treatment, necessitating specialist consultation for alternatives and requiring long-term clinical and serological monitoring for relapse or reinfection.

Impact:

Highlights the need for targeted public health interventions and screening programs.
Informs clinical decision-making regarding neurosyphilis diagnosis and management.
Underscores the importance of comprehensive STI screening and partner management in syphilis cases.