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Related Concept Videos

Sexually Transmitted Infections01:26

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...
Amebiasis01:28

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 Herpes01:23

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...
Trichomoniasis01:18

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.
Infectious Diseases and Their Occurrence01:28

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...
Infection01:20

Infection

When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...

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Related Experiment Video

Updated: Jun 4, 2026

Sexual Transmission of American Trypanosomes from Males and Females to Naive Mates
13:55

Sexual Transmission of American Trypanosomes from Males and Females to Naive Mates

Published on: January 27, 2019

Changes in sexually transmitted disease.

B Hamilton-Smith

    Canadian Family Physician Medecin De Famille Canadien
    |January 29, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Sexually transmitted disease (STD) patterns are shifting, with no decrease in incidence. Public health efforts are crucial for STD eradication, as diseases like molluscum contagiosum and warts are now sexually transmitted.

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    Last Updated: Jun 4, 2026

    Sexual Transmission of American Trypanosomes from Males and Females to Naive Mates
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    Published on: January 27, 2019

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    Published on: September 3, 2012

    Area of Science:

    • Public Health
    • Infectious Diseases
    • Epidemiology

    Background:

    • Sexually transmitted disease (STD) incidence remains high despite changing patterns.
    • Nonspecific urethritis (NSU), previously unreported, is now the most common STD.
    • The epidemiological landscape of STDs is evolving, with shifts in prevalence and transmission routes.

    Purpose of the Study:

    • To analyze the changing patterns and persistent incidence of sexually transmitted diseases.
    • To highlight the emergence of common childhood illnesses as STDs.
    • To underscore the role of public health in controlling STD transmission.

    Main Methods:

    • Analysis of STD surveillance data and epidemiological trends.
    • Review of disease reporting changes, including the inclusion of nonspecific urethritis.
    • Examination of the transmission dynamics of various infectious agents.

    Main Results:

    • STD incidence has not decreased, with significant shifts in common causative agents.
    • The ratio of gonorrhea to NSU has reversed, indicating a rise in NSU.
    • Diseases like molluscum contagiosum and warts, alongside enteric infections, are increasingly transmitted sexually.

    Conclusions:

    • Eradication of STDs requires persistent and intelligent public health interventions.
    • The increasing prevalence of multisystem STDs necessitates a multidisciplinary approach involving various consultants for family physicians.
    • Addressing the evolving nature of STDs, including those with severe outcomes like AIDS, is a critical public health challenge.