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Related Concept Videos

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...
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...
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...
Reservoir of Infection01:30

Reservoir of Infection

Infectious diseases arise from intricate interactions between pathogens and their reservoirs. A reservoir of infection refers to the natural habitat where a pathogen lives, grows, and multiplies, serving as a continual source of infection. Reservoirs are broadly classified as either living or nonliving, and each plays a unique role in disease transmission, significantly influencing public health interventions and control strategies.Humans act as reservoirs for a wide array of pathogens,...
Transmission of Pathogens01:24

Transmission of Pathogens

Pathogens spread from their reservoirs to susceptible hosts through three main routes: contact transmission, vehicle transmission, and vector transmission. Each route involves distinct mechanisms of transfer.Contact TransmissionThis category includes direct contact, indirect contact, and droplet transmission:Direct contact involves immediate physical interaction between individuals—such as a handshake—which can spread pathogens like Streptococcus pyogenes, the bacterium responsible for...
Smallpox01:24

Smallpox

Smallpox is a severe contagious disease caused by the Variola major virus, a double-stranded DNA member of the Poxviridae family.Variola major transmission occurs primarily via inhalation of virus-laden droplets or direct contact with infectious scabs. The incubation period averages approximately seven days, although it may range from 7 to 17 days depending on the inoculum and host factors.Clinically, the prodromal phase is marked by an abrupt onset of high fever, malaise, headache, and myalgia.

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Related Experiment Video

Updated: Jul 11, 2026

An In vitro Co-infection Model to Study Plasmodium falciparum-HIV-1 Interactions in Human Primary Monocyte-derived Immune Cells
07:39

An In vitro Co-infection Model to Study Plasmodium falciparum-HIV-1 Interactions in Human Primary Monocyte-derived Immune Cells

Published on: August 15, 2012

Infectious diseases in primitive societies.

F L Black

    Science (New York, N.Y.)
    |February 14, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Serological studies reveal infectious disease patterns in Amazonian tribes. Acute-phase infectious diseases likely emerged with advanced cultures, impacting human genetics recently.

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    Area of Science:

    • Epidemiology
    • Anthropology
    • Genetics

    Background:

    • Infectious diseases significantly impact human populations, particularly isolated groups.
    • Understanding disease dynamics is crucial for public health and evolutionary studies.

    Purpose of the Study:

    • To determine the incidence of various infectious diseases in Amazonian Indian tribes.
    • To categorize infectious diseases based on their persistence and transmission patterns.
    • To explore the historical impact of infectious diseases on human genetic selection.

    Main Methods:

    • Serological testing was employed to detect disease incidence.
    • Diseases were classified based on their infectious period (prolonged vs. acute phase).
    • Historical and cultural factors were considered in disease perpetuation models.

    Main Results:

    • Two distinct categories of human-specific infectious diseases were identified.
    • Endemic diseases persist long-term within individuals.
    • Diseases infectious only during the acute phase exhibit rapid die-off post-introduction.

    Conclusions:

    • Diseases infectious only in the acute phase may not have been sustainable before advanced cultures.
    • The advent of advanced cultures likely facilitated the perpetuation of acute-phase diseases.
    • These diseases may have exerted selective genetic pressure on humans relatively recently.