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Related Concept Videos

Viral Recombination00:57

Viral Recombination

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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Gene Flow02:39

Gene Flow

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Infection01:20

Infection

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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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Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
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Atypical Pneumonia01:14

Atypical Pneumonia

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Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease...
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Arboviral Encephalitis01:25

Arboviral Encephalitis

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Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
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Related Experiment Video

Updated: May 5, 2026

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

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How did cow flu start? Scientists still don't know.

Kai Kupferschmidt

    Science (New York, N.Y.)
    |March 27, 2025
    PubMed
    Summary

    The spillover of avian influenza A(H5N1) virus into dairy cattle is still not well understood a year after it was first detected. Further research is needed to determine the frequency and mechanisms of this viral transmission event.

    Area of Science:

    • Veterinary Medicine
    • Virology
    • Epidemiology

    Background:

    • The highly pathogenic avian influenza A(H5N1) virus has recently been detected in dairy cattle populations.
    • The initial spillover event and subsequent transmission dynamics within cattle remain incompletely characterized.

    Discussion:

    • Understanding the frequency and routes of H5N1 transmission in cattle is crucial for assessing potential risks to animal health and public health.
    • Investigating the factors influencing viral shedding, environmental persistence, and inter-species transmission is essential.

    Key Insights:

    • Despite ongoing investigations, the precise mechanisms and prevalence of H5N1 in dairy cattle are not yet fully elucidated.
    • The lack of comprehensive data hinders effective risk assessment and the development of targeted mitigation strategies.

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    Outlook:

    • Continued surveillance and research are necessary to unravel the complexities of H5N1 incursion into cattle.
    • Future studies should focus on epidemiological investigations, viral characterization, and host-pathogen interactions to address current knowledge gaps.