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Influenza01:27

Influenza

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Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...
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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...
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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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Nasal Wipes for Influenza A Virus Detection and Isolation from Swine
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Avian influenza overview December 2025-February 2026.

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    Summary
    This summary is machine-generated.

    Highly pathogenic avian influenza (HPAI) A(H5) detections in European birds remain high but are declining. While human infections are rare, increased circulation in wild birds raises concerns for exposed populations.

    Keywords:
    HPAIavian influenzacaptive birdshumansmonitoringpoultrywild birds

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    Area of Science:

    • Veterinary Virology
    • Zoonotic Disease Epidemiology
    • Public Health Surveillance

    Background:

    • High pathogenic avian influenza (HPAI) A(H5) virus detections have been reported in numerous European countries between November 2025 and February 2026.
    • Wild bird populations, particularly waterfowl, show a high prevalence of HPAI A(H5), with significant spillover into domestic poultry and other animals.

    Purpose of the Study:

    • To report the epidemiological situation of HPAI A(H5) in Europe during the specified period.
    • To assess the risk of avian influenza virus transmission to mammals, including humans.

    Main Methods:

    • Surveillance data collection on HPAI A(H5) detections in domestic and wild birds across 32 European countries.
    • Analysis of HPAI A(H5) virus circulation patterns, species affected, and geographical distribution.
    • Monitoring of human cases and potential exposure routes.

    Main Results:

    • 2514 HPAI A(H5) detections reported in European birds (406 domestic, 2108 wild).
    • Over 90% of poultry detections linked to primary introduction from wild birds; waterfowl species significantly affected.
    • Increased detections in mammals noted, including a potential spillover event to dairy cattle.
    • 10 human avian influenza virus infections reported in Cambodia and China, with exposure to poultry environments.

    Conclusions:

    • HPAI A(H5) virus circulation in European wild birds remains a significant concern, impacting poultry and increasing mammal exposure.
    • While human infections are rare and no human-to-human transmission is documented, the risk to occupationally exposed individuals is low-to-moderate.
    • Continued surveillance and biosecurity measures are crucial to mitigate HPAI spread and potential zoonotic transmission.