The Pathology of Influenza Virus Infections - PMC
Influenza viruses are significant human respiratory pathogens that cause both seasonal, endemic infections and periodic, unpredictable pandemics. The worst pandemic on record, in 1918, killed approximately 50 million people worldwide.
Types of Influenza Viruses | Influenza (Flu) | CDC
Sep 18, 2024 · There are four types of influenza viruses: A, B, C, and D. Influenza A and B viruses cause seasonal epidemics of disease in people (known as flu season) almost every winter in the United States. Influenza A viruses are the only influenza viruses known to cause flu pandemics (i.e., global epidemics of flu disease).
Pathogenicity and virulence of influenza - PMC - PubMed Central …
Jun 23, 2023 · Influenza viruses, including four major types (A, B, C, and D), can cause mild-to-severe and lethal diseases in humans and animals. Influenza viruses evolve rapidly through antigenic drift (mutation) and shift (reassortment of the segmented viral genome).
The pathogenesis of influenza virus infections: the …
Influenza viruses cause acute respiratory inflammation in humans and symptoms such as high fever, body aches, and fatigue. Usually these symptoms improve after several days; however, the 2009 pandemic H1N1 influenza virus [influenza A(H1N1)2009] is ...
Influenza - StatPearls - NCBI Bookshelf - National Center for ...
Jan 23, 2023 · Influenza is a communicable viral disease that affects the upper respiratory tract, including upper and lower respiratory passages. A wide spectrum of influenza viruses causes it. Some of these viruses can infect humans, and some are specific to different species.
Understanding Influenza Viruses | Influenza (Flu) | CDC
Sep 9, 2024 · Two proteins (hemagglutinin and neuraminidase) on the surface of influenza viruses contain the major antigens targeted by antibodies. Antigenic characterization refers to the analysis of antigenic properties of viruses to examine their relatedness.
Influenza - National Institute of Allergy and Infectious Diseases …
Seasonal influenza, or flu, is a highly contagious respiratory illness caused by influenza viruses that infect the nose, throat and lungs. The two main types of influenza viruses—types A and B—are the viruses that typically spread in people (human …
Influenza (Seasonal) - World Health Organization (WHO)
Oct 3, 2023 · Seasonal influenza (the flu) is an acute respiratory infection caused by influenza viruses. It is common in all parts of the world. Most people recover without treatment. Influenza spreads easily between people when they cough or sneeze. Vaccination is the best way to prevent the disease.
Chapter 12: Influenza | Pink Book | CDC - Centers for Disease …
Apr 1, 2024 · Influenza is an infectious viral illness. The name "influenza" originated in 15th century Italy, from an epidemic attributed to "influence of the stars." The first documented pandemic, or worldwide epidemic, that clearly fits the description of influenza was in 1580.
The pathology of influenza virus infections - PubMed
Influenza viruses are significant human respiratory pathogens that cause both seasonal, endemic infections and periodic, unpredictable pandemics. The worst pandemic on record, in 1918, killed approximately 50 million people worldwide.