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Influenza - Wikipedia
Influenza, commonly known as the flu, is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin one to four (typically two) days after exposure to the virus and last for about two to eight days.
Influenza (Flu) | CDC
Learn about flu, including symptoms, prevention methods, and treatment options.
Influenza (flu) - Symptoms and causes - Mayo Clinic
Overview Flu, also called influenza, is an infection of the nose, throat and lungs, which are part of the respiratory system. The flu is caused by a virus. Influenza viruses are different from the "stomach flu" viruses that cause diarrhea and vomiting. Most people with the flu get better on their own. But sometimes, influenza and its complications can be deadly.
Flu (Influenza): Causes, Symptoms, Types & Treatment
What is the flu (influenza)? The flu is an illness you get from the influenza virus. It causes symptoms like head and body aches, sore throat, fever and respiratory symptoms, which can be severe. Flu is most common in winter months, when many people can get sick at once (an epidemic).
About Influenza | Influenza (Flu) | CDC
Understanding Influenza Flu is a contagious respiratory illness caused by influenza viruses that infect tissues in the nose, throat, and sometimes the lungs. It can cause mild to severe illness, and at times can lead to death. Getting a flu vaccine has been shown to prevent flu and its severe complications. Flu vaccines are updated yearly.
Influenza (seasonal) - World Health Organization (WHO)
WHO fact sheet on influenza: includes key facts, definition, symptoms, transmission, seasonal epidemics, effects, prevention, WHO response.
Flu (influenza) – influenza A and B, symptoms, vaccine | healthdirect
Influenza is a viral infection that affects your nose and throat. Find out more about the flu and how to protect yourself by getting vaccinated.
Influenza A virus - Wikipedia
Influenza A virus, or IAV, is a pathogen with strains that cause seasonal flu in humans; it can also infect birds and some mammals. [1] Strains of IAV circulate constantly in bats, pigs, horses, and dogs, while other mammals may be infected occasionally. [2][3] It has also been the cause of a number of pandemics, most notably the Spanish Flu pandemic from 1918–1920. [4] Subtypes of IAV are ...
Influenza | Definition, Symptoms, Treatment, & Prevention | Britannica
Influenza is an acute viral infection of the upper or lower respiratory tract, marked by fever, chills, and a generalized feeling of malaise. Seasonal influenza (the flu) is a major global health concern, causing annual epidemics with millions of severe cases and hundreds of thousands of deaths.
Influenza - Infectious Disease - Merck Manual Professional Edition
Influenza is a viral illness caused by influenza viruses. It most commonly leads to fever, coryza, cough, headache, and malaise. Infection may cause mortality during seasonal epidemics, particularly among high-risk patients (eg, those who are institutionalized, at the extremes of age, have cardiopulmonary insufficiency, or are in late pregnancy); during pandemics, even healthy, young patients ...
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