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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.
The bacteria are mesophilic and grow best at temperatures between 35 and 37 °C. [1] H. influenzae was first described in 1893 [2] [3] by Richard Pfeiffer during an influenza pandemic [4] when he incorrectly identified it as the causative microbe, which is why the bacteria was given the name "influenzae".
1957–1958 influenza pandemic ('Asian flu') 1957–1958 Worldwide Influenza A virus subtype H2N2: 1–4 million [187] [203] [204] 1960–1962 Ethiopia yellow fever epidemic 1960–1962 Ethiopia: Yellow fever: 30,000 [205] Seventh cholera pandemic: 1961–present Worldwide Cholera (El Tor strain) 36,000 [citation needed] [206] Hong Kong flu ...
An infection is the invasion of tissues by pathogens, their multiplication, and the reaction of host tissues to the infectious agent and the toxins they produce. [1] An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection.
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza, caused either by Influenza A or by Influenza B. The season occurs during the cold half of the year in temperate regions; November through February in the northern hemisphere and May to October in the southern hemisphere.
Orthomyxoviridae (from Ancient Greek ὀρθός (orthós) 'straight' and μύξα (mýxa) 'mucus') [1] is a family of negative-sense RNA viruses.It includes seven genera: Alphainfluenzavirus, Betainfluenzavirus, Gammainfluenzavirus, Deltainfluenzavirus, Isavirus, Thogotovirus, and Quaranjavirus.
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza (flu). The season occurs during the cold half of the year in each hemisphere . It takes approximately two days to show symptoms.
For example, the current "swine flu" or H1N1 virus is a new strain of an old form of flu, known for centuries as Asian flu based on its origin on that continent. From 1918 to 1920, a post- World War I global influenza epidemic killed an estimated 50–100 million peens, including half a million in the United States alone. [ 10 ]