Influenza virus

Topics: Influenza, Infectious disease, Immune system Pages: 3 (986 words) Published: February 9, 2014
How worried are you about the Influenza Virus?

The Influenza virus, commonly known as the flu, is a viral disease that can be infectious in mammals and birds, it´s caused by RNA viruses. This disease is most common between the months of October and May, it can last from three days to five days; it´s an acute disease, because manifests quickly and last a short time. There are three types of Influenza according to how severe they are; Type A: The most severe type with the most acute symptoms. Type B: Similar symptoms to type A, but not as serious. Type C: The mildest one and with symptoms similar to a cold.

The Influenza virus can be transmitted mainly by two different ways: by direct transmission (when an infected person sneezes the mucus goes directly into the person that is closest); by contaminated air (when someone inhales the “aerosols” produced by an infected person coughing or sneezing). The disease mainly affect the nose, the throat and the lungs, often spread out as an epidemic, which quickly spreads from town to town and country to country, it affects lots of people in a short period of time. It´s most common symptoms are: headache, fever (38º to 40º), dry cough, vomiting or diarrhoea, fatigue and weakness, chest pains, nasal congestion and sore throat, irrigating and watering eyes, pneumonia... All this symptoms have to be recognized early to cure the infection. The droplets that are small enough for people to inhale are almost 5 µm in diameter and inhaling just one droplet might be enough to cause an infection. With a single sneeze it´s released up almost 40,000 droplets, most of these droplets are quite large, but they will quickly settle out of the air. Influenza spreads around the world in seasonal epidemics, resulting in three to five million yearly cases of severe illness, and about 250,000 to 500,000 yearly deaths. Where it´s most common is in the regions of South-America: Brazil, Venezuela, Argentina… and South- Asia: India,...


Bibliography: Oxford, ed. Science 3, ESO : Biology and Geology. [Madrid]: Oxford, 2008. Print. 978-84-673-7649-4.
"Influenza Virus Cure." Interview by Rafa (father). Influenza Virus Cure. Almeria, 4 Nov. 2012. Home.
"Influenza." Wikipedia. Wikimedia Foundation, 11 Mar. 2012. Web. 05 Nov. 2012. .
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