Influenza
hideInfluenza, commonly referred to as the flu, is an infectious disease caused by RNA viruses of the family Orthomyxoviridae (the influenza viruses), that affects birds and mammals. The name influenza comes from the Italian influenza, meaning "influence" (Latin: influentia). The most common symptoms of the disease are chills, fever, sore throat, muscle pains, severe headache, coughing, weakness and general discomfort. Fever and coughs are the most frequent symptoms. In more serious cases, influenza causes pneumonia, which can be fatal, particularly for the young and the elderly. Although it is often confused with other influenza-like illnesses, especially the common cold, influenza is a much more severe disease than the common cold and is caused by a different type of virus. Influenza may produce nausea and vomiting, particularly in children, but these symptoms are more common in the unrelated gastroenteritis, which is sometimes called "stomach flu" or "24-hour flu".
Typically, influenza is transmitted through the air by coughs or sneezes, creating aerosols containing the virus. Influenza can also be transmitted by bird droppings, saliva, nasal secretions, feces and blood. Infection can also occur through contact with these body fluids or through contact with contaminated surfaces. Airborne aerosols have been thought to cause most infections, although which means of transmission is most important is not absolutely clear. Influenza viruses can be inactivated by sunlight, disinfectants and detergents. As the virus can be inactivated by soap, frequent hand washing reduces the risk of infection.
Influenza spreads around the world in seasonal epidemics, resulting in the deaths of hundreds of thousands annually — millions in pandemic years. Three influenza pandemics occurred in the 20th century and killed tens of millions of people, with each of these pandemics being caused by the appearance of a new strain of the virus in humans. Often, these new strains appear when an existing flu virus spreads to humans from other animal species, or when an existing human strain picks up new genes from a virus that usually infects birds or pigs. An avian strain named H5N1 raised the concern of a new influenza pandemic, after it emerged in Asia in the 1990s, but it has not evolved to a form that spreads easily between people. In April 2009 a novel flu strain evolved that combined genes from human, pig, and bird flu, initially dubbed "swine flu", emerged in Mexico, the United States, and several other nations. WHO officially declared the outbreak to be a "pandemic" on June 11, 2009.
Vaccinations against influenza are usually given to people in developed countries and to farmed poultry. The most common human vaccine is the trivalent influenza vaccine (TIV) that contains purified and inactivated material from three viral strains. Typically, this vaccine includes material from two influenza A virus subtypes and one influenza B virus strain. The TIV carries no risk of transmitting the disease, and it has very low reactivity. A vaccine formulated for one year may be ineffective in the following year, since the influenza virus evolves rapidly, and new strains quickly replace the older ones. Antiviral drugs can be used to treat influenza, with neuraminidase inhibitors being particularly effective.
For more information about Influenza, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with influenza
Study links real-time data to flu vaccine strategies
15 hours ago |
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Adaptive vaccination strategies, based on age patterns of hospitalizations and deaths monitored in real-time during the early stages of a pandemic, outperform seasonal influenza vaccination allocation strategies, according ...
Vaccination, antivirals and social distancing may blunt impact of H1N1 influenza
17 hours ago |
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The relatively low number of new cases created by a single case of H1N1 influenza indicates that mitigation strategies such as vaccination, social distancing and the use of antiviral drugs may help to lessen the final impact ...
Knockouts in human cells point to pathogenic targets
Nov 26, 2009 |
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(PhysOrg.com) -- Whitehead researchers have developed a new approach for genetics in human cells and used this technique to identify specific genes and proteins required for pathogens.
China reports 8 cases of mutated swine flu virus
Nov 25, 2009 |
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(AP) -- China has detected eight people infected with mutated forms of the swine flu virus, a health official said Wednesday, but flu drugs and vaccines still work against it.
Trying last-ditch lung bypass for worst swine flu
Nov 23, 2009 |
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(AP) -- A technology originally developed for premature babies may be helping to save some of the sickest swine flu patients by rerouting their blood so their lungs can rest.
Researcher produces, ships only H1N1 vaccine available for swine
Nov 23, 2009 |
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The only swine vaccine available for the H1N1 virus has been sent to vaccinate a swine herd infected with the virus. The vaccination marks the first time vaccine has been sent to a swine herd diagnosed with the pandemic flu.
Mutation found in swine flu virus: WHO
Nov 20, 2009 |
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The World Health Organisation said Friday that a mutation had been found in samples of the swine flu virus taken following the first two deaths from the pandemic in Norway.
Preventing H1N1 spread to health care workers: Dilemma, debate and confusion
Nov 19, 2009 |
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A commentary in the December issue of The Lancet Infectious Diseases brings to light the gaps in knowledge on the transmission of a common pathogen - the influenza virus - and its impact on decisions about how best to pro ...
Asthma a significant risk factor for complications in children with H1N1
Nov 19, 2009 |
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A new study on pediatric H1N1 influenza admissions has found that asthma is a significant risk factor for severe disease in children with pandemic H1N1 compared with the seasonal flu. The study, led by researchers from The ...
Scientists find previous seasonal flu infections may provide some level of H1N1 immunity
Nov 16, 2009 |
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Researchers at the La Jolla Institute for Allergy & Immunology have found that previous influenza infections may provide at least some level of immunity to the H1N1 "swine" flu.
Scientists put interactive flu tracking at public's fingertips
Nov 16, 2009 |
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New methods of studying avian influenza strains and visually mapping their movement around the world will help scientists more quickly learn the behavior of the pandemic H1N1 flu virus, Ohio State University ...
Good hygiene goes a long way toward keeping pets, people healthy
Nov 13, 2009 |
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(PhysOrg.com) -- People may not be the only ones susceptible to the H1N1 virus this year - family pets also can fall victim to the influenza.
Mechanical ventilation for patients with lung damage don't always work as planned
Nov 12, 2009 |
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As more Canadians are diagnosed with H1N1 influenza infection, some will be admitted to hospital. The most severely affected may be treated in the intensive care unit (ICU) and placed on a mechanical ventilator to help them ...
Researchers mobilizing global resources to test new treatments for severe H1N1 infection
Nov 11, 2009 |
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An important, ground-breaking initiative is unfolding in the global critical care community in response to the H1N1 pandemic.
Google launches online flu shot finder
Nov 11, 2009 |
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Google on Tuesday launched an online tool for tracking down where to get vaccinations against H1N1 and seasonal influenza in the United States.
