Avian influenza is an infection caused by avian (bird) influenza (flu) viruses. These influenza viruses occur naturally among birds. Wild birds worldwide carry the viruses in their intestines [url=http://www.jaguarsauthenticofficialshop.com/authentic-yannick-ngakoue-jersey.html]Yannick Ngakoue Jaguars Jersey[/url] , but usually do not get sick from them. However, avian influenza is very contagious among birds and can make some domesticated birds, including chickens, ducks, and turkeys [url=http://www.jaguarsauthenticofficialshop.com/authentic-myles-jack-jersey.html]Myles Jack Jaguars Jersey[/url] , very sick and kill them.

Infected birds shed influenza virus in their saliva, nasal secretions, and feces. Susceptible birds become infected when they have contact with contaminated secretions or excretions or with surfaces that are contaminated with secretions or excretions from infected birds. Domesticated birds may become infected with avian influenza virus through direct contact with infected waterfowl or other infected poultry, or through contact with surfaces (such as dirt or cages) or materials (such as water or feed) that have been contaminated with the virus.

Infection with avian influenza viruses in domestic poultry causes two main forms of disease that are distinguished by low and high extremes of virulence. The 鑺掗埀顑犳悋ow pathogenic鑺掗埀顑?form may go undetected and usually causes only mild symptoms (such as ruffled feathers and a drop in egg production). However, the highly pathogenic form spreads more rapidly through flocks of poultry. This form may cause disease that affects multiple internal organs and has a mortality rate that can reach 90-100% often within 48 hours.

Human infection with avian influenza viruses

There are many different subtypes of type A influenza viruses. These subtypes differ because of changes in certain proteins on the surface of the influenza A virus (hemagglutinin [HA] and neuraminidase [NA] proteins). There are 16 known HA subtypes and 9 known NA subtypes of influenza A viruses. Many different combinations of HA and NA proteins are possible. Each combination represents a different subtype. All known subtypes of influenza A viruses can be found in birds.

Usually [url=http://www.jaguarsauthenticofficialshop.com/authentic-dede-westbrook-jersey.html]Dede Westbrook Jaguars Jersey[/url] , 鑺掗埀顑犳彸vian influenza virus鑺掗埀顑?refers to influenza A viruses found chiefly in birds, but infections with these viruses can occur in humans. The risk from avian influenza is generally low to most people, because the viruses do not usually infect humans. However, confirmed cases of human infection from several subtypes of avian influenza infection have been reported since 1997. Most cases of avian influenza infection in humans have resulted from contact with infected poultry (e.g., domesticated chicken [url=http://www.jaguarsauthenticofficialshop.com/authentic-dawuane-smoot-jersey.html]Dawuane Smoot Jaguars Jersey[/url] , ducks, and turkeys) or surfaces contaminated with secretionexcretions from infected birds. The spread of avian influenza viruses from one ill person to another has been reported very rarely, and transmission has not been observed to continue beyond one person.

鑺掗埀顑犳弻uman influenza virus鑺掗埀顑?usually refers to those subtypes that spread widely among humans. There are only three known A subtypes of influenza viruses (H1N1, H1N2, and H3N2) currently circulating among humans. It is likely that some genetic parts of current human influenza A viruses came from birds originally. Influenza A viruses are constantly changing [url=http://www.jaguarsauthenticofficialshop.com/authentic-cam-robinson-jersey.html]Cam Robinson Jaguars Jersey[/url] , and they might adapt over time to infect and spread among humans.

During an outbreak of avian influenza among poultry, there is a possible risk to people who have contact with infected birds or surfaces that have been contaminated with secretions or excretions from infected birds.

Symptoms of avian influenza in humans have ranged from typical human influenza-like symptoms (e.g., fever, cough, sore throat [url=http://www.jaguarsauthenticofficialshop.com/authentic-leonard-fournette-jersey.html]Leonard Fournette Jaguars Jersey[/url] , and muscle aches) to eye infections, pneumonia, severe respiratory diseases (such as acute respiratory distress), and other severe and life-threatening complications. The symptoms of avian influenza may depend on which virus caused the infection.

Studies done in laboratories suggest that some of the prescription medicines approved in the United States for human influenza viruses should work in treating avian influenza infection in humans. However, influenza viruses can become resistant to these drugs [url=http://www.jaguarsauthenticofficialshop.com/authentic-dj-chark-jersey.html]DJ Chark Jaguars Jersey[/url] , so these medications may not always work. Additional studies are needed to demonstrate the effectiveness of these medicines.

Avian Influenza A (H5N1)

Influenza A (H5N1) virus 鑺掗埀顑解偓?also called 鑺掗埀顑犳弻5N1 virus鑺掗埀顑?鑺掗埀顑解偓?is an influenza A virus subtype that occurs mainly in birds, is highly contagious among birds, and can be deadly to them. H5N1 virus does not usually infect people, but infections with these viruses have occurred in humans. Most of these cases have resulted from people having direct or close contact with H5N1-infected poultry or H5N1-contaminated surfaces.

Human health risks during the H5N1 outbreak

Of the few avian influenza viruses that have crossed the species barrier to infect humans, H5N1 has caused the largest number of detected cases of severe disease and death in humans. In the current outbreaks in Asia and Europe more than half of those infected with the virus have died. Most cases have occurred in previously healthy children and young adults. However [url=http://www.jaguarsauthenticofficialshop.com/authentic-taven-bryan-jersey.html]Taven Bryan Jaguars Jersey[/url] , it is possible that the only cases currently being reported are those in the most severely ill people, and that the full range of illness caused by the H5N1 virus has not yet been defined. For the most current information about avian influenza and cumulative case numbers, see the World Health Organization (WHO) avian influenza website.

So far, the spread of H5N1 virus from person to person has been limited and has not continued beyond one person. Nonetheless, because all influenza viruses have the ability to change [url=http://www.jaguarsauthenticofficialshop.com/authentic-a-j-cann-jersey.html]A. J. Cann Youth Jersey[/url] , scientists are concerned that H5N1 virus one day could be able to infect humans and spread easily from one person to another. Because these viruses do not commonly infect humans, there is little or no immune protection against them in the humThe ultimate . [url=http://www.cheapnfljerseysfreeshipping.com/]Cheap Jerseys[/url]   [url=http://www.cheapnflauthenticjerseysshop.com/]Cheap Jerseys From China[/url]   [url=http://www.cheapnewjerseyschina.com/]Cheap Jerseys Free Shipping[/url]   [url=http://www.cheapjerseysnflfromchina.com/]Cheap NFL Jerseys From China[/url]   [url=http://www.cheapcustomnfljerseys.com/]Cheap NFL Jerseys Wholesale[/url]   [url=http://www.cheapauthenticsportsjerseys.com/]Cheap NFL Jerseys[/url]   [url=http://www.wholesalesportsjerseysonline.com/]Wholesale Jerseys China[/url]   [url=http://www.wholesalesportsjerseysfromchina.com/]Wholesale Throwback Jerseys[/url]   [url=http://www.wholesalejerseyssportsfreeshipping.com/]Wholesale Jerseys Free Shipping[/url]   [url=http://www.cheapsportssoccerjerseyschina.com/]Cheap Custom Soccer Jerseys[/url]