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Since 2003 poultry and other birds have been continuously affected by the bird flu virus. Humans also got affected and it seems that since 16 January 2007, 267 cases of human bird flu infection were registered. These patients got into close contact with infected birds and that is why they got infected too. 161 persons from the group of 267 did not survive the contamination. Until now scientists declared that the virus is still unable to transmit from human to human, but the population is still concerned about the avian flu as there is a possibility for the virus to mix with a human flu virus and then pass from human to human. All viruses have the possibility to mutate or mix with other viruses and transform in to more dangerous ones. In case this thing happens a global pandemic can occur and millions of people will die if researchers do not fid an effective vaccine soon. Until now governments have instituted flu immunization programs to protect those who work with poultry and can contact the virus if the poultry is affected. This vaccination program is voluntary but until now all the personnel from the poultry industry has presented for a shot. This vaccine is protecting humans from catching the flu human type of virus and so it reduces the possibility for the bird flu virus to mix with a human virus and transform into a more dangerous one. This seasonal flu vaccination does not protect humans against the bird flu virus. As scientists tell us the bird flu is a disease which affects birds and is highly contagious among them. It is produced by the influenza A viruses. Birds can be mild affected by some viruses and so they develop only mild symptoms, but they can also be severe affected by other viruses which lead to their death. It seems that the bird flu virus is one of the most pathogenic strains of virus that can affect a bird. The virus is shed in feathers, droppings and secretions of birds and so it can easily spread to other birds and even humans through inhalation or ingestion. The most affected birds are the poultry. It seems that the wild birds like ducks and geese are the carriers of the virus but they do not have any symptoms of the illness. These birds are spreading the virus to the poultry which will develop the disease as they are more vulnerable to epidemics. The influenza A virus has many different subtypes. The H5 subtypes along with the H5N1 are considered to be quite dangerous and are a threat to humans. The H7 and H9 also caused severe infections in poultry but none of them was as dangerous as H5N1 is. The outbreak of H5N1 began in mid-December 2003 in poultry from South Korea and until now it has affected birds from Asia, Europe, Middle East and Africa. This virus resembles very much with the one that caused a lot of damage among poultry in 1997 in Hong Kong. The world governments have instituted controls in order to prevent illegal importation of dead poultry, of living birds or illegal entries of ill persons in certain countries. For more information about bird flu or even about asian bird flu please review this page http://www.bird-flu-info-center.com/asian-bird-flu.htm
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