text: With the flu spreading around the world, the virus has turned up in birds in Asia and Europe, and it is feared that migrating flocks could take it to the Middle East and Africa. So far, the bird flu has only been passed from birds, either to other birds or in the isolated cases, to humans. However, if the flu mutates into a strain that can pass from human to human, people will have no immunity and the flu will probably pass rapidly from person to person, creating a pandemic. Flu vaccines can only be made to protect against a particular virus, and, since the virus has yet to be passed from human to human, no vaccine can be developed.\n\nIn Asia, many people live with ducks and chickens in their homes, and in their yards. Health and veterinary officials worldwide recently announced that a key way to stop the spread of the disease is to improve farming practices, segregating poultry from humans, and culling birds that have been infected with the deadly virus.\n\nWhat's next? When asked for predictions as to the seriousness of the pandemic, should one occur, experts have based their projections on a similar pandemic that occurred in 1918-1919. Up to a billion people fell ill, and nearly 100 million died worldwide. Translating to today's figures, they project that some 30-60 percent of the world's population could be infected by the virus, and over 300 million people worldwide could die. In the meantime, good hygiene remains the best prevention: keep hands well-washed, and avoid contact with people who have been infected with the virus.