The bird-flu virus, however, has infected
The bird-flu virus, however, has infected a large number of birds and animals, including ducks, chickens, turkeys, tree sparrows, peregrine falcons, great black-headed gulls, brown-headed gulls, gray herons, Canada geese, bar-headed geese, little egrets, pigs, clouded leopards, white tigers, mice, domestic cats, crows, magpies, peacocks, blue pheasants, rare eagles, turtledoves, swans, terns, and others. This is another sign of the virulence or destructiveness of the virus.
Researchers, historians, and infectious-disease experts have determined that influenza pandemics (global epidemics) occur approximately once every 30 years. The most deadly pandemic ever recorded occurred in 1918-19, killing more than 100 million people across the globe in less than two years. Two other much less severe pandemics occurred, one in 1957, when approximately two million people died, and one in 1968, when about one million people died.
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