The World Health Organization says SARS is far more deadly than first thought, with a higher mortality rate than the flu or common cold. As SARS claims more victims, the health body has issued travel warnings to three new places -- Taiwan's capital of Taipei and China's Tianjin municipality and Inner Mongolia. Meanwhile, Russia is reportedly taking new steps to protect itself against SARS, with the government ordering the closure of some border checkpoints with China. According to the WHO, the overall death rate from SARS is 15 percent, almost four times higher than the original estimate of four percent. The rate fluctuates depending on country and age, with the U.N. health agency saying SARS is particularly dangerous for the elderly.

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