Health officials also hope to have 26 million courses of the antivirals Tamiflu and Relenza by year's end, and 81 million courses -- enough to treat more than 25 percent of the U.S. population -- by the end of 2008. Antivirals lessen the effects of the flu. Viruses eventually can develop resistance to widely used antivirals, and that's already occurred in isolated instances with Tamiflu.
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