ABSTRACT - Federal health officials warn consumers to be wary of advertisements on Internet for products claiming to prevent SARS; Food and Drug Administration Comr Mark B McClellen says risk of contracting disease in United States is 'very, very low,' and there is no evidence that any specific drug is effective against it; photos (M) Type ''SARS'' into an Internet search engine and advertisements from a variety of companies pop up offering products as diverse as health supplements, disinfectants and special protective suits that marketers say will keep the new disease, severe acute respiratory syndrome, at bay.

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