The Food and Drug Administration says it has found at least 20 Web sites that may be fraudulently marketing products with claims they guard against or cure swine flu.
The FDA Monday publicly rebuked one such site, rebuildermedical.com, for offering a $199 ``SilverCure Swine Flu Protection Pack'' consisting of shampoo, lotion, conditioner and soap that supposedly deposit traces of silver.
The FDA says no silver-based products have been approved for swine flu treatment or prevention.
Alyson Saben, who heads a new FDA swine flu consumer fraud team,
says Rebuildermedical will have 48 hours to take corrective action.
A phone message and e-mail to Rebuildermedical were not immediately returned.
Meantime, the Better Business Bureau says an online security company found more than 250 web sites with the term "swine flu" were registered in the first few days following the virus' appearance. One is selling a "Swine Flu Survival Guide" for $19.95.
The BBB advises people to not open email from an unknown source and to not click on any links or open any attachments. They suggest deleting the email or forwarding it to the Federal Trade Commission at email@example.com.
They also remind people to not fall for offers of a swine flu vaccine, because one does not currently exist.
The Associated Press contributed to this report.