Rather than an e-mail virus warning, a new program offers e-mails warning of viruses -- and other types of sexually transmitted diseases.

After a successful effort in San Francisco, health officials in Los Angeles launched inSpotLA.org to give people a way to anonymously tell partners they may have been exposed to sexually transmitted diseases such as gonorrhea, chlamydia or HIV.

People diagnosed with such diseases can go to the Web site, fill out a warning card and send it off to their sexual partners anonymously. If the sender chooses, he or she can also sign the e-mail.