One of the keys to spreading a computer virus is to find a way to get people to fall prey to the virus. Consequently, most computer viruses depend on social engineering/exploitation, as computer virus authors rely on porn, popular celebrities, cute kittens, offers of financial gain, and fear-mongering to get web surfers and e-mail recipients to click on dangerous web sites and file attachments. Here's a situation where fears about the swine flu are being exploited to spread a virus.
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Online "swine flu" infects cyberspace | MX Logic