What is the most expensive virus in history?

The most pricey computer infection in history is the Love Bug infection, which was launched in 2000. Once a computer system was infected, the virus would delete essential files and spread itself to other computer systems.  https://zerogov.net/?p=821 The Love Bug infection was eventually stopped by a group of anti-virus researchers who created a vaccine that could protect computers from the infection. https://geogenes.org/?p=953