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Fighting BackWhat Happens The enemy in its war is a nasty little virus—a mumps virus. That virus quickly finds and enters a healthy cell within the body, where it uses that cell's machinery to make many copies of itself. Continue Search for a Vaccine | See HIV in Action | AIDS in Perspective The Virus Fighters | Fighting Back | Help/Resources Teacher's Guide | Transcript | Site Map | Surviving AIDS Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated October 2000 |