Antiviral serum was a serum developed by Dr. Danara Pel as an antivirus for deadly insect bites on New Earth, a planet in the Delta Quadrant.

In 2372, Pel arranged to beam the serum to the USS Voyager as a way to cure Captain Kathryn Janeway and Commander Chakotay of their infection, after they were left behind by Voyager on New Earth. However, the Vidiians decided to attack Voyager and harvest the crew's organs. However, due to a plan by Acting Captain Tuvok, Voyager managed to escape from the Vidiians and deliver the serum to Chakotay and Janeway. (VOY: "Resolutions")

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