A Lymphatic virus is a type of virus that attacks the lymphatic system.

In 2152, Dr. Phlox detected a lymphatic virus aboard that he determined likely came aboard with the deuterium canisters from the Tessic's mining colony. Phlox recommended to acting-captain Tucker that he begin inoculating the entire crew, though it would cause side effects such as nausea and diarrhea. (ENT: "Marauders")