Immunity was the natural ability of an organism's immune system to fight off infections and diseases.

The children under the age of four of five of a group of Human colonists, later known as Novans, were able to build up an immunity against the radioactive debris of an asteroid. (ENT: "Terra Nova")

On the M-class planet Valakis, the Menk had a natural immunity against a plague the Valakians suffered from. (ENT: "Dear Doctor")

In 2152, Doctor Phlox used a medical scanner to confirm that the Takret anatomy was immune to radiolytic isotopes. (ENT: "The Catwalk")

T'Pol's Vulcan k-cells were immune and neutralized the mutagenic virus created by the Loque'eque. (ENT: "Extinction")

When Captain James T. Kirk was up to stop Charlie Evans, Doctor McCoy reminded him that he did not have any special immunity anymore. (TOS: "Charlie X")

Captain Ronald Tracey found that the atmosphere of the planet Omega IV provided him immunity to the Omega IV virus. (TOS: "The Omega Glory")

When Doctor McCoy treated Spock's choriocytosis with injections of a synthesized drug, the Vulcan body started to build up an immunity after two days. (TAS: "The Pirates of Orion")

Vulcans were among the species known to have a natural immunity against the Dramia II plague. (TAS: "Albatross")

The physicians at the Darwin Genetic Research Station on Gagarin IV engineered augmented Human children were designed to resist disease. (TNG: "Unnatural Selection")

When Doctor Beverly Crusher removed the proximity detector from Ishara Yar, she noted that her metabolism, immunity, all other vital signs were excellent. (TNG: "Legacy")

While Doctor Julian Bashir assisted in the destruction of the Harvesters, he noted that he had "never seen a nano-biogenic weapon so resistant to broad spectrum radiation." (DS9: "Armageddon Game")

Most Humans had a natural immunity against Urodelan flu, except Reginald Barclay. (TNG: "Genesis")

The Vidiians searched for centuries for a species immune to the phage until chief surgeon Sulan found the Klingon B'Elanna Torres in 2371. (VOY: "Faces")

The toxin the Nechani monks acquired before entering the biogenic field produced the natural immunity. (VOY: "Sacred Ground")

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