Doctor Phlox soon determines that they were infected by a mutagenic virus , and concludes that T'Pol's Vulcan genetics rendered her immune .
Archer and Sato flee and T'Pol opts to stay with them .
Doctor Phlox soon determines that they were infected by a mutagenic virus , and concludes that T'Pol's Vulcan genetics rendered T'Pol 's immune .
Archer and Sato flee and T'Pol opts to stay with them .