Antimatter radiation is an energy form which can be extremely hazardous to humanoid life. A byproduct of antimatter, prolonged exposure to this radiation can cause serious degenerative health effects and, in high enough concentrations, can even disintegrate organic tissue. (VOY: "Revulsion", "Friendship One") In 2375, The Doctor asked Harry Kim if he had come into contact with antimatter radiation as a possible explanation for why Kim's skin was glowing. (VOY: "The Disease")