Level 4 biosafety
Level 1 — This level applies to agents that do not ordinarily cause human disease.
Level 2 — This level is appropriate for agents that can cause human disease, but whose potential for transmission is limited.
Level 3 — This level applies to agents that may be transmitted by the respiratory route which can cause serious infection.
Level 4 — This level is used for the diagnosis of exotic agents that pose a high risk of life-threatening disease, which may be transmitted by the aerosol route and for which there is no vaccine or therapy.
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A member of an ancient caste of hereditary Jewish priests. Membership in the Levites is determined by paternal descent. The Levites have traditionally been considered the descendants of Levi, a son of Jacob. However, research has disclosed an unusual genetic signature called R1a1 on the Y chromosome in more than half of Levite males of […]
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Prefix meaning on the left side, as in levorotation (turning or twisting to the left). The opposition of levo- is dextro-.
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A progestin. Named levonorgestrel because it is the levorotatory form of norgestrel. Used in combination with an estrogen as an oral contraceptive. Used alone for emergency contraceptive (in Plan B) and the treatment of menstrual disorders or endometriosis.
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A synthetic thyroid hormone used as a thyroid hormone replacement drug (brand names include Levothroid, Levoxine, Levoxyl, Synthroid) used to treat an underactive thyroid gland (hypothyroidism).