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vaccination

(Encyclopedia)vaccination, means of producing immunity against pathogens, such as viruses and bacteria, by the introduction of an killed or weakened microorganism, a harmless piece of a microorganism, or the like t...

Henry VII, Holy Roman emperor and German king

(Encyclopedia)Henry VII, c.1275–1313, Holy Roman emperor (1312–13) and German king (1308–13). A minor count of the house of Luxembourg, Henry was elected German king on the death of King Albert I after the el...

Lee, Spike

(Encyclopedia)Lee, Spike (Shelton Jackson Lee), 1957–, African-American filmmaker, b. Atlanta, Ga. As a student at New York Univ., he won recognition with his gradu...

louse

(Encyclopedia)louse, common name for members of either of two distinct orders of wingless, parasitic, disease-carrying insects. Lice of both groups are small and flattened with short legs adapted for clinging to th...

bean

(Encyclopedia)bean, name applied to the seeds of leguminous trees and shrubs and to various leguminous plants of the family Leguminosae (pulse family) with edible seeds or seed pods (legumes). The genera and specie...

spurge

(Encyclopedia)CE5 Snow-on-the-mountain, Euphorbia marginata spurge spûrj [key], common name for members of the Euphorbiaceae, a family of herbs, shrubs, and trees of greatly varied structure and almost cosmopo...

hypersensitivity

(Encyclopedia)hypersensitivity, heightened response in a body tissue to an antigen or foreign substance. The body normally responds to an antigen by producing specific antibodies against it. The antibodies impart i...

Escherichia coli

(Encyclopedia)Escherichia coli ĕshˌərĭkˈēə kōˈlī [key], common bacterium that normally inhabits the intestinal tracts of humans and animals, but can cause infection in other parts of the body, especially ...

COVID-19

(Encyclopedia)COVID-19, contagious viral disease caused by severe acute respiratory syndrome coronavirus 2, or SARS-CoV-2, a coronavirus that is genetically related to SARS-CoV, which causes SARS. Symptoms generall...

Henry VI, Holy Roman emperor and German king

(Encyclopedia)Henry VI, 1165–97, Holy Roman emperor (1191–97) and German king (1190–97), son and successor of Holy Roman Emperor Frederick I (Frederick Barbarossa). He was crowned German king at Aachen in 116...