HERD IMMUNITY . Concept used by epidemiologists, virologists, infectologists and other specialists to explain the phenomenon of immudity of a social group in that it achieves a critical mass of vaccinated and immunized. From a certain point, say 80% of vaccines no spread of contagion as the virus or bacteria does not find enough means to maintain the level of infected and the contagion disappears even if there is a rest of the group (herd) that does not have the Antibodies.
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