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attenuation
(english) (1) The reduction in sound or light intensity caused by the absorption and scattering of sound or light energy in air or water. (2) Any procedure in which the virulence of a given (live) pathogen for a particular host species is reduced or abolished without altering its immuno-genicity; attenuation may be achieved by serial passage and may be used to prepare vaccines. (3) A reduction in the virulence of a pathogen under natural conditions. (See also: acoustics, attenuated, attenuated vaccine)
atténuation
(french) La réduction de son ou d’intensité de la lumière due à l'absorption et éparpillement de son ou d’énergie de la lumière dans l'air ou dans l'eau. (See also: acoustics, attenuated, attenuated vaccine)
atenuação
(portuguese) Redução da intensidade do som ou da luz devida à absorção ou refracção da energia sonora ou luminosa pelo ar ou pela água. (See also: acoustics, attenuated, attenuated vaccine)

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