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Definition: Brechlyn nad yw’n cynnwys fersiwn fyw ar y feirws neu facteria y dymunir meithrin ymwrthedd iddo. Gall hyn gynnwys brechlynnau wedi’u hanactifadu (inactivated vaccines) yn ogystal â brechlynnau nad ydynt yn cynnwys unrhyw ran sylweddol o feirws neu facteria.
Notes: Cymharer â live attenuated vaccine / brechlyn gwanedig byw ac inactivated vaccine / brechlyn wedi’i anactifadu.
