There is anecdotal evidence of laymen being allowed to bring communion to the sick during extraordinary circuмstances prior to Vatican II.

Tarcisius was a boy of third-century Rome. His virtue and devotion were so strong that the clergy trusted him to bring the Blessed Sacrament to the sick. Once, while carrying a pyx, he was recognized and set upon by a pagan mob. They flung themselves upon him, trying to pry the pyx from his hands. They wanted more than anything to profane the Sacrament. Tarcisius’ biographer, the fourth-century Pope Damasus, compared them to a pack of rabid dogs. Tarcisius “preferred to give up his life rather than yield up the Body of Christ.” Even at such an early age, Tarcisius was aware of the stakes. Jesus had died for love of Tarcisius. Tarcisius did not hesitate to die for love of Jesus.