Born in 1550 in the kingdom of Naples, of the noble family of Lellis, St. Camillus entered the Capuchin Order, but twice he had to leave it on account of a sore on his leg. For God intended him to be the founder of a congregation of Regular Clerks, consecrating themselves to the service of the sick. He obtained from the Apostolic See approbation for his Order. Inspired by the example of Jesus who died for us (Epistle) and who has declared that there is no greater proof of love than to give one's life for others (Introit, Gospel), these religious promise to tend the sick, even those stricken with the plague. St. Camillus, as well as his Institute received from God a special grace to help souls to emerge victoriously from the death-struggle (Collect, Secret), wherefore the name of this saint has been included in the Litany for the Agonizing. St. Camillus died at Rome on July 14, 1614. Leo XIII proclaimed him the patron of hospitals and patients, and Pius XI of all those who nurse them.
Majorem hac dilectionem nemo habet, ut animam suam ponat quis pro amicis suis. * Beatus qui intelligit super egenum, et pauperem: in die mala liberabit eum Dominus.
Greater love than this no man hath, that a man lay down his life for his friends. * Blessed is he that understandeth concerning the needy and the poor: the Lord will deliver him in the evil day.
(St John 15:13 and Psalm 40:2 from the introit of Mass)
Deus, qui sanctum Camillum, ad animarum in extremo agone luctantium subsidium, singulari caritatis praerogativa decorasti: ejus, quaesumus, meritis spiritum nobis tuae dilectionis infunde; ut in hora exitus nostri hostem vincere, et ad caelestem mereamur coronam pervenire.
O God, who didst endow saint Camillus with a special grace of charity for the relief of souls in their last agony; we beseech Thee, by his merits to pour into our hearts the spirit of Thy love, that in the hour of our death we may overcome the enemy, and deserve to win a heavenly crown.
From the Catholic Encyclopaedia: http://www.newadvent.org/cathen/03217b.htm