The suffering of a disease, however, does not appear all of a sudden. It actually takes time. And as in the medical field, for precaution's sake, the doctor injects a vaccination to prevent the growing of contamination, the practical injection to stop all the fructifications of the seeds of our sinful activities is simply engagement in Kṛṣṇa consciousness.
In this connection, Śukadeva Gosvāmī speaks in the Sixth Canto of Śrīmad-Bhāgavatam, Second Chapter, verse 17, about the story of Ajāmila, who began life as a fine and dutiful brāhmaṇa, but in his young manhood became wholly corrupted by a prostitute. At the end of his wicked life, just by calling the name "Nārāyaṇa (Kṛṣṇa)," he was saved despite so much sin.