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Prophylactic: A preventive measure. The word comes from the Greek for an advance guard, an apt term for a measure taken to fend off a disease or another unwanted consequence. A prophylactic is a medication or a treatment designed and used to prevent a disease from occurring.
Vaccines can be prophylactic (example: to prevent or ameliorate the effects of a future infection by a natural or wild pathogen), or therapeutic (e.g., vaccines against cancer are being investigated).