noun
prophylaxis
proh-fuh-LAK-sis/ˌprəʊfəˈlæksɪs/
Treatment or care to prevent disease or infection.
The secured mosquito net provides prophylaxis against insect-borne disease.

Etymology
The combination of “before” and “guard” presents prevention as standing watch before disease attacks. The noun names the preventive treatment or measures that perform this protective role.
In context
we have what's called pre-exposure prophylaxis you can give high-risk people so they don't get infected
More examples
- Dental prophylaxis includes cleaning teeth to help prevent gum disease.
- Antibiotic prophylaxis reduces the risk of infection after surgery.
- Travelers to some regions need malaria prophylaxis.
Forms
prophylaxis · prophylaxes
prophylactic adjective — Intended to prevent disease or infection.
Similar words
- prevention
- Broader term for stopping disease or other unwanted events.