active prophylaxis

ac·tive pro·phy·lax·is

use of an antigenic (immunogenic) agent to stimulate the immunologic mechanism.
References in periodicals archive ?
If active prophylaxis is considered due to perceived further risk, a single dose of LMWH prior to departure or fitted below-knee graded compression stockings may be used.
Therefore, active prophylaxis cannot be generally recommended, and the need for it must be determined on a case-by-case basis.