But the body's natural defenses are usually strong enough to prevent an active case.

VOA: special.2009.03.25

So, there's been an active effort to reestablish the process of smallpox vaccination in case that's needed.

为了以防万一,现在正积极重建,能够制造天花疫苗的工艺进程

耶鲁公开课 - 生物医学工程探索课程节选

The United States Embassy said it was an active case that is before justice officials and members of the judiciary, but was not willing to comment further.

BBC: David McIntyre

So we're really trying to get out there and do active case finding, which means that we're trying to get kids before they become severely malnourished to come in and get, you know, their adequate treatment and refer them to the proper places.

NPR: Doctor Describes Scene in Darfur

Since then, the firm has been among the most active in the case, winning a court order Nov. 2 freezing Bennett's assets.

FORBES: Legal Smackdown