So new approaches beyond vaccines are needed that can address a wide range of possible agents.

Common practice is to avoid the agent if possible in individuals with decreased lung function.

"We've been working ever since 9/11 with federal law enforcement and health agencies to identify possible agents that might be used in the future."

Generally, the law requires your agent to make the same medical decisions that you would have made, if possible.

The thought of screening DS9's population for possible agents had not been a pleasant one.

He puts down his bumper crop of possible agents to several things.

It has been proposed as a possible chemotherapeutic agent in the treatment of brain cancer.

What we're looking for are possible agents who said no to him and got eliminated.

And we are not interested in identifying every possible agent involved.

Now, it seems to me there are two possible such agents, and that we have little choice but to approach at least one of them.