Hyun adds,the North Korean leader also has to think about possible power succession, whether it happens right away or some time later- that is another reason to reinforce his power base.

VOA: standard.2009.06.22

The first step uses a bit of influenza DNA to get the patient's immune system to begin fighting off the flu, and then the protection is given a "boost" some time later by the second step, which can be either another bit of DNA or a conventional flu vaccine.

VOA: standard.2010.07.21

If trouble comes, it is better to let it come now than at some later time."

VOA: special.2009.07.23