[delbel]

I'm not familiar with any details about this vaccine or other therapies, but from what I understand is when you have a partial solution or near total solution like this, you combined it with another therapy so you have two methods of action to dealt a "kill shot" to the target organism or virus. This combined therapy strategy is used in killing Borrelia type infections. Basically they combined two different antibiotics at the same time. Alone they are effective at relapse rate of say only 5% after 14 weeks, combined they can get near 1% or lower. Also when an organism evolves, its genetics can drift causing mutations that are disadvantageous. There a chance the mutation could make it more vulnerable to something just as well as immune to something else, and also there has to be consideration that there is a scenario where that can happen at the same time.

[cbhl]

The article says they already combined three different antibodies to get the 99% rate.