Are Mosquitoes Being Eradicated Or Merely on Vacation?

A research reported in Malaria Journal indicates that malaria-carrying mosquitoes are on their last legs in some parts of Africa, but the scientists were not sure as to why.

Figures presented showed that controls such as anti-mosquito bed nets treated with insecticide are having a significant blow on the incidence of malaria in some sub-Saharan countries. But the data also showed that mosquitoes are disappearing from areas with even less controls.

The question is whether the mosquitoes are being eradicated or merely on vacation? The later is a scary scenario because if that were the case, we should expect them to return with renewed vitality.