Can mutant mosquitoes fight Zika & dengue fever?

As mosquito-borne diseases such as dengue fever and Zika virus continue to ravage Brazil, scientists are racing to fight back. Their latest tactic: genetically engineered mosquitoes that will pass along fatal mutations to their offspring, destroying mosquito populations from within. But some researchers worry our limited knowledge of Zika could throw a wrench into this plan. Miles O’Brien reports.