Don't get too excited. We don't know the full story on the 2% that lived. For all we know, they could become tomorrow's 20% that developed pesticide resistance and rampaged through China's countryside.
From wikipedia.
Could end up being the same issue here, so this could easily become a FAR FAR worse issue in the next generation or two of these worms.
The lab helped inform the city's strategy for fighting mosquitos, which was to rotate pesticides. I believe they also bred and released neutered mosquitos.