This could be one of the reasons why they want to test everybody. It appears they are looking for a gen VMAT2. In accordance to some crazy scientist, people who are not zombies but more awake or spritual have this gen as well as the religious extremers. So if you are not a zomby you are a religious extremer in accordance to these people. They also bring the solution to the problem, a vaccine in order to make you a zomby.
The interesting part is in english language on minute 6 and later on minute 12.