The City

 The City: 

and the fourth zone after The Park area, in the zone there is a hospital, an airport, research, you will have to improve the bonuses to go faster and have more people in the zone

 Population Citizens: 

We can have up to 150,000 citizens max in area The City

 Hospital: 

He is there to treat people who were touched by the virus

 Research: 

And a research center that allows you to give in-game bonuses (Sneeze Rate, Sneeze Spread, Infection Points)

 Airport: 

It is an aircraft that deposits citizens in the city it can bring up to 85max, it will be necessary to improve its bonuses so that it is faster and to have more citizens in the aircraft