The government should really isolate the people as fast as they can so the infectious disease won't affect other people. And yes the army should get involved because what happens if there's someone else that carries infectious disease that they don't know about. With the army's help then there will be a better chance on decreasing the infectious disease people. So it will be best if the government isolate the people with infectious disease as fast as they possibly can so people won't spread the disease and won't get constantly infected with the disease. If they don't isolate the people fast who knows what might happen in other places and life.
