Am I able to do this for loop in my code to pull out different values?

For my code I am trying to keep track of infection levels for different cities for a homework assignment. When I add one to these values for some reason they don't workout when I run it through this for loop. I am wondering how I could fix this code to make it work and run better. Here is my main for loop that runs the main part I am trying to fix.

public static void checkInf() {
        for (int i = 0; i < citiesInfected.length(); i++) {
            if(citiesInfected.getValue(i).getInfectionLevel() == 1){
            citiesInfected.remove(i);
                City newPop = citiesInfected.getValue(i);
                int popRounded = (int) (newPop.getPopulation() * .9);
                int realPopRound = popRounded + 1;
                newPop.setPopulation(realPopRound);
                citiesInfected.add(citiesInfected.getValue(i));
            }
            else if (citiesInfected.getValue(i).getInfectionLevel() == 2) {
                citiesInfected.remove(i);
                City newPop = citiesInfected.getValue(i);
                int popRounded = (int) (newPop.getPopulation() * .8);
                int realPopRounded = popRounded +1;
                newPop.setPopulation(realPopRounded);
                citiesInfected.add(citiesInfected.getValue(i));

            }
            else if (citiesInfected.getValue(i).getInfectionLevel() == 3) {
                citiesInfected.remove(i);
                City newPop = citiesInfected.getValue(i);
                int popRounded = (int) (newPop.getPopulation() * .75);
                int realPopRound = popRounded + 1;
                String newName = "New " + citiesInfected.getValue(i).getCityName();
                newPop.setPopulation(realPopRound);
                int pop = (int) (citiesInfected.getValue(i).getPopulation() * .75);
                int populationRounded = pop + 1;
                int newInfectionLevel = 0;
                City newCity = new City(newName, populationRounded, newInfectionLevel);
                citiesInfected.add(newCity);

                citiesInfected.add(citiesInfected.getValue(i));
                System.out.println(newCity.getCityName() + " has been made.");
            }
            else if (citiesInfected.getValue(i).getInfectionLevel() == 4) {
                citiesQuarantined.add(citiesInfected.getValue(i));
                System.out.println(citiesInfected.getValue(i).getCityName() + " has been placed in 
quarantine!");
            }
            else return;
        }
    }

I am giving it these inputs for the cities the last numbers being the infection levels.

b,2310,2
r,1967,1
e,3167,2
n,781,0
d,6706,0
a,2902,2
nn,8234,3

When I add one to all of those last numbers I want each of the numbers to do a different action(the actions being the ones in the for loop). Basically I am just confused if my for loop is messed up which is why I am getting the wrong input, or if it is something different. I really hope this makes sense. Here is also the output of my code.

The infection level for all cities has been increased.
New r has been made.
New n has been made.
nn has been placed in quarantine!

I want it to say:

New b has been made.
New e has been made.
New a has been made. 

Because all of these are at infection level 2