Final answer:
To calculate the incidence for the month of May, subtract the number of cases on May 1st from the total cases on May 31st. Divide the number of new cases by the total population of Townsville and multiply by 100,000 to get the incidence per 100,000 residents.
Step-by-step explanation:
To calculate the incidence for the month of May, we need to find the number of new cases that occurred during that month. To do this, subtract the number of cases on May 1st from the total cases on May 31st. So, the number of new cases in May is 456 - 1 = 455.
Next, divide the number of new cases by the total population of Townsville and multiply by 100,000 to get the incidence per 100,000 residents. The incidence for the month of May is (455 / 45,890) * 100,000 = 991.44.