Final answer:
A decrease in both incidence and prevalence of flu cases would indicate to a community nurse that the flu season is ending, as there are fewer new and total cases.
Step-by-step explanation:
The statement that would indicate to a community nurse that the flu season is ending is a 'decrease in incidence and decrease in prevalence.' Incidence refers to the number of new cases of a disease, while prevalence refers to the total number of cases of the disease at a given time. A decrease in incidence indicates that fewer new cases are emerging, and a decrease in prevalence suggests that the total number of cases is also falling, which are both signs that the flu season is coming to an end.