Final answer:
The statement is False. Influenza can cause epidemics, but it doesn't mean every city in the tristate region is affected.
Step-by-step explanation:
The statement that every city in the tristate region is currently suffering through the worst flu epidemic in twenty years is False. Influenza can cause epidemics, which are diseases that occur in a larger than expected number of cases in a short time within a geographic region. However, this does not mean that every city in the tristate region is affected. Epidemics can occur in specific regions or areas, but not necessarily throughout an entire region or country.