A state-by-state breakdown shows most politically split areas in the country–and where campaigners could therefore target.

The U.S. is in peak flu season, as the Centers for Disease Control (CDC) says "seasonal influenza activity remains elevated and continues to increase across the country." Case counts vary by state, ...

(NEXSTAR) – The map of flu activity across the United States continues to darken, both figuratively and literally, as case numbers spike upward in most states, according to the Centers for Disease ...