Here's where the flu is hitting hardest right now

DEERFIELD, Ill. — The latest Walgreens Flu Index shows that Puerto Rico and parts of Louisana are the top spots for flu activity so far this season.

The Walgreens Flu Index is a weekly report that provides state- and market-specific information regarding flu activity, and ranking of those experiencing the highest incidences of influenza across the country.

The Flu Index shows which populations are experiencing the most incidences of influenza each week based on Index methodology, the data does not measure actual levels or severity of flu activity.

The top metro areas for flu activity as of Dec. 18 are:

1. Puerto Rico

2. Lafayette, La.

3. Harlingen-Weslaco-Brownsville-McAllen, Texas

4. Columbus-Tupelo-West Point-Houston, Miss.

5. Beaumont-Port Arthur, Texas

6. Reno, Nev.

7. Greenville-Spartanburg, S.C.-Asheville, N.C.-Anderson, S.C.

8. Tri-Cities, Tenn.-Va.

9. Miami-Ft. Lauderdale, Fla.

10. Oklahoma City, Okla.

The top 10 states are:

1. Puerto Rico

2. Mississippi

3. Alabama

4. Nevada

5. Hawaii

6. Louisiana

7. Oklahoma

8. Texas

9. Wyoming

10. Tennessee