Influenza is on the rise across the country, according to a new Centers for Disease Control and Prevention report.
Haven't gotten the flu shot yet? This map should give you a good reason:

The number of states reporting widespread flu activity jumped from 12 to 23, the proportion of samples testing positive for influenza at clinical laboratories went from 8.4% to 14.0%, and the percentage of people seeking outpatient care for influenza-like illness (ILI) increased from 2.7% to 3.5% over last week’s report, according to the CDC.
The CDC says that the best bet for fighting the flu is to get a flu shot. Check with your physician or your county health department.
According to the CDC's definition, influenza (also known as the flu) is a contagious respiratory illness caused by flu viruses. It can cause mild to severe illness, and at times can lead to death. The flu is different from a cold. The flu usually comes on suddenly. People who have the flu often feel some or all of these symptoms:
- Fever* or feeling feverish/chills
 - Cough
 - Sore throat
 - Runny or stuffy nose
 - Muscle or body aches
 - Headaches
 - Fatigue (tiredness)
 - Some people may have vomiting and diarrhea, though this is more common in children than adults.
* It’s important to note that not everyone with flu will have a fever. 
Widespread influenza activity was reported by 23 states:
- Alabama
 - Arizona
 - Arkansas
 - California
 - Connecticut
 - Idaho
 - Illinois
 - Indiana
 - Kentucky
 - Louisiana
 - Maryland
 - Massachusetts
 - Mississippi
 - Missouri
 - New York
 - North Dakota
 - Ohio
 - Oklahoma
 - Oregon
 - South Carolina
 - Texas
 - Virginia
 - Wisconsin
 
Regional influenza activity was reported by Puerto Rico and 23 states:
- Alaska
 - Colorado
 - Florida
 - Georgia
 - Iowa
 - Kansas
 - Maine
 - Michigan
 - Minnesota
 - Montana
 - Nebraska
 - Nevada
 - New Hampshire
 - New Jersey
 - New Mexico
 - North Carolina
 - Pennsylvania
 - Rhode Island
 - South Dakota
 - Tennessee
 - Vermont
 - Washington
 - Wyoming
 
Local influenza activity was reported by the District of Columbia and four states:
- Delaware
 - Hawaii
 - Utah
 - West Virginia
 
Sporadic activity was reported by the U.S. Virgin Islands. Guam did not report. Geographic spread data show how many areas within a state or territory are seeing flu activity.