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Contact: Florida Health


Season: 2019-20 Week 48: 11/24/19-11/30/2019

 Geographic Spread:

 Predominate Strain:
B Victoria lineage

 ILI Activity Trend:

Influenza & influenza-like illness (ILI) activity summary:

In week 48, activity increased and remained above levels observed at this time in previous seasons. ILI activity levels in week 48 were above those observed at the peaks of recent milder seasons on record.

Influenza and ILI activity remained particularly elevated in children for this time in the season.

Increased influenza activity is expected for several more months. In past seasons, peak activity was most often observed in February, but timing of peak activity can vary significantly from season to season.

Get your flu shot now; it’s not too late! Annual vaccination is the best way to protect yourself and your loved ones from influenza and its potentially severe complications. Children, especially those aged two years and younger and those with certain underlying medical conditions, are at higher risk for severe complications from influenza infection. Vaccination has been shown to reduce a child’s likelihood of dying from influenza by 60%.

Influenza vaccines are designed to protect against the three or four strains experts believe will be most common during the season.

Consistent with the national trend, influenza B Victoria lineage remains the most common subtype identified at the Bureau of Public Health Laboratories so far this season. An influenza B Victoria lineage strain is included in the 2019-20 quadrivalent and trivalent vaccine options.

In week 48, seven outbreaks were reported, down from 16 outbreaks reported during the previous week. Of the seven outbreaks reported, four were influenza-associated and three were ILI. Most outbreaks continue to be reported in facilities serving children (schools and child daycares).

Most county health departments reported mild activity.

The Centers for Disease Control and Prevention recommends antiviral treatment be initiated as soon as possible for people with confirmed or suspected influenza who are at higher risk for complications (children <2 years, adults ≥65 years, pregnant women, and people with underlying medical conditions). Treatment should be administered within 48 hours of illness onset. For more information, contact your health care provider.

Your flu shot is the first and most important step to fight the flu.To locate a vaccine near you, visit:

Influenza or ILI Outbreaks
Reported as of 11/30/19

A map showing Counties with outbreak(s) reported in week 48: Miami-Dade, Lake, Putnam. Counties with 0 outbreaks this season: Alachua, Baker, Bay, Bradford, Calhoun, Charlotte, Citrus, Clay, Columbia, DeSoto, Dixie, Duval, Franklin, Gadsden, Gilchrist, Glades, Gulf, Hamilton, Hardee, Hernando, Highlands, Holmes, Indian River, Jackson, Jefferson, Lafayette, Leon, Levy, Liberty, Madison, Marion, Monroe, Nassau, Okeechobee, Osceola, Polk, Sarasota, Sumter, Suwannee, Taylor, Union, Walton, Washington. Counties with 1-2 outbreaks this season: Brevard, Flagler, Hendry, Lee, Manatee, Martin, Orange, Pasco, St. Johns, Volusia, Putnam, Okaloosa, Santa Rosa, Seminole, St. Lucie, Wakulla. Counties with 3-4 outbreaks this season: Broward, Palm Beach. Counties with 5+ outbreaks this season: Pinellas, Escambia, Lake, Collier, Miami-Dade, Hillsborough.

County Influenza Activity

A map showing that there was No Activity: Gulf, Hamilton, Lafayette, Madison, Manatee, Okeechobee, Washington. Mild Activity: Alachua, Baker, Bay, Bradford, Broward, Calhoun, Charlotte, Citrus, Clay, Columbia, Miami-Dade, DeSoto, Dixie, Duval, Escambia, Flagler, Franklin, Gadsden, Gilchrist, Glades, Hardee, Hendry, Hernando, Highlands, Hillsborough, Holmes, Indian River, Jackson, Jefferson, Lake, Levy, Liberty, Marion, Martin, Monroe, Nassau, Okaloosa, Orange, Osceola, Palm Beach, Pasco, Pinellas, Polk, Santa Rosa, Sarasota, Seminole, St. Johns, St. Lucie, Sumter, Suwannee, Taylor, Union, Volusia, Wakulla, Walton. Moderate Activity: Brevard, Collier, Lee, Leon. Elevated Activity: Putnam. Unknown: None.

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