WEEKLY INFLUENZA SURVEILLANCE ACTIVITY 2019 2020 …

WEEKLY INFLUENZA SURVEILLANCE ACTIVITY

DOUGLAS COUNTY, NEBRASKA INFLUENZA SEASON 2019-2020

December 9, 2019

Key Points:

Douglas County is currently experiencing high levels of influenza activity. Influenza A(H1N1)pdm09 is the predominate circulating strain in Douglas County,

compared to influenza B/Victoria circulating in other regions of the country. Nebraska is one of 12 states experiencing high levels of influenza-like illness. Two outbreaks in long-term care (LTC) facilities have been reported. The number of RSV positive tests continues to remain high. According to the CDC, elevated influenza activity is expected to continue for weeks.

It's not too late to get vaccinated. Influenza vaccination is the best way to reduce the risk from flu and its potentially serious complications.

Douglas County: Flu activity continues to increase in Douglas County. The number of reported cases have increased over the last few weeks. Also, the current percentage of outpatient visits with influenza-like illness (ILI), percentage of emergency department visits with ILI, percentage of hospital admissions with ILI, and percent of children absent from school due to illness have all increased in recent weeks (Table 2).

As of December 7, 609 PCR-confirmed influenza tests (552 A and 57 B) and 457 positive rapid influenza diagnostic test (RIDT) results (409 A and 48 B) have been reported since September 29.

Two outbreaks in long-term care (LTC) facilities have been reported (CDC guidance for LTC: ). Douglas County Health Department has not received any reports of adult or pediatric deaths due to influenza this season. However, influenza-associated adult deaths are not reportable by law and may be underreported.

A total of 108 positive respiratory syncytial virus (RSV) tests were reported (of 476 tested) last week. For prophylaxis and high-risk infants and children, please consult the AAP policy statement: .

TABLE 1. LABORATORY-CONFIRMED INFLUENZA CASES1 Douglas County, Nebraska

INFLUENZA TYPE

Rapid ? A (Not sub-typed) PCR ? A PCR ? A (H1N1)

WEEK ENDING 12/07/2019

144 192 35

TIME PERIOD WEEK ENDING 11/30/2019

125 136 22

FLU SEASON2

409 462 89

PCR - A (H3) ? Seasonal

0

0

1

Rapid - B PCR - B Rapid A/B4 (Not typed)

28

8

48

25

15

57

0

0

0

TOTAL

424

306

1066

1Table reflects all reported positive influenza tests. When influenza activity is low in the community,

positive rapid influenza test results have a greater likelihood of being "false positive". 2Since September 29, 2019

Figure 1: Number of Positive Influenza Laboratory Reports in Douglas County Residents by Flu Type, 2019-20 Season Figure 2: Number and Percentage of Positive Influenza Laboratory Reports in Douglas County Residents by Age Group and Flu Type, Cumulative Total, 2019-20 Season

Figure 3: Number and Percentage of Hospital Admissions with Influenza Like Illness in Douglas County Residents by Age Group, Cumulative Total, 2019-20 Season

TABLE 2. INFLUENZA SURVEILLANCE STATS

SURVEILLANCE DESCRIPTION

% Percent of outpatient visits with influenza-like illness (ILI)1,2 % Percent of emergency department visits with ILI3 % Percent of hospitalizations with ILI2 # Number of hospitalizations on ventilators with ILI2 % Percent Pneumonia & Influenza Deaths (EDRS)2,4 # Number of Laboratory-confirmed influenza pediatric deaths2,5 % Percent of school absenteeism due to illness3 % Percent of RSV tests positive (positives/total tests)3

MOST RECENT WEEK

2.0% 7.8% 6.0%

15 9.2%

0 2.3% 22.7% (108/476)

PREVIOUS WEEK

2.2% 8.5% 5.1%

12 10.5%

0 H 21.2% (186/879)

1ILI: Influenza-like Illness is defined as a fever of 100? F as well as cough and/or sore throat. 2As of 11/30/2019 3As of 12/07/2019 4Nebraska Electronic Death Records 5Laboratory-confirmed or cause of death related to influenza -Data not available HHoliday, no school

Figure 4: Percent of Influenza Surveillance Indicator by MMWR Week Ending and Indicator Type, 2019-20 Season

*Influenza-Like-Illness (ILI) is defined as a fever of >= 100 degrees Fahrenheit as well as cough and/or sore throat.

MONTH

October November December January February March April May June July August September Total

20192020

N

24 618 424

-

1066

TABLE 3. REPORTED INFLUENZA CASES BY FLU SEASON AND MONTH Douglas County, Nebraska

FLU SEASON

20182019

N

2017- 2016-

2018 2017

N

N

20152016

N

20142015

N

20132014

N

20122013

N

20112012

N

20102011

N

8

30

3

33

23

3

9

0

1

12 127

14

14

44

44

19

2

5

826 606 113

63 847 291 385

32

7

1649 1917 955 126 1035 423 1167

64 111

986 2012 1593 335 603 238 449

99 269

325 1078 780 750 742 152

74 117 185

63 227 183 505 228 147

12

19

20

25

29

26

94

33

35

1

2

1

3

2

3

18

6

4

0

1

0

8

2

6

4

1

1

0

0

0

3

0

2

4

1

1

0

1

0

3

2

4

4

5

1

0

0

0

3911 6032 3682 1950 3568 1340 2116 337 599

20092010

N

570 171

19 2 5 6 4 1 1 0 1 0

780

Total (ALL)

N

704 1070 3613 7449 6589 4209 1408

247 38 22 13 19

25381

Links to local graphs, and state and national reports:

Graphs of Current Flu Activity Surveillance (Douglas County, NE)

Nebraska Weekly Surveillance Activity

U.S. Weekly Surveillance Activity

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