Nebraska Influenza Surveillance Report 2019 20 Influenza ...

Nebraska Influenza Surveillance Report 2019-20 Influenza Season, Week 52

(All data are preliminary and may change as more reports are received.)

January 3, 2020

Synopsis for Week Ending December 28th, 2019

The Nebraska influenza surveillance system is a collaborative effort between DHHS and its many partners in the state including, local health departments, public health and clinical laboratories, vital statistics offices, healthcare providers, clinics and emergency departments. Indicators from Nebraska's influenza surveillance systems (laboratory testing, sentinel provider visits, influenza hospitalizations, emergency department visits, and school absences due to illness) showed that influenza activity increased sharply again this past surveillance week. NE continues to report "WIDESPREAD" activity level to the CDC's weekly influenza geographic spread estimates surveillance. This surveillance indicates geographic spread and does not measure the severity of influenza activity.

SUMMARY STATS

Percent of influenza tests positive

36.87% (1893/5134)

Percent of RSV rapid tests positive

22.96% (347/1511)

Percent of outpatient visits for ILI1

4.04% (state baseline 2.05%)

Influenza-associated hospitalizations2

629 inpatients (3,998 cumulative)

Percent of emergency department visits

due to ILI3

10.97%

Percent school absence due to illness4 School not in session

Number of schools with 11% absence due

to illness

School not in session

Number of influenza and other respiratory disease outbreaks reported (Cumulative) 14

Influenza-associated mortality-all ages

(Cumulative)5

5

1 ILI: Influenza-like Illness is defined as a fever of 100? F as well as cough and/or sore throat 2 Hospitalizations due to ILI are voluntarily reported through a weekly survey of Nebraska hospitals 3 Visits due to ILI are collected by syndromic surveillance received from Nebraska hospitals 4 Percent school absence due to illness are reported through a weekly survey of Nebraska schools 5 Deaths in which influenza is listed on the death certificate and lab confirmed. This is an underestimate of influenza-related deaths Cumulative is 9/29/2019-current week

National Summary: Please see

International Summary: Please see

Please visit the DHHS influenza webpage for more influenza information.

Page 1

Laboratory Surveillance

Voluntary submission of isolates by clinical virology laboratories to the Nebraska Public Health Laboratory (NPHL) for influenza surveillance.

Reporting by Nebraska laboratories of positive test results and total number of respiratory virus specimens tested.

Influenza Diagnostic Testing

This surveillance system counts influenza diagnostic tests performed and if they are positive or negative. When there is little influenza circulating in the community, specimens that test positive on a rapid antigen test have a greater likelihood of being "false positive" and require careful clinical correlation. As influenza circulates more widely in the population, specimens that test positive are more likely to be "true positive" and reflect actual influenza infection.

87 of 87 hospital laboratories reported data for the past week. Of the 5,134 influenza diagnostic tests reported, 1893 (36.87%) were positive (highest on record), with 22.77% (n=1,169) positive for influenza A and 14.1% (n=724) positive for influenza B. The total number of tests performed increased by 29% and the number of positive A influenza tests increased by 29% and the number of influenza B tests increased by 69%. Currently, influenza A 2009 H1N1 and influenza B are both circulating at high levels. Other respiratory infections, such as RSV, are also circulating across Nebraska at increased levels.

Influenza Diagnostic Test Surveillance 2019-2020

Season-to-Date (September 29, 2019-December 28, 2019) Totals

All Influenza

Influenza A

Influenza B

Total Positive Total Tests Performed % Positive

5956 26725 22.29%

percentage of flu positives

4318

1638

72.50%

27.50%

Surveillance Week Data (December 22-28, 2019)

All Influenza

Influenza A

Influenza B

Total Positive

1893

percentage of flu positives

Total Tests Performed

5134

1169

724

% Positive

36.87%

61.75%

38.25%

RSV

Total Positive Total Tests Performed % Positive

Season-to-Date

1832 10452 17.53%

Surveillance Week

347 1511 22.96%

Of the specimens that were able to be typed for influenza type A, there has been:

5 flu A H3N2

489 flu A 2009 H1N1

11 influenza B specimens were tested to determine lineage

2 B/Yamagata

12 B/Victoria

Page 2

Laboratory Surveillance

Year-to-Year Comparison

Positive Influenza Laboratory Tests by Nebraska

Laboratories

2000

2017-18 2018-19 2019-20

1800

1600 1400

Positive Influenza

1200

1000

800 600

400

200

0 40 41 42 43 44 45 46 47 48 49 50 51 52 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 MMWR Week

number positive tests number positive tests

Total Positive Influenza A Laboratory Tests

by Nebraska Laboratories

1,800

2017-18

2018-19

2019-20

1,600

1,400

1,200

1,000

800

600

400

200

0 40 42 44 46 48 50 52 2 4 6 8 10 12 14 16 18 20

MMWR Week

Total Positive Influenza B Laboratory Tests

by Nebraska Laboratories

1,000

2017-18

2018-19

2019-20

900

800

700

600

500

400

300

200

100

0 40 42 44 46 48 50 52 2 4 6 8 10 12 14 16 18 20

MMWR Week

Page 3

Outpatient Surveillance--ILINet

Voluntary reporting by a statewide network of sentinel clinicians of the number of patients presenting with influenza-like illness (ILI) and the total number of patient visits by age group each week.

Sentinel Provider Surveillance: 14 of the 17 sentinel-site physician offices in Nebraska which are designated to track ILI reported data for the surveillance week. Of 1,536 total patient visits reported, 62 (4.04%) met ILI criteria.

Percent Positive

Percentage of Visits for Influenza-like Illness (ILI) Reported by the Nebraska Outpatient Influenza-like Illness Surveillance Network (ILINet)

2015-2018

7

2017-18

6

2018-19

2019-20

5

State Baseline

4

3

2

1

0

MMWR Week

ILINet for week ending Dec. 28th, 2019

Age 0-4 Age 5-24 Age 25-49 Age 50-64 Age over 64 Total ILI Total patients

14

25

15

6

2

62

1536

0.91% 1.63% 0.98% 0.39%

0.13%

% ILI 4.04%

Number of Cases

Influenza-like Illness (ILI) Reported by the Nebraska Outpatient Influenza-like Illness Surveillance Network (ILINet), by age group, 2019-2020

45 40 35 30 25 20 15 10

5 0

40 41 42 43 44 45 46 47 48 49 50 51 52 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 MMWR Week

Age 0-4

Age 5-24

Age 25-49

Age 50-64

Age over 64

Page 4

Emergency Department Syndromic Surveillance

Monitoring influenza-like illness (ILI) syndromic surveillance data received by emergency departments. The ILINet electronic ILI report includes 64 facilities percent of ILI visits for MMWR week 52: 10.97%

Page 5

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download