Influenza Surveillance Report

Influenza Surveillance Report

Division of Disease Prevention and Control Public Health Informatics CDC MMWR Week 22:

May 26, 2019 to June 01, 2019 Influenza Activity by County, State, and National Levels

Houston/ Harris County: Decreased

Texas: Decreased

CDC: Decreased

Highlights ? The Houston Health Department (HHD) conducts seasonal influenza surveillance from October (week 40) to May (week 22). In week 22, the percentage of reported influenza-like illnesses (ILI) detected in emergency centers in Houston/Harris County was 0.62% which increased from the previous week. The flu vaccine is recommended for the entire season.

Influenza Like Illness (ILI) ? The percentage of Athena ILI reports decreased to 0.04% in week 22 compared to the previous week.

Virology ? HHD receives electronic lab reports from clinical labs. During week 22, the volume of flu tests received remained comparable to the previous week. Flu A activity accounts for 97% of the cumulative flu positives this season.

Texas ? The proportion of outpatient visits for ILI (2.42%) was below the baseline (5.60%) and 1,865 pneumonia and influenza deaths have been reported in Texas during the 2018-19 flu season. No influenza-associated pediatric death was reported during week 22. A total of ten influenza-associated pediatric deaths have been reported in Texas during the 2018-2019 influenza season. No institutional outbreaks were reported in week 22.

National ? At the national level during week 22, 4.63% of specimens tested and reported to the CDC by clinical labs were positive for influenza.

Houston Health Department

1

8000 North Stadium Drive, Houston, TX

77054 (832) 393-5169



ILI Percent (%)

Syndromic Surveillance: ILI activity trend in 2018-2019

3.00% 2.50% 2.00% 1.50% 1.00% 0.50% 0.00%

Percent 0.62%

CDC MMWR Week

Syndromic Surveillance: 2018-2019 Influenza Season Age and Gender Distribution

Age group

6% 3% 23%

00-04 years

38%

05-17 years

18-44 years

45-64 years

65+ years

Gender

Female 46%

Male 54%

30%

During week 22, 0.62% of emergency center (EC) visits were due to influenza-like illness (ILI) complaints. Of the 746 patients presenting with ILI, the age group that recorded the most EC visits was the 00 to 04 years old (38%). Females accounted for 54% of patients presenting with ILI.

NOTE: ILI activity is assessed using information provided by the Southeast Texas Syndromic Surveillance System and includes data from 67

hospitals and 17 school-based clinics. Influenza-like illness (ILI) is defined as the mention of fever AND cough, OR fever AND sore throat, OR

flu in the patient's Emergency Department (ED) chief complaint. These data do not represent laboratory confirmed cases of influenza nor do

they represent all ED visits in Houston/Harris County.

Houston Health Department

2

8000 North Stadium Drive, Houston, TX

77054 (832) 393-5169



Syndromic Surveillance: Geographic Distribution Map of ILI

During week 22, the zip codes with the highest percent of ED visits (1.35 or greater) were: 77072, 77039, 77081, 77031, 77036, 77565, 77085, 77504, 77045 and 77037

NOTE: Houston/Harris County ILI report distribution map was created using data provided by the Southeast Texas Syndromic Surveillance System and includes data from 67 hospitals and 17 school-based clinics. This map reflects the number of ILI cases from each residential zip code during the current week of reporting. Influenza-like illness (ILI) is defined as the mention of fever AND cough, OR fever AND sore throat, OR flu in the patient's ED chief complaint. These data do not represent laboratory confirmed cases of influenza nor do they represent all ED visits in Houston/Harris County.

Houston Health Department

3

8000 North Stadium Drive, Houston, TX

77054 (832) 393-5169



Athena: ILI percentage per week from 2018-19

ILI Percent

0.45% 0.40% 0.35% 0.30% 0.25% 0.20% 0.15% 0.10% 0.05% 0.00%

0.06%

10/7/2018 10/14/2018 10/21/2018 10/28/2018

11/4/2018 11/11/2018 11/18/2018 11/25/2018

12/2/2018 12/9/2018 12/16/2018 12/23/2018 12/30/2018

1/6/2019 1/13/2019 1/20/2019 1/27/2019

2/3/2019 2/10/2019 2/17/2019 2/24/2019

3/3/2019 3/10/2019 3/17/2019 3/24/2019 3/31/2019

4/7/2019 4/14/2019 4/21/2019 4/28/2019

5/5/2019 5/12/2019 5/19/2019 5/26/2019

Week Start Date

Athena: ILI per week by age group

60

50

ILI Count

40

Age: 65 or Older

30

Age: 50 - 64

Age: 18 - 49

20

Age: 5 - 17

Age: 0 - 4

10

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 22 Week

In week 22, ILI accounted for 0.06% of outpatient visits in the Athena network. The total count of ILI visits reported within the network was 4.

Houston Health Department

4

8000 North Stadium Drive, Houston, TX

77054 (832) 393-5169



Flu Near You: ILI per week

ILI Count

ILI

50

45

40

35

30

25

20

15

10

5

4

0

10/8/2018 10/15/2018 10/22/2018 10/29/2018

11/5/2018 11/12/2018 11/19/2018 11/26/2018

12/3/2018 12/10/2018 12/17/2018 12/24/2018 12/31/2018

1/7/2019 1/14/2019 1/21/2019 1/28/2019

2/4/2019 2/11/2019 2/18/2019 2/25/2019

3/4/2019 3/11/2019 3/18/2019 3/25/2019

4/1/2019 4/8/2019 4/15/2019 4/22/2019 4/29/2019 5/6/2019 5/13/2019 5/20/2019 5/27/2019

Week Start Date

Flu near You (FNY) is a participatory surveillance tool that compliments traditional disease surveillance. The count of Flu Near You () users reporting ILI in the week of 05/27/2019 increased from 1 to 4 in the previous week. See the last page for information on how to participate.

School Surveillance October 2018 - May 2019

Table 1: ILI and Influenza Cases by Type and School Type1 per Month

Month

Oct Nov Dec DJeacn SFuemb Mar Apr May Sum

Total

Lab

Cases Confirmed

#

66 15

64 11

56 10

129 56 33

726 1529853 379 110

271 122

85

44

1776 628

%

23% 17% 18% 1206% 394%44 29% 45% 52% 30%

Flu A

Flu B

A+B

Unclassified

Elementary Schools

Middle Schools

High Schools

Multilevel Schools

2 5 12 1286% 5428% 28 22 7 156

4

0

1

1

0

0

0 12 1

19 115 8

7

2

7

5

6

0

44 17

8 52 0 0 94 0 60 197 1 67 90 31 439

54 55 51 0102 533117 275 221 69 1358

2 0 3 51 15 721342 36 11 10 219

4

6

4

5

1

1

3 9 1 31

64 25 50

55 28 116 18

24

15

1

5

116

81

School surveillance for ILI began in October for the current flu season. In May, a total of 85 cases were

reported. The highest number of cases (69) were among elementary school students.

NOTE: Data on student ILI and influenza cases is collected from 306 schools within Houston Independent school district.1 School will be counted more than once if more than one case from the same school is reported during the same reporting period.

Houston Health Department

5

8000 North Stadium Drive, Houston, TX

77054 (832) 393-5169



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