Review of Influenza Activity in San Diego County

Transcription

1 2015 Kick the Flu Summit Review of Influenza Activity in San Diego County Season Jeffrey Johnson, MPH Senior Epidemiologist Epidemiology & Immunization Services Branch Public Health Services 9/18/2015

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3 Headlines from last influenza season.

4 Headlines from last influenza season.

5 Rates of Estimated Vaccine Effectiveness by Season Last Season Influenza Season Source: Centers for Disease Control and Prevention

6 Influenza Surveillance World U.S. California San Diego County

7 Purpose Top 5 Reasons Influenza Surveillance Matters 1. To measure population impact 2. To identify novel influenza strains 3. To assess match of circulating strains to vaccine 4. To identify outbreaks and severe illness trends 5. To provide surveillance data to stakeholders

8 INFLUENZA SURVEILLANCE ACTIVITIES San Diego County Case Reporting and Data Collection Data Analysis Sentinel Sites Syndromic Surveillance Media Requests Laboratory Testing Outbreak Detection Preparing Reports

9 LAST FLU SEASON (2014/2015) 7,395 TOTAL REPORTED INFLUENZA Total Reported CASES influenza cases 154 ICU CASES 97 DEATHS 78 CONFIRMED OUTBREAKS

10 INFLUENZA TYPE, 2014/2015 Flu Type Flu Sub-type/Strain Count Percentage Influenza A 4,830 Flu A Influenza A (H3) Seasonal 1, % Influenza A (H1N1)pdm09 9 Influenza B 1,122 Flu B Influenza B/Yamagata Influenza B/Victoria % Flu A/B Influenza A/B % N = 7,395

11 Influenza Detections by Type and Week, Number of cases 1200 N = 7, Week Influenza A Influenza A(H1N1)pdm09 Influenza A(H3) Influenza B Influenza B/Victoria Influenza B/Yamagata

12 INFLUENZA SEASONS Cumulative # Influenza Reports Cumulative Influenza Case Reports by Week & Season N=7, N=6, N=5, week #

13 INFLUENZA ACTIVITY HEAT MAP Week ICU Cases Deaths Outbreaks Calls Specimens ED % ILI AUG SEP OCT NOV DEC JAN FEB MAR APR

14 INFLUENZA CASES BY REGION 2014/2015 REGION East Central N. Central N. Coastal N. Inland South # of CASES RATE Per 100,

15 INFLUENZA BY GENDER, 2014/2015 Female Male 3,650 Cases 3,164 Cases 53.4% 46.1% Note: 531 cases (7%) were missing gender information

16 INFLUENZA CASES BY AGE 2014/ Frequency of Cases by Age N = 7,

17 Influenza Cases by Age Group, 2014/2015 Number and Age Specific Incident Rate 2400 Count Rate per 100K 2, , , ,400.0 Count , , Rate per 100K

18 INFLUENZA DEATHS BY SEASON Seasonal / Un-typed Pandemic H1N1

19 INFLUENZA DEATHS, 2014/2015 N = 97 Female 57.0% Male 43.1% 100% Had underlying health conditions 22% Were residents of a long term care facility with a reported flu outbreak Frequency by Age Range years

20 Influenza Case Severity Rates, 2014/2015 By Age Group Rate Flu Severity (ICU) Rate per 100K Case Fatality Rate

21 Influenza Outbreaks N=78 Frequency by Week Outbreak Was Reported Flu outbreaks All outbreaks lab confirmed 1,050 total cases Avg. of 13 cases per outbreak 22 deaths among residents of outbreak locations (e.g. LTCF) Week

22 CASE EXAMPLE: FLU OUTBREAK Outbreak A 44 cases Call from LTCF Public Health Response Initiate use of anti-virals Hosp Death #1 77% of staff vaccinated 67% of residents vaccinated Last day of new onset of ILI Monitoring for additional cases Outbreak closed Residents & staff ill Multiple hospitalizations for flu Hosp Death #2

23 OUTBREAK DETECTION Expanded Approaches Individually Reported & Registered Cases Matching by Disease & Address D O B Potential Outbreak Detected Public Health Investigation Initiated

24 SURVEILLANCE REPORTS Influenza Watch report posted and ed weekly Regular alerts and updates through CAHAN Information used in HHSA reports and press releases

25 ELECTRONIC DEATH REGISTRATION DETECTION Death occurs Physicians diagnose and staff initiates electronic record Electronic registration process at County Cause of death detector Influenza Deaths matched to communicable disease registry! Detection

26 Flu Forecast?

27 ** CURRENT UPDATE ** Reported Influenza Cases Since July 1, TOTAL REPORTED INFLUENZA CASES Flu A 65% 0 ICU CASES 0 DEATHS Count Flu B 35% Week

28 REPORTING FLU CASES Please report positive influenza results to public health Lab results and demographics Fax to Please report influenza deaths Please report influenza ICU cases Please report influenza outbreaks Questions about reporting? Call

29 THANK YOU For More Information

30 CASE EXAMPLE: FLU OUTBREAK Outbreak A 44 cases