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Indiana State Department of Health

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Influenza Surveillance Summary Influenza Surveillance Summary

Influenza (Flu) Surveillance in Indiana

Week 17 (April 25 - May 1, 2010) Summary

Burden of Influenza-Like Illness in the Community

  • The percentage of ILI reported by the emergency department (ED) surveillance system increased slightly compared to the previous week (1.0 % compared to 0.9%, respectively).
  • The percent of patients presenting at sentinel providers with ILI decreased slightly compared to the previous week (0.5% compared to 0.6%, respectively).

Severity of Influenza-Like Illness and/or Pneumonia in the Community

  • The percent of patients presenting at sentinel providers with ILI decreased slightly compared to the previous week (0.5% compared to 0.6%, respectively).
  • 0% (0/42) of reporting hospitals stated that the number of ILI-related hospitalizations is currently “slightly elevated” or “elevated” compared to previous years.  This is compared to 2% from the previous reporting week.
  • There was 1 confirmed influenza-related death reported during Week 17, 2010 (individual had underlying medical conditions; influenza virus subtype was not determined).
  • There have been a total of 43 influenza-related deaths since June 1, 2009, of which 39 had confirmed 2009 H1N1.

Effect of Influenza-like Illness on Populations at Risk

  • ILI-related absentee rates in health care personnel decreased by 26% compared to the weighted moving average from the previous three weeks (0.11 compared to 0.14 ILI-related absences per 100 employees, respectively).

Laboratory and Vaccination Information

  • During Week 17, 2010, 0/4 (0%) specimens tested by the ISDH Laboratory for influenza were positive.
  • Since September 1, 2009, 98.4% (478/486) of specimens that were positive for influenza were 2009 H1N1.
  • 84% of the 2009 H1N1-positive specimens submitted have been collected from persons 0 – 24 years of age.
  • In Indiana, as of May 4, 2010, a total of 1,350,739 2009 H1N1 vaccinations had been given and recorded into the Children and Hoosiers Immunization Registry Program (CHIRP) database.
  • According to CHIRP data, 29.6% of the estimated number of “high risk” persons in Indiana have received the 2009 H1N1 vaccine.
  • Of the 322,765 children, 6 months – 9 years of age, who have received the 1st dose of 2009 H1N1, 60% (193,982 children) received it >28 days ago and have not received the 2nd recommended dose.
  • A total of 107,777 children, 6 months – 9 years of age, have received the recommended two doses of 2009 H1N1 (The CDC recommends that children, 6 months – 9 years of age, receive two doses of 2009 H1N1 vaccine at least 28 days apart to have a high level of immunity).

  • State health officials say they will be providing a weekly update on influenza (flu) activity in Indiana each Wednesday, starting September 23, 2009. This update will include general information on flu activity, based on surveillance across the state, but will NOT include flu case counts on either the state or the county level. A summary of influenza surveillance in Indiana will be posted on this site every Wednesday.

    The Indiana State Health Department will be monitoring all influenza activity in the state, both seasonal influenza and the 2009 H1N1 influenza A through the use of influenza sentinel surveillance and the Public Health Emergency Syndromic System (PHESS). Through this system, data is collected from hospital emergency departments on a daily basis and analyzed by the State Health Department’s epidemiologists. State health officials will also be tracking hospitalizations from influenza-like illnesses and pneumonia and flu-related deaths and reporting that information on a statewide level.

    Indiana has 58 influenza sentinel sites distributed around the state in outpatient settings. When individuals seek medical care for influenza-like illness at the sentinel sites, the practitioner performs a nasal swab and sends it to the state laboratory. The state laboratory tests the swab for influenza A and if it is positive, the laboratory does further testing to determine the subtype of influenza. This allows state health officials to determine what types of influenza viruses are circulating.

    During the spring of 2009, as the novel H1N1 influenza was beginning to spread across the United States, Indiana confirmed its first case after a patient was seen with influenza-like illness at a flu sentinel site and had routine testing as part of this surveillance system. Since the pandemic was declared in June 2009, the State Health Department has increased the number of sentinel sites across the state to improve surveillance.