Data at a Glance November 6th 2022 - November 12th 2022 (Week 45)

Oregon Public Health Division

Published January 20th, 2023

Data at a Glance

January 08, 2023--January 14, 2023 (Week 2)

Current Week (2)

Previous Week (1)

Percentage positive influenza tests1

2.8%

7.1%

Portland tri-county influenza-associated hospitalizations2*

18

51

Reported influenza outbreaks3

2

2

Influenza-associated pediatric mortality3

0

0

Percentage of emergency department visits for ILI4

1.2%

1.8%

1Percent positivity based on data from Oregon reporters to the National Respiratory and Enteric Virus Surveillance System (NREVSS) 2Based on hospitalization surveillance in Clackamas, Multnomah, and Washington counties. 3Based on reports made to the Oregon Health Authority 4Based on Oregon ESSENCE Syndromic Surveillance. Data represent statewide aggregate percent.

Laboratory Surveillance: The National Respiratory and Enteric Virus Surveillance System (NREVSS) is a laboratory-based system that monitors influenza and other respiratory viruses circulating the United States.

Table 1. Influenza Test Results in Oregon, NREVSS, Current Week, 2022?2023 Season

Portland Tri-County Influenza Hospitalizations: In Clackamas, Multnomah, and Washington counties 44 influenza-associated hospitalizations occurred during week 2 of 2023. There have been 989 reported hospitalizations during the 2022-2023 season. The cumulative hospitalization rate for the 20222023 season is 53.7 per 100,000 people.

Influenza Outbreaks: There were 2 influenza outbreaks reported during week 2, 2023, there have been 133 reported outbreaks during the 2022-2023 season.

Oregon ESSENCE Syndromic Surveillance: Oregon Public Health tracks hospital emergency department (ED) visits throughout the state using the Oregon ESSENCE syndromic surveillance system. ESSENCE categorizes chief complaints into syndrome categories, which include influenza-like illness (ILI). Figure 5, below, displays percentages for all of Oregon during this influenza season compared with the previous two influenza seasons. The percent of ED visits for ILI in all of Oregon was 1.2% during week 2, 2023.

Influenza-Associated Pediatric Mortality Surveillance: Influenza-associated deaths in children 17 years of age and younger are nationally notifiable. There were no pediatric influenza deaths in Oregon reported during week 2, 2023, and 2 pediatric deaths reported to the Oregon Health Authority in the 20222023 influenza season.

Influenza Immunizations:

The Oregon Immunization Program (OIP) tracks seasonal influenza immunizations on a weekly basis using the ALERT Immunization Information System (ALERT IIS). The ALERT IIS is Oregon's registry of immunizations given to people in Oregon. As of the current date, ALERT IIS has 1.32 million reported influenza immunizations for Oregon residents. Currently the rate of new influenza immunizations going into January is similar to the prior two seasons.

A topic of concern is the decline of influenza immunizations among Oregon children in the last two flu seasons. Child influenza immunizations dropped by 24% from 2020-21 to 2021-22. For the current season, child influenza immunizations have dropped another 5% compared to 2021-22. Overall across the last two seasons child influenza immunizations have dropped by 29%- with cumulative declines of 29% for younger children age 6 months to 6 years, 30% for children age 7 to 12 years, and 28% among adolescents age 13 to 17 years.

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