Wisconsin is at near peak influenza activity at present. There has been a shift in Wisconsin from influenza A[H1N1] to A[H3N2]. Also, there has been a shift in influenza A[H3N2] viruses to a clade (smaller genetic clustering of viruses) that is not well covered by this year’s vaccine. As of March 9, 2019, there had been 1,638 influenza-related hospitalizations since September 1, 2018; 46% of hospitalizations have been in individuals age ≥ 65 years; 295 individuals have been admitted to ICUs (38% with age ≥ 65 years) and 85 have required mechanical ventilation (40% with age ≥ 65 years.
The prevalence of influenza-like illness [fever of 100oF or higher and either cough or sore throat] in Wisconsin's primary care patients is 3.4% and is nearing its peak.
10.6% of last week's primary care patients had all-cause respiratory infections.
The prevalence of acute diarrheal illness (ADI) in Wisconsin's primary care patients is at 1.8%; the most common pathogen is norovirus.
The most commonly identified viral cause of acute respiratory infections (ARI) in Wisconsin is Influenza A. Over the past 4 weeks the typical ARI case presenting for primary care has 31.7 years old and 56% of patients have been female. 55% of patients identified a sick contact 1-to-3 days before illness onset and typically present to the clinic 3.5 days after illness onset. 25% of illnesses are characterized as mild, with 65% having moderate symptoms and 8% having severe symptoms.
|Typical Symptoms||Percent||Viruses in Circulation||Percent|
Antivirals need to be started within 48 hours of symptom onset to be effective against influenza.
Antivirals started after 48 hours may be effective for hospitalized patients with confirmed influenza.
For the 2018-2019 season to date (last week):
From January 1 to March 14, 2019, 268 individual cases of measles have been confirmed in 15 states. The states that have reported cases to CDC are Arizona, California, Colorado, Connecticut, Georgia, Illinois, Kentucky, Michigan, Missouri, New Hampshire New Jersey, New York, Oregon, Texas, and Washington. According to the American Academy of Pediatrics, “at least 20 states have introduced bills this year that would broaden the reasons why parents can exempt kids from getting vaccines even if there isn’t a medical need.”
As the Democratic Republic of the Congo Ebola outbreak is unfolding in a war zone, security incidents and pockets of community resistance continue to impact civilians and front line workers, requiring the response to continually adapt to the situation. This is now the 2nd largest Ebola outbreak in history.
Latest numbers as of 19 March 2019
Total cases: 980 (confirmed = 915, probable cases = 65)
Deaths: 610 (confirmed = 545, probable deaths = 65)
Case Fatality Rate: 62.2%
* The weekly influenza update is adapted from an email from Jon Temte, MD, PhD; Chair, Wisconsin Council on Immunization Practices; Professor, Department of Family Medicine and Community Health, University of Wisconsin School of Medicine and Public Health.