The 2017 city and county fair season in the Midwest is now underway. During recent summers, swine exhibitions at agricultural fairs and other direct or indirect exposure to swine have been associated with human infections caused by variant influenza A viruses that include A/H3N2v, A/H1N2v and A/H1N1v. So far this year, no human cases of variant influenza A have been detected in humans in the United States although swine flue has been detected in two Midwest states including Wisconsin.
Please see the attached request sent out through the Wisconsin Division of Public Health.
Wisconsin's influenza activity has declined to baseline, with 80% of recent detections being influenza B. There have been 3,861 influenza-related hospitalizations since September 1, 2016, with 450 admitted to ICU and 101 requiring mechanical ventilation. 67% of hospitalizations have been in individuals age 65 and older. Across the US one out of every 350 people age 65 and older has been hospitalized with laboratory-confirmed influenza.
The estimated prevalence of influenza-like illness [fever of 100 degrees F or higher and either cough or sore throat] in Wisconsin's primary care patients is at 1.3% and is stable.
7.2% 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 1.6%
The most commonly identified viral causes of Acute Respiratory infections (ARI) in Wisconsin is rhinovirus/enterovirus. Over the past 4 weeks the typical ARI case presenting for primary care has been 33.5 years old and 70% of patients have been female. 44% of patients identified a sick contact 1-to-3 days before illness onset and typically present to the clinic 3.6 days after illness onset. 21% of illnesses are characterized as mild, with 68% having moderate symptoms and 11% having severe symptoms.
nasal congestion 56%
nasal discharge 58%
sore throat 68%
Prophylaxis - It is reasonable to stop routinely vaccinating as of May 1st; continue to offer influenza vaccine to high-risk individuals.
For the 2016-2017 season to date (last week):
For up to date information, visit the zika page on CDC.
* 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.