Wisconsin continues to experience extremely low influenza activity at present. Other than SARS-CoV-2, the only other virus we are seeing in any abundance is rhinovirus. Wisconsin has recorded no influenza deaths for the 2020-2021 season.
Across the U.S. there have been 243 (0.06%) influenza detections at public health laboratories, from 438,098 specimens, since September 27, 2020 (this is incredibly low). Of detected viruses, 61% have been influenza A and 39% have been influenza B. The percentage of primary care patients with influenza-like illness has not risen above baseline and there has been only one pediatric influenza-associated death reported in the U.S. this season.
The most commonly identified viral cause of acute respiratory infections in Wisconsin is SARS-CoV-2. For the week ending April 19, 2021, 4.2% of 72,540 specimens tested at the Wisconsin State Laboratory of Hygiene and clinical labs were positive for SARS-CoV-2.
|Viruses in Circulation*||Percent|
|*estimate based on WSLH statewide data|
|** includes HKU1, NL63, 229E and OC43|
As of today, 150,640,276 global cases have been confirmed, with 3,168,705 reported deaths (CFR = 2.1%). There have been 32,290,529 laboratory-confirmed cases reported in the United States with 575,200 deaths (CFR = 1.8%). Closer to home, there have been 597,258 confirmed cases in Wisconsin (an increase of 20,163 cases from last report), with 6,815 deaths (an increase of 193 deaths from last report; CFR = 1.1%). Please note that the CFRs reported here are crude and based only on laboratory confirmed cases.
We are seeing a slight increase in SARS-CoV-2 transmission. The 7-day average for patients hospitalized for COVID-19 in Wisconsin is 351 and a 7-day v=average of 112 (32%) requiring intensive care.
Over the past 14 days, there has been an increase in the growth rate of new cases per day (2.4 more cases each day).
Wisconsin’s COVID-19 vaccine rollout is underway with 4,248,455 doses allocated, and 4,363,653 doses administered as of 4/27/2021. Across Wisconsin, 1,929,913 individuals (33.1% of the population) are now fully vaccinated.
- The overall cumulative rate for COVID-19 hospitalization across the U.S. is 531.5/100,000 (one admission for every 188 people).
- The overall cumulative death rate for COVID-19 across the U.S. is 175.4/100,000 (one death for every 570 people).
-11.8% of deaths during week 16 (April 18-24) were due to pneumonia, influenza or COVID-19.
Please refer to guidance provided by Wisconsin Department of Health Services, available at:
and by the U.S. Centers for Disease Control and Prevention, available at:
* 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.