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Testing Results

Testing

TRACE OSU tests students, faculty and staff at campuses in Corvallis and Bend and at the Hatfield Marine Science Center in Newport. Participation is voluntary and open to all current members of the OSU community who reside close enough to be tested. Individuals are randomly selected from each group to estimate the actual prevalence of the novel coronavirus in each location.

NOTE: The results below differ from those shown on OSU’s COVID-19 website, which include the weekly number of confirmed and presumptive COVID-19 cases as provided to the university by the Benton County Health Department involving students, faculty and staff affiliated with Oregon State University’s Corvallis campus. While the health department includes TRACE OSU data, the county’s numbers also include testing results and presumptive cases from other health-care providers in Benton County. TRACE OSU reports only results from the TRACE project.

Number of positive cases in the previous week (April 12-16)

0

students

living on or near Corvallis campus

0

faculty and staff

living on or near Corvallis campus

0

students and employees

living on or near OSU-Cascades

0

students and employees

living on or near HMSC


Number of tests completed in the previous week (April 12-16)

301

students

living on or near Corvallis campus

332

faculty and staff

living on or near Corvallis campus

0

students and employees

living on or near OSU-Cascades

116

students and employees

living on or near HMSC


Cumulative number of tests since the beginning of the program (as of April 16)

9,243

students

living on or near Corvallis campus

8,534

faculty and staff

living on or near Corvallis campus

697

students and employees

living on or near OSU-Cascades

1,287

students and employees

living on or near HMSC


Percentage of tests that were positive (as of April 20)

The number of positive test results divided by the total number of tests that were run during the previous fourteen calendar days.

0.33%

students

living on or near Corvallis campus

0.16%

faculty and staff

living on or near Corvallis campus

No surveillance testing

students and employees

living on or near OSU-Cascades

0%

students and employees

living on or near HMSC

Prevalence

Prevalence is a leading indicator of the risk posed by the coronavirus in a community. Higher prevalence means that more people carry the virus, and therefore your risk of contracting it is higher. Prevalence is a statistical measure that takes into account sampling design, and reliability of the tests.

TRACE OSU prevalence estimate (for week of April 12-16)

An estimate of the fraction of the population who are infected with the virus during the week the samples were collected. Prevalence differs from percent positivity because it adjusts for factors such as the sampling design and reliability of the test. We report prevalence as the number of people in the population that are infected per 1000 individuals.

*__

in 1,000

OSU students living on or near Corvallis campus

*__

in 1,000

OSU faculty and staff living on or near Corvallis campus

No surveillance testing

OSU students and employees living on or near OSU-Cascades

*__

in 1,000

OSU students and employees living on or near HMSC

* Because we observed 0 positive cases in this group this week, the point estimate for prevalence is 0. But because we know the true prevalence in the population is likely not 0, we avoid displaying a “0" and instead write the result as “—“


TRACE Community prevalence estimate

An estimate of the fraction of the population who are infected with the virus during the week the samples were collected. Prevalence differs from percent positivity because it adjusts for factors such as the sampling design and reliability of the test. We report prevalence as the number of people in the population that are infected per 1000 individuals.

13

in 1,000

in Corvallis on March 13 and 14, 2021

1

in 1,000

in Bend on May 30 and 31, 2020

5

in 1,000

in Eugene on November 7 and 8, 2020

32

in 1,000

in Redmond on January 29, 30, and 31, 2021

Wastewater sampling

Since all people who use toilet facilities contribute to wastewater flow, TRACE samples wastewater in communities and at OSU to complement individual testing. Wastewater provides another indication of the presence of the coronavirus in the region being sampled. Samples from wastewater in communities and OSU are analyzed at OSU.

OSU Wastewater scores


The concentration on the most recent sampling dates indicated a moderate viral load on 4/11/2021 and a viral load below the detection limit on 4/13/2021 at OSU Corvallis Campus
The data represented on this graph show the level and change in coronavirus concentrations found within wastewater collected at OSU, Corvallis Campus.  Higher concentrations suggest greater numbers of COVID-19 infections at that time on the Corvallis Campus, while lower concentrations suggest fewer COVID-19 infections. Green circles on the graph indicate that the concentration of the virus was so low that it was below the limit of detection in the wastewater sample. Please note that the data on this chart are plotted on the log scale.  This means that data points in the yellow “Moderate” zone are roughly 10 times greater than those in the blue “Low” zone.  Similarly, data points in the orange “Strong” zone are roughly 10 times greater than those in the yellow “Moderate” zone and 100 times greater than those in the blue “Low” zone.  Finally, data points in the red “Very Strong” zone are roughly 10 times greater than those in the orange “Strong” zone, 100 times greater than those in the yellow “Moderate” zone and 1,000 times greater than those in the blue “Low” zone. The latest sampling dates were 4/11/2021 and 4/13/2021.

 The concentration on the most recent sampling dates indicated a strong viral load on 4/5/2021 and a low viral load on 4/12/2021 at OSU-Cascades Campus
The data represented on this graph show the level and change in coronavirus concentrations found within wastewater collected at OSU-Cascades.  Higher concentrations suggest greater numbers of COVID-19 infections at that time on the OSU-Cascades campus, while lower concentrations suggest fewer COVID-19 infections. Green circles on the graph indicate that the concentration of the virus was so low that it was below the limit of detection in the wastewater sample. The latest sampling dates were 4/5/2021 and 4/12/2021.

The concentration on the most recent sampling dates indicated a viral load below the detection limit on 3/31/2021 and a low viral load on 4/7/2021 at Hatfield Marine Science Center
The data represented on this graph show the level and change in coronavirus concentrations found within wastewater collected at Hatfield Marine Science Center.  Higher concentrations suggest greater numbers of COVID-19 infections at that time at HMSC, while lower concentrations suggest fewer COVID-19 infections. Green circles on the graph indicate that the concentration of the virus was so low that it was below the limit of detection in the wastewater sample. The latest sampling dates were 3/31/2021 and 4/7/2021.

Community wastewater scores


The concentration on the most recent sampling dates (4/12/2021 and 4/13/2021) indicated a moderate viral load in the City of Corvallis
The data represented on this graph show the level and change in coronavirus concentrations found within wastewater collected from the city of Corvallis wastewater treatment plant.  Higher concentrations suggest greater numbers of COVID-19 infections at that time within the Corvallis community, while lower concentrations suggest fewer COVID-19 infections. Green circles on the graph indicate that the concentration of the virus was so low that it was below the limit of detection in the wastewater sample. The latest sampling dates were 4/12/2021 and 4/13/2021.

The concentration on the most recent sampling dates (4/9/2021 and 4/11/2021) indicated a strong viral load in the City of Bend
The data represented on the Bend graph show the level and change in coronavirus concentrations found within wastewater collected from the city of Bend wastewater treatment plant. Higher concentrations suggest greater numbers of COVID-19 infections at that time within the Bend community, while lower concentrations suggest fewer COVID-19 infections. Green circles on the graph indicate that the concentration of the virus was so low that it was below the limit of detection in the wastewater sample. Please note that the data on this graph are plotted on the log scale.  This means that data points in the yellow “Moderate” zone are roughly 10 times greater than those in the blue “Low” zone.  Similarly, data points in the orange “Strong” zone are roughly 10 times greater than those in the yellow “Moderate” zone and 100 times greater than those in the blue “Low” zone.  Finally, data points in the red “Very Strong” zone are roughly 10 times greater than those in the orange “Strong” zone, 100 times greater than those in the yellow “Moderate” zone and 1,000 times greater than those in the blue “Low” zone.  The latest sampling dates were 4/9/2021 and 4/11/2021.  

The concentration on the most recent sampling dates indicated a low viral load on 4/1/2021 and a moderate viral load on 4/8/2021 in the City of Newport
The data represented on this graph show the level and change in coronavirus concentrations found within wastewater collected from the city of Newport wastewater treatment plant.  Higher concentrations suggest greater numbers of COVID-19 infections at that time within the Newport community, while lower concentrations suggest fewer COVID-19 infections. Green circles on the graph indicate that the concentration of the virus was so low that it was below the limit of detection in the wastewater sample. The latest sampling dates were 4/1/2021 and 4/8/2021.