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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 (October 12–16)

2

students

living on or near Corvallis campus

5

faculty and staff

living on or near Corvallis campus

0

students and employees

living on or near OSU-Cascades

1

students and employees

living on or near HMSC


Number of tests completed in the previous week (October 12–16)

509

students

living on or near Corvallis campus

465

faculty and staff

living on or near Corvallis campus

122

students and employees

living on or near OSU-Cascades

94

students and employees

living on or near HMSC


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

1161

students

living on or near Corvallis campus

1136

faculty and staff

living on or near Corvallis campus

188

students and employees

living on or near OSU-Cascades

168

students and employees

living on or near HMSC


Percentage of tests that were positive (as of October 23)

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

0.29%

students

living on or near Corvallis campus

0.54%

faculty and staff

living on or near Corvallis campus

0%

students and employees

living on or near OSU-Cascades

1.04%

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 October 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.

7

per 1,000

OSU students living on or near Corvallis campus

18

per 1,000

OSU faculty and staff living on or near Corvallis campus

—*

No positive cases observed this week

OSU students and employees living on or near OSU-Cascades

18

per 1,000

OSU students and employees living on or near HMSC

* No positive cases observed this week. There may still be positive cases among this demographic.


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.

3

in 1000

in Corvallis on September 26 and 27

1

in 1000

in Bend on May 30 and 31

6

in 1000

in Newport on July 11 and 12

169

in 1000

in Hermiston on July 11 and 12

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 score

OSU wastewater analysis results will be posted on this website the week of October 19.


Community wastewater scores

The concentration on the four most recent sampling dates indicated a low-moderate viral load for Corvallis. The latest sampling date was 9/29/20.
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 9/28/20 and 9/29/20.

The concentration on the most recent sampling date indicated a moderate viral load in 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 concentration on the most recent sampling date indicated a moderate viral load in Bend
The data represented on this 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.