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“Universal and serial RT-PCR testing in SNFs can identify cases during an outbreak, and rapid isolation and cohorting can help interrupt transmission.”

Another example of the effectiveness of a targeted “test everyone” regardless of the symptoms. cdc.gov/mmwr/volumes/6…
Serial testing is one of the reason why when you go to testing labs like @UWVirology you see a lot of negative tests and low positivity rate.

They’re supporting serial screenings of HCW in LTCF (and many other “spreadable” occupations).
“All SNF clinical and nonclinical staff members were also screened [weekly] for SARS-CoV-2 by RT-PCR during March 29–April 10. Nineteen of 99 (19%) residents and eight of 136 (6%) staff members had positive test results for SARS-CoV-2 during March 28–April 10”
“14 of the 19 residents with COVID-19 were asymptomatic at the time of testing. Among these residents, 8 developed symptoms 1–5 days after specimen collection and were later classified as presymptomatic; one of these patients died.”

The reason to test people with no symptoms.
“In total, 3 residents were identified with COVID-19 based on testing conducted because of symptoms, and 16 additional residents were identified with COVID-19 because of RT-PCR testing, two of whom reported or were identified with symptoms at the time of RT-PCR testing”
“Swift isolation and cohorting of residents with COVID-19 reduced further transmission within the SNF; residents who had positive test results were quickly transferred out of the SNF, either to the acute care hospital or directly to a separate COVID-19 recovery unit.”
“The conversion of ward A into a COVID-19 recovery unit allowed cohorting of clinically stable residents within the SNF without requiring transfer to the affiliated hospital. This measure decreased burden on the hospital and allowed residents to remain in a familiar setting.”
“Restricting staff movement between SNF wards reduced potential for transmission between wards. With these measures, the outbreak in ward A was suppressed within 1 week, the outbreak in ward C was suppressed within 2 weeks, and no cases occurred in ward B.”
“At the time of the VAGLAHS SNF outbreak, the Los Angeles County Department of Public Health criteria for testing did not include RT-PCR testing of asymptomatic persons”

And example of how a decision to restrict testing (to conserve resources?) can help propagate the disease.
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