COVID-19(8) Laboratory(8) real-time RT-PCR(8) evaluated(8) outbreak(8) the United State(8) diagnostic(8) SARS-CoV2(7) analyzed(7) evaluate(7) pandemic(7) Health(6) network(6) detect(6) public health(6) RT-rtPCR(6) mink(6) medium(5) National(5) Critical(5) cats(5) transmitted(5) molecular(5) interlaboratory comparison(5) variants(5) buffer(5) variant(5) RNA(5) United States(5) Human(5)