RE: Official Airport testing17 Jul 2020 00:29
Re earlier discussion about the POC BD-Veritor- covid test machine - and whether it is better than PCR. Wbernard already posed the question that if it was better then why are negative results recommended to be retested by molecular?Some more information from a 17 page pdf (if you Google it you can click directly into the pdf - but that doesn't allow me to copy a link here. It's not designed for use on asymptomatic patients and the 84/100% results achieved seem to have been under ideal conditions rather than real world.
LIMITATIONS OF THE PROCEDURE
• Clinical performance was evaluated with frozen samples, and test performance may be different with fresh samples.
• Users should test specimens as quickly as possible after specimen collection.
• Positive test results do not rule out co-infections with other pathogens.
• Results from the BD Veritor System for Rapid Detection of SARS-CoV-2 test should be correlated with the clinical
history, epidemiological data, and other data available to the clinician evaluating thepatient.
• A false-negative test result may occur if the level of viral antigen in a sample is below the detection limit of the test
or if the sample was collected or transported improperly; therefore, a negative test result does not eliminate the
possibility of SARS-CoV-2 infection.
• The amount of antigen in a sample may decrease as the duration of illness increases. Specimens collected after
day 5 of illness are more likely to be negative compared to a RT-PCR assay.
• Failure to follow the test procedure may adversely affect test performance and/or invalidate the testresult.
• The contents of this kit are to be used for the qualitative detection of SARS-CoV-2 antigens from nasal swab
The
BD Veritor System for Rapid Detection of SARS-CoV-2 is designed to detect the presence or absence of SARS-CoV-2
nucleocapsid proteins in respiratory samples from patients with signs and symptoms of infection who are suspected of
COVID-19
SPECIMEN COLLECTION AND HANDLING
Specimen Collection and Preparation
Acceptable specimens for testing with this kit include nasal swab specimens obtained by the dual nares collection method. It
is essential that correct specimen collection and preparation methods be followed. Specimens obtained early during symptom
onset will contain the highest viral titers; specimens obtained after five days of symptoms are more likely to produce negative
results when compared to an RT-PCR assay. Inadequate specimen collection, improper specimen handling
and/or transport may yield a falsely negative result; therefore, training in specimen collection is highly recommended due to
the importance of specimen quality for generating accurate test results.
Negative Test – Negative results are presumptive. Negative test results do not preclude infection and should not be used as
the sole basis for treatment or other patient management decisions, including infection control decisions, particular