definition of Rapid of COVID-19
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Answer:
COVID-19 rapid antigen tests, also frequently called COVID-19 lateral flow tests, are rapid antigen tests used to detect SARS-COV-2 infection. They are quick to implement with minimal training, offered significant cost advantages, costing a fraction of other forms of COVID-19 testing and give users a result within 5–30 minutes. However, they have a high false negative rate. Rapid antigen tests are used in several countries as part of mass testing or population-wide screening approaches. They are thought to be valuable for identifying individuals who are asymptomatic and could potentially spread the virus to other people, who would otherwise not know they were infected. This differs from other forms of COVID-19 testing, such as PCR, that are generally seen to be a useful test for symptomatic individuals, as they have a higher sensitivity and can more accurately identify cases.
Answer:
Rapid diagnostic tests (RDT) detect the presence of viral proteins (antigens) expressed by the COVID-19 virus in a sample from the respiratory tract of a person.
If the target antigen is present in sufficient concentrations in the sample, it will bind to specific antibodies fixed to a paper strip enclosed in a plastic casing and generate a visually detectable signal, typically within 30 minutes