The novel coronavirus that caused the epidemic and pandemic resulting in the acute respiratory illness known as coronavirus disease 2019 (COVID-19) has plagued the world. This is unlike other coronavirus outbreaks that have occurred in the past, such as Middle East respiratory syndrome (MERS) or severe acute respiratory syndrome (SARS). COVID-19 has spread more quickly and posed special challenges due to the lack of appropriate treatments and vaccines. Real-time polymerase chain reaction (RTPCR) and rapid antibody tests (surveillance tests) are the two most used tests (confirmation tests). However, the latter takes hours to complete, and the former may produce false positives. Scientists have invested significant effort to create a COVID-19 diagnostic system that is both highly sensitive and reasonably priced. Early detection of COVID-19 is a major area of focus for sensing devices based on nanomaterials. This overview enhanced insights into potential coronavirus biomarkers and, compared to earlier studies, introduced new avenues. Further, it covers the development of COVID-19 diagnostic systems from an analytical point of view, including clinical markers and their subsequent applications with biosensors.
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