  COVID-19 disease, caused by SARS-CoV-2, has resulted in a global pandemic
recently. With no approved vaccination or treatment, governments around the
world have issued guidance to their citizens to remain at home in efforts to
control the spread of the disease. The goal of controlling the spread of the
virus is to prevent strain on hospital. In this paper, we have focus on how
non-invasive methods are being used to detect the COVID-19 and assist
healthcare workers in caring for COVID-19 patients. Early detection of the
COVID-19 virus can allow for early isolation to prevent further spread. This
study outlines the advantages and disadvantages and a breakdown of the methods
applied in the current state-of-the-art approaches. In addition, the paper
highlights some future research directions, which are required to be explored
further to come up with innovative technologies to control this pandemic.
