**2.4 Diagnosis**

Whole-genome sequencing led to finding newer genes for RT-PCR. RT-PCR test on upper and lower respiratory secretions is routinely used for diagnosis. This test should be repeated in clinically suspected cases. Gaita samples can also be positive by RT-PCR. Serology is essential for the previous infection for SARS-CoV2 and common coronaviruses. Laboratory findings may be lymphopenia, thrombocytopenia, neutropenia. In severe cases, lactate dehydrogenase, coagulation parameters, and D-dimers are elevated. C.T. (computerized tomography) findings include multiple patchy, nodular, ground-glass, or reticular opacities and infiltrations [24].
