- 4 (16.7%) of infections presented with lymphopenia. An additional 4 (16.7%) leukopenia.
- Abnormal levels of alanine aminotransferase, aspartate aminotransferase, creatine kinase, C-reactive protein and D-dimer were rare. 

University of Michigan - Ann Arbor

- Fever (when high temperature is measured)
- Laboratory confirmation of illness via viral testing
- Radiological lung abnormalities such as ground-glass chest and stripe shadowing


Clinical Characteristics of Asymptomatic COVID-19 Patients

Hu, Z., Song, C., Xu, C., Jin, G., Chen, Y., & Xu, X. et al. (2020). Clinical characteristics of 24 asymptomatic infections with COVID-19 screened among close contacts in Nanjing, China. Science China Life Sciences, 63(5), 706-711. https://doi.org/10.1007/s11427-020-1661-4

Clinical characteristics of 24 asymptomatic infections with COVID-19 screened among close contacts in Nanjing, China

References for Signs of COVID-19 by journal

Laboratory results showed that there were significant differences in white blood cell counts, absolute values of lymphocytes, platelets, albumin, total bilirubin, blood urea nitrogen, blood creatinine, myoglobin, cardiac troponin, C-reactive protein (CRP) and interleukin-6 (IL-6) between those who died from COVID-19 and those who survived.

Laboratory Results of COVID-19 Patients in Wuhan, China

- 12 (50.0%) of asymptomatic infections showed typical ground-glass or patchy shadows in their CT images. 
- 5 (20.8%) of asymptomatic infections showed atypical striped shadows in CT images of their lungs.
- 7 (29.2%) displayed normal CT images.

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