- 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

"a sign is any objective evidence of a disease that can be observed by others (for example a skin rash or lump)."

University of Michigan - Ann Arbor

In infectious disease epidemiology, an agent is an infectious organism or pathogen, such as a virus, bacterium, paraiste, etc. that can cause disease. 
Some factors that can influence an agent's ability to cause disease include: pathogenicity, virulence, addictive qualities, infectivity, ability to survive outside body, susceptibility to antibiotics, etc. 


Agent/Pathogen

Miller, L., Bhattacharyya, R., Miller, V., Gupta, A., Gahlot, N., & Elhence, P. et al. (2020). Signs and symptoms - Latest research and news | Nature. Retrieved 23 April 2020, from https://www.nature.com/subjects/signs-and-symptoms

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