Covid Testing-Detect covid 19 what testing method is used? How to get antibody testing for covid 19? What's principle for coronavirus test? Coronavirus are a large family of viruses which may cause illness in animals or humans. In humans, several coronaviruses are known to cause respiratory infections ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS). The most recently discovered coronavirus causes coronavirus disease COVID-19.