Identify the way how each of the following concepts are explained. Write definition, explication or clarification on the space before each number.
1. Coronaviruses are a large family of viruses causing a range of illnesses, from the common cold to more serious infections such as those caused by Middle East Respiratory Syndrome related Coronavirus (MERS-CoV) and Severe Acute Respiratory Syndrome-related Coronavirus (SARS-CoV). Coronavirus can also cause a variety of diseases in farm animals and domesticated pets.