If we look at the CoronaVirus subfamily, we see that they are enveloped RNA viruses which can be transmitted to human and other mammals. They can cause serious respiratory tract infections but their causes on human body is usually between mild to lethal.
As a result of analysis of respiratory samples taken from several pneumonia cases of unknown origin, the 2019 novel coronavirus (SARS-CoV-2) showed that it is indeed a novel coronavirus and needs to examine deeply.