Coronaviruses are a group of viruses in the Coronaviridae family, which infect animals and humans. Human viruses can cause a mild illness similar to the common cold, while others cause more severe illnesses (such as MERS - Middle East Respiratory Syndrome and SARS - Severe Acute Respiratory Syndrome). A new one that had never before been known to mankind. Wuhan, China in December 2019. Signs and symptoms include respiratory symptoms and include fever, cough and difficulty breathing. In more severe cases, the infection can cause pneumonia, severe respiratory disease and sometimes death.