Coronaviruses are a large family of viruses that can cause illness in humans and animals. Some coronaviruses that infect animals can spread to humans and then spread between people, such as MERS, SARS, and COVID-19. COVID-19 spreads through respiratory droplets from infected individuals when they cough or sneeze and can spread between people within 6 feet of each other. Common symptoms include fever, cough, and shortness of breath.