Coronaviruses can cause respiratory infections in humans ranging from the common cold to more serious diseases like MERS and SARS. A new coronavirus, COVID-19, was discovered in 2019 and has since spread globally. Common symptoms of COVID-19 include fever, dry cough, and fatigue, though some may experience milder symptoms. While most recover without treatment, around 20% of cases result in severe illness requiring medical help. The virus spreads mainly from person to person through respiratory droplets from coughs or sneezes. Maintaining hand hygiene and physical distancing are effective ways to protect against infection. Currently there are no proven vaccines or treatments, though research efforts are underway globally to develop them.