Coronavirus disease 2019 ( COVID-19 ) is a contagious respiratory disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a specific type of coronavirus , responsible for an ongoing pandemic . Common symptoms include fever, cough, fatigue, breathing difficulties , and loss of smell and taste . Symptoms begin one to fourteen days after exposure to the virus . While most people have mild symptoms, some people develop acute respiratory distress syndrome (ARDS) possibly precipitated by cytokine storm , multi-organ failure , septic shock , and blood clots . Longer-term damage to organs (in particular, the lungs and heart) has been observed, and there is concern about a significant number of patients who have recovered from the acute phase of the disease but continue to experience a range of effects—including severe fatigue, memory loss and other cognitive issues, low grade fever, muscle weakness, breathlessness, and other symptoms—for mon
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