What is UV light? How does it work?

Symptoms of human infection with new coronavirus ● Mainly manifested by fever, fatigue, and dry cough ● Few patients have symptoms such as nasal congestion, runny nose, sore throat, and diarrhea ● Severe patients usually have dyspnea and / or hypoxemia one week after the onset of disease, and the severe ones quickly progress to acute respiratory distress syndrome, septic shock, difficult to correct metabolic acidosis, coagulation dysfunction and multiple organ failure .