The certainties of this coronavirus infection are it is a new coronavirus with human-to-human transmission. The genome varies up to 12% compared to the original bat coronavirus, <1% of healthy people die from the disease. The antibodies of the healed subjects neutralize the virus also for the other infected. Those who have had the virus perhaps without their knowledge because it is asymptomatic and have overcome it by treating it as a normal flu or even pneumonia, preserve its memory through specific antibodies and are protected. He cannot infect anyone after being healed. For relapses, the subjects are immunodeficient, they did not produce the antibodies or they are infected by a different or modified virus. The symptomatology of this coronavirus respiratory syndrome is considered moderate for the majority of cases as a simple cold, which can however deepen in the pulmonary bronchus and give "mild" pneumonia, according to the Chinese Center for Disease Control and Prevention , statement made at the end of February after the observation of about 90 thousand cases. 14% of confirmed cases became severe with serious pneumonia and dyspnoea. Another 5% of the patients had pulmonary collapse, septic shock and deficiency of several organs and correspond to the critical cases that led to the exit (2.3% of the total). The coronavirus that travels regularly in winter cause symptoms mostly colds. The cases infected by this new COVID-19 develop severe forms only if there are previous diseases and in the elderly. Less than 1% of healthy subjects died of this new SARS, while cardio patients were 10.5%, diabetics 7.3% and patients with chronic respiratory diseases, hypertension or cancer 6%.