Contact with patients with novel coronavirus is not necessarily infectious, the RO value of the transmission of novel coronavirus is 3.7-4.3, and not all people who contact the patient will be infected, whether the infection depends on three factors: 1, the number of pathogens carried by the patient, the strength of the virulence, the patient if the king of the virus is infectious to others is more likely. 2, the depth of contact, the contact established the transmission route, but The number of contacts is small, not eating and living together, and contact with the patient’s respiratory secretions, not many items are relatively small chance of infection. On the contrary, close contact or even taking care of the patient’s living time is much greater chance of infection. 3, the strength of the contact organism’s resistance to disease, young and strong people are relatively resistant to disease, the elderly and people with underlying diseases are weak, but fatigue, fatigue, staying up late, changing the routine and rest time will reduce the body’s resistance to disease, so during the epidemic to eat well, sleep well, maintain the original habits and routine, so as to maintain good resistance to disease. thus maintaining a good resistance to disease.