1.novel coronavirus 2.coronavirus 3.pneumonia caused by the novel coronavirus/the novel corona virus - caused pneumonia 4.comfired cases 5.suspected cases 6.patients in critical condition 7.fatality rate 8.close contacts 9.be under medical observation 10.quarantine 11.incubation period 12.human-to-human transmission 13.droplet transmission 14.fever, cough and difficulty in breathing 15.secondary infection cases 16. epidemic prevention and control 17.(face)mask 18.protective clothing/suits 19.goggles 20disposable gloves 21.medical supplies 22.vaccine 23.the lockdown of a city/a city is on lockdown 24.first -level public health emergency response 25.National Health Commission(NHC)