Compared with the fourth edition, the new diagnosis and treatment plan has changed greatly in the expression of the epidemiological characteristics of the new coronavirus. Among them, in terms of infectious sources, the fifth edition of the diagnosis and treatment plan mentioned for the first time that asymptomatic infected people may also become infectious sources.
In terms of transmission channels, the fourth edition of the diagnosis and treatment plan states that the transmission through respiratory droplets is the main transmission channel, which can also be transmitted through contact. The fifth edition of the diagnosis and treatment plan is revised as follows: respiratory droplets and contact transmission are the main routes of transmission. The transmission routes of aerosol and digestive tract are yet to be determined.
In terms of susceptible population, the fifth edition of the treatment plan mentions that the population is generally susceptible. And the fourth version of the diagnosis and treatment program is expressed as people are generally susceptible.. The elderly and those with basic diseases are seriously ill after infection, and children and infants are also ill. .
According to the national health and Health Commission, among the close contacts of sporadic cases, we have observed that there may be asymptomatic infections. Although there are no symptoms, the nucleic acid test is positive.