Considering the etiology

pathogenesis and clinical characteristics of the coronavirus disease 2019（COVID-19）

and referring to Dr. GAO Zhongshan′s theory of combining latent pathogen and constitution to prevent and treat epidemic diseases

it is believed that COVID-19 belongs to the category of "dampness toxin epidemics" in traditional Chinese medicine

and is usually entangled with dampness

heat and stasis which make it difficult to deal with. Therefore

the "solitary pathogen" theory put forward by professor GAO is recommended in treating COVID-19

and a series of treatment regimen are provided to the severe patients with epidemic toxin blocking the lung pattern

disease of both lung and intestine pattern

blocking of orifices and stirring wind pattern. Simultaneously

Dr. GAO′s experience of diet prescriptions and its applications and contradictions are summarized to optimize the treatment strategy of COVID-19 and the diet regimen to "prevent the recurrence after convalescence"

in order to provide references for prevention and control of COVID-19 epidemics.