inclusion criteria: * 18 years of age, male or female; * history of covid-19 infection within 1 week; * subjects with hrct consistent with viral pneumonia (judged by investigator) and meeting any of the following criteria: with fever, respiratory symptoms; shortness of breath present,rr ≥30 breaths/min. * clear consciousness, capable and voluntary informed consent.

inclusion criteria: * 18 years of age, male or female; * history of covid-19 infection within 1 week; * subjects with hrct consistent with viral pneumonia (judged by investigator) and meeting any of the following criteria: with fever, respiratory symptoms; shortness of breath present,rr ≥30 breaths/min. * clear consciousness, capable and voluntary informed consent.

inclusion criteria: 18 years of age, male or female; history of covid-19 infection within 1 week; subjects with hrct consistent with viral pneumonia (judged by investigator) and meeting any of the following criteria: with fever, respiratory symptoms; shortness of breath present,rr ≥30 breaths/min. clear consciousness, capable and voluntary informed consent.

inclusion criteria: 18 years of age, male or female; history of covid-19 infection within 1 week; subjects with hrct consistent with viral pneumonia (judged by investigator) and meeting any of the following criteria: with fever, respiratory symptoms; shortness of breath present,rr ≥30 breaths/min. clear consciousness, capable and voluntary informed consent.