inclusion criteria: * participants will be the patients aged 18-65 years old who have been previously diagnosed to be infected with covid-19 and discharged from local hospitals after treatment with western medicines, and with negative results from covid-19 virus detection. the subjects will be evaluated for potential pulmonary fibrosis and those who present with the condition resulting from covid-19 infection will be included.

inclusion criteria: * participants will be the patients aged 18-65 years old who have been previously diagnosed to be infected with covid-19 and discharged from local hospitals after treatment with western medicines, and with negative results from covid-19 virus detection. the subjects will be evaluated for potential pulmonary fibrosis and those who present with the condition resulting from covid-19 infection will be included.

inclusion criteria: - participants will be the patients aged 18-65 years old who have been previously diagnosed to be infected with covid-19 and discharged from local hospitals after treatment with western medicines, and with negative results from covid-19 virus detection. the subjects will be evaluated for potential pulmonary fibrosis and those who present with the condition resulting from covid-19 infection will be included.

inclusion criteria: - participants will be the patients aged 18-65 years old who have been previously diagnosed to be infected with covid-19 and discharged from local hospitals after treatment with western medicines, and with negative results from covid-19 virus detection. the subjects will be evaluated for potential pulmonary fibrosis and those who present with the condition resulting from covid-19 infection will be included.