Dear Editor . The convalescent patients with COVID-19 have manifested particularly noticeable pulmonary diffusing capacity impairment (PDCI) Studies have showed that long-term sequelae from COVID-19 may affect human respiratory system, cardiovascular system, nervous system, immune system etc. with a negative impact on the patients’ mental health, well-being and quality of life, but the lungs are the organ most likely to sustain serious impairment from COVID-19 , .
