Short-term Bactericidal Effect of Contezolid in MAC-PD

The goal of this clinical trial is to learn if contezolid works to treat mycobacterium avium complex pulmonary disease in adults. It will also learn about the safety of contezolid. The main questions it aims to answer are: Does adding contezolid to standard regimen further decrease the bacterial load in patients' sputum compared with current standard regimen? What medical problems do participants have when taking contezolid along with standard regimen? Researchers will compare standard regimen plus contezolid to standard regimen alone to see if contezolid helps further lower the count of bacteria in patients' sputum. Participants will: Take contezolid and standard regimen (azithromycin, ethambutol and rifampicin) or standard regimen only for 6 months, contezolid is administered every day while other drugs are taken 3 times a week Visit the clinic once every 1 month for checkups and tests.