求翻译：RA patients on immunosuppressive therapy are at an increased risk of developing lower respiratory tract infections, particularly if they have pre-existing lung disease. Many infectious organisms, including mycobacterium avium, mycobacterium tuberculosis, and pneumocystis jirovecii, as well as fungal pathogens can have a radiologic appearance that mimics RA-ILD with increased ground glass and interstitial infiltrates. An additional consideration is that chronic prednisone use increases the risk of hospitalization for pneumonia in RA patients in a dose-dependent fashion with doses greater than 10mg/day more than doubling the risk [38]. Another study highlighted an increased risk of pneumocystis pneumonia in patients taking as little as 15mg of prednisone per day for more than 8 weeks suggesting that the use of trimethoprim-sulfamethoxazole as prophylaxis in these patients may be beneficial [39].是什么意思？

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