Low dose methotrexate has been used effectively for various rheumatic and non-rheumatic diseases. Three cases of Pneumocystis carinii pneumonia occurring during treatment of rheumatoid arthritis with low dose methotrexate are presented. Several mechanisms might contribute to impaired immunity and the rare development of opportunist lung infection with methotrexate. A high degree of suspicion may result in earlier diagnosis and treatment.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC463037 | PMC |
| http://dx.doi.org/10.1136/thx.46.3.205 | DOI Listing |
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