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[Cytomegalovirus antigenemia assay as a useful tool for early diagnosis and therapy for cytomegalovirus infections in three cases with collagen diseases].

We report here three cases of collagen diseases with cytomegalovirus infections. (1) A 21-year-old female, who had been diagnosed as systemic lupus erythematosus, lupus nephritis and lupus peritonitis, had fever. Cytomegalovirus antigenemia (CMV-Ag) assay was 10/8 positive. (2) A 33-year-old female, who had been diagnosed as Wegener glanulomatosis, had fever and liver dysfunction. CMV-Ag assay was 933/896 positive. (3) A 64-year-old female, who had been diagnosed as microscopic polyangitis, had fever, liver dysfunction and pneumonia. CMV-Ag assay was 6/2 positive. They were considered to be complicated with CMV infections. We could make early diagnoses of CMV infection by using CMV-Ag assay and treat them with anti-CMV therapy effectively.