Abstract
Persistence of pneumococcal capsular antigens (PCA) in sputum was studied by counterimmunoelectrophoresis (CIE) in 36 cases of pneumococcal pneumonia. Antigens were still detected 24 and 48 h after start of antimicrobial treatment, in 92% and 76% respectively of the patients with lobar or multilobar infiltrates. Persistence of PCA was associated with radiologic extension of lung infiltrate. CIE appears to be a valuable diagnostic tool for pneumococcal pneumonia, when treatment has been instituted before admission to the hospital.
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