Isolation of Pathogenic Bacteria from the Nasopharynx of Children with Respiratory Syncytial Virus Infection: Predictive Value of Chest Roentgen Examination and Laboratory Tests

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Abstract
Potentially pathogenic bacteria were isolated from the nasopharynx in 33/66 hospitalized infants and children with verified respiratory syncytial virus (RSV) infection. The value of chest roentgenograms and blood counts for the prediction of concomitant bacterial infection was evaluated. Abnormal chest roentgenograms were found in 89 % whether pathogenic bacteria were present or not. The most common finding was general hyperinflation of the lungs, with or without infiltrates. This occurred more frequently in the group with isolated RSV infection. Fever, leucocytosis and an elevated ESR were found during the illness in more than half the cases. These findings were more frequent in children who harboured potential pathogenic bacteria, though the difference was not significant. For optimal evaluation of a case all available information about it should be taken into consideration.