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A systematic literature review was performed to quantify the accuracy of chest radiography in differentiating bacterial from viral lower respiratory infection in children. Relevant studies were identified in a systematic literature search and were included in the review according to predetermined criteria. Five of 13 relevant identified studies met the inclusion criteria. No clinically useful degree of accuracy was demonstrated, but great caution is needed in interpreting the findings because of the suboptimal nature of the reference standards, even in included studies. It is recommended that future surveys of the microbial etiology of pneumonia that employ a credible reference standard (such as lung aspiration) be used as opportunities to perform studies of diagnostic accuracy.
George Swingler (2000) studied this question.