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Am. J. Respir. Crit. Care Med., Vol 154, No. 6, 12 1996, 1784-1787.

Relationship between microbiologic and histologic features in bacterial pneumonia

CH Marquette, F Wallet, MC Copin, D Wermert, A Desmidt, P Ramon, R Courcol and AB Tonnel
Department de Pneumologie, Hopital A. Calmette, CHRU de Lille, France.

To investigate the relationship between the lung damage resulting from pneumonia and the local bacterial burden, we conducted a study comparing histologic and bacteriologic findings in pigs infected with bacterial pneumonia while free of antibiotic therapy and previous or concomitant lung disease. Seventy-eight lung specimens were obtained from 17 animals. The main findings are the following: (1) histologic lesions of pneumonia as well as parenchymal bacterial burden were unevenly distributed within the lungs and even within the lung segments; (2) specimens showing histologic evidence of pneumonia had significantly higher bacterial counts than specimens with bronchial infection and specimens with neither bronchial nor lung infection; (3) there was no significant difference in bacterial counts between lesions defined as pneumonia, confluent pneumonia and abscessed pneumonia; (4) we could not define a clearcut threshold for quantitative cultures to discriminate the presence or absence of pneumonia. This study providing experimental insights into the relationship between microbiologic and histologic features in bacterial pneumonia confirms previous findings in humans. Although, for investigational purpose, lung cultures can be helpful in determining the bacterial etiology of pneumonia, these data do not support the use of quantitative cultures for establishing a definite diagnosis of pneumonia.


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