Anatomopathological characterization of pneumonia in guinea pigs caused by Streptococcus pneumoniae in intensive breeding

Caracterización anatomopatológica de neumonías en cuyes producidas por Streptococcus pneumoniae en crianza intensiva

Objective. Characterize macroscopically and microscopically the lesions caused by Streptococcus pneumoniae in samples of guinea pig lung (Cavia porcellus) of intensive breeding in Lima. Materials and methods. The necropsy of 138 guinea pigs with clinical signs of pneumonia was performed, and the sample of the affected lungs was taken. Bacterial isolation was performed for the identification of Streptococcus pneumoniae, using blood agar and biochemical tests; Histopathological processing was performed using the hematoxylin eosin (HE) staining of tissue samples preserved in 10% formalin. Results. Of the total lungs diagnosed with pneumonia at necropsy, 17.4% (24/138) was positive for Streptococcus pneumoniae. Of these, 75% (18/24) showed macroscopic characteristics of interstitial pneumonia / broncointerstitial pneumonia and 25% (6/24) macroscopic characteristics of bronchopneumonia. In the microscopic evaluation, it was found that 37.5% presented both for interstitial pneumonia and broncointerstitial pneumonia, and 25% of them correspond to bronchopneumonia. Conclusion. Interstitial pneumonia, broncointerstitial pneumonia and bronchopneumonia with a diagnosis of Streptococcus pneumoniae are lesion patterns found in intensive breeding systems in Lima.

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