The study was conducted from October, 2009 to January, 2010 to identify the bacteria involved and
histopathological changes in pneumonic lungs of small ruminants slaughtered in Gondar town and
Elforaabattoir. A total of 72 pneumonic lungs and 24 tracheal swabs of small ruminants were examinedfor
histopathologicalchanges and bacteriological isolations. Bacteria isolated from trachea were Pastuerella species
(48.28%), Staphylococcus species (17.24%), Streptococcus species (13.79%) and others bacteria (20.69%).
Pasturela species was the predominant organism isolated from swab of pneumonic lung followed by
Staphylococcus and Streptococcus. Histopathologicalexamination the respective prevalence of
bronchopneumonia, interstitial pneumonia and combination of two were 56.93%, 23.61% and 16.67%
respectively. This study showed that past. Species, Staphylococcus and Streptococcus species were the most
important bacteria involving in inducing pneumonia in small ruminants. In addition the study observed here
suggests that other etiology also have a considerable effect on the occurrence of pneumonia in small ruminants.