| Summary: | The objective of this study was to evaluate the prevalence of involvement of common viral organisms <i>R. equi</i> and <i>K. pneumoniae</i> and their clinicopathological and radiological features in respiratory disease of Malaysian domestic cats. A total of 34 feline cases with acute/chronic infectious respiratory disease signs were followed prospectively to investigate respiratory disease due to <i>R. equi</i> and <i>K. pneumoniae</i> and their relationship with concurrent viral infections in disease manifestation. All sampled cats (<i>n</i> = 27) were positive for FCoV antibodies and negative for FeLV. A significantly high antibody titer for FCV in <i>n</i> = 26 cases was also noticed. A single sample of pyothorax from a 3-months-old, non-vaccinated kitten was positive for <i>R. equi</i>. Bronchopneumonia with severe infiltration of the polymorphs and mononuclear inflammatory cells were prominent features of lungs histopathology from the kitten positive for <i>R. equi</i>. <i>K. pneumoniae</i> subsp. <i>pneumoniae</i> was confirmed from tracheal swabs of two cats. Histologically, the tracheal tissues of the two cats positive for <i>K. pneumoniae</i> were normal. In diagnostic imaging, epicenter of the infectious URT disease was nasal conchae rostrally and nasal turbinates caudally, however for infectious LRT disease was bronchial tree. Conclusively, infectious respiratory disease is a complex illness in cats, predominantly for unvaccinated kittens and young adult cats, especially those kept in multi-cat household or shelter environments because of the involvement of multiple bacterial and viral organisms as primary or secondary invaders. Clinicians should not preclude feline rhodococcosis from differentials, especially in kittens with pyothorax and less than one year of age. Unlike <i>R. equi</i>, <i>K. pneumoniae</i> has the potential to colonize URT of cats which might be disseminating further to cause LRT disease.
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