Atypical pneumonia in an immunocompromised host

Pneumonia is a common complication of patient with lung cancer. Various Pathogens have been reported to cause pneumonia in such patients, commonly involved organisms include bacteria (e.g. S. pneumoniae, Klebsiella spp., P. aeruginosa, S. aureus), virus (e.g. CMV, varicella zoster virus, respiratory syncytial virus, parainfluenza and influenza viruses), fungi (e.g. histoplasmosis, cryptococcosis, pneumocystosis, Aspergillosis), opportunistic infections (e.g. Aspergillus, Pneumocystis jiroveci) and this list is progressively growing. Here authors are going to discuss a rare case of 61-year-old male patient of lung cancer suffering from pneumonia caused by Chryseobacterium gleum, Stenotrophomonas maltophilia and Actinomyces naeslundii and its management. Since these organisms are rarely known to cause pneumonia, so whenever we encounter such patients while authors consider common pathogens, authors should also keep in mind rare organisms especially when the pt fail to respond standard treatment