Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 8 5-6 2019 09 12 69 72 Sarika kombade Department of Microbiology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India. Jitu Kalita Department of Microbiology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India. Vijaya Nag Department of Microbiology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India. Kavita Yedale Department of Microbiology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India. Anuradha Sharma Department of Microbiology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India. 2019 03 13 Background: Acinetobacter species are the major cause of nosocomial infection especially in intensive care unit settings. This organism also gains its importance for its nature of showing resistance towards various classes of antibiotics. Methods: Conventional biochemical test and Microscan walkway automated system was used for identification of the isolate. Results: Here, we report an unusual finding of multidrug resistant Acinetobacter baumanii, isolated from cerebrospinal fluid due to the post antibiotics effect. Conclusion: Microbiologist should be vigilant while reporting the unusual morphology of bacteria as antibiotic pressure effect may change the morphology and important findings may miss by microbiologist so antibiotic history should evaluated. https://jmb.tums.ac.ir/index.php/jmb/article/view/414 https://jmb.tums.ac.ir/index.php/jmb/article/download/414/303