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en Molecular Investigation of Outer Membrane Channel Genes Among Multidrug Resistance Clinical Pseudomonas Aeruginosa Isolates میکروب شناسی Microbiology مقالات اصلی Original Article <div style="text-align: justify;">Background: Multidrug resistance Pseudomonas aeruginosa (MDRPA) is most important issue in healthcare setting. It can secrete many virulence effector proteins via its secretion system type (T1SS-T6SS). They are using them as conductor for delivering the effector proteins outside to begins harmful effect on host cell increasing pathogenicity, competition against other microorganism and nutrient acquisition.  Methods: The study include investigation of 50 isolates of MDRPA for transport secretion system and resistance for antibiotics. Molecular diagnosis using P. aeruginosa specific primer pairs, investigation of AprF, HasF, XcpQ, HxcQ, PscC, CdrB, CupB3, and Hcp using specific primer pairs by PCR were also performed. Results: The results revealed high resistance to beta lactam antibiotics (78% for ceftazidime, 78% for cefepime and 46% for piperacillin) can indicate possessing of isolates for beta lactamases and this confirmed by dropping resistance to piperacillin to 16% when combined with tazobactam. Also, the results shown the ability of MDRPA for pyocyanin biosynthesis using the system of genes. Conclusions: The current study conclude that all isolates of P. aeruginosa were highly virulent due to their possessing of all transport secretion system to deliver different effector proteins with possible harmful effects of these proteins.</div> Drug resistance, MDR, Efflux pump, Pseudomonas aeruginosa. 102 110 http://rbmb.net/browse.php?a_code=A-10-779-1&slc_lang=en&sid=1 Maytham Hassan Jasim Al-Thabhawee 100319475328460012354 100319475328460012354 Yes Biology Department, College of Science, University of Babylon, Iraq. Hussein Oleiwi Muttaleb Al-Dahmoshi 100319475328460012355 100319475328460012355 No Biology Department, College of Science, University of Babylon, Iraq.