en عمومى General پژوهشي Original article <div><strong>Background and Aims:</strong> The BK virus a member of the Polyomaviruses family was first isolated from the urine of the kidney recipient. Infection with this virus and infection usually occurs in childhood [5-9 years] but most of the time [90%] of sera are positive and without symptoms. Polyomaviruses including the BK virus have also been suggested to be a contributing factor to some cancers in humans such as brain tumors, bone tumors, Kaposi&rsquo;s sarcoma, adrenal tumors, renal carcinoma, prostate cancer, urinary tumors, genital tumors etc. However, the topic still remains controversial.<br> <strong>Materials and Methods:</strong> In this study, we report the presence of BK specific DNA sequences in bladder cancer by PCR and Nested PCR methods.<br> <strong>Results:</strong> Our study results confirmed the presence of BK in 13.7% of the samples by Nested PCR method.<br> <strong>Conclusion: </strong>In conclusion, 51 samples 13.7% of paraffin-embedded bladder cancer sample were confirmed by Nested PCR method.<br> &nbsp;<br> &nbsp;</div> Seroprevalence, Infectious Laryngotracheitis, Broiler, Iran, ELISA 6 11 http://journal.isv.org.ir/browse.php?a_code=A-10-240-1&slc_lang=en&sid=1 Taban Javadzahed Javadzadeht961@mums.ac.ir 10031947532846007088 10031947532846007088 Yes Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran Masoumeh Gharib 10031947532846007089 10031947532846007089 No Department of Pathology, Faculty of Medicine, Mashhad University of Medical Sciences Majid Khadem-Rezaiyan 10031947532846007090 10031947532846007090 No Clinical Research Development Unit, Mashhad University of Medical Sciences Zahra Meshkat 10031947532846007091 10031947532846007091 No Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran Saeed Amel-Jamehdar 10031947532846007092 10031947532846007092 No Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran Mahmoud-Reza Kalantari 10031947532846007093 10031947532846007093 No Department of Pathology, Faculty of Medicine, Mashhad University of Medical Sciences Hasan Jahanbakhsh-kotlar 10031947532846007094 10031947532846007094 No Faculty of Medicine, Mashhad University of Medical Sciences Tahmine Bakhshi 10031947532846007095 10031947532846007095 No Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran Masoud Youssefi 10031947532846007096 10031947532846007096 No Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran