Riemerella anatipestifer is a Gram-negative, cocco-bacillary, non-motile, bipolar, nonsporulating bacterium, belong to the family Weeksellaceae and order Flavobacteriales. The bacterium causes the great economic losses in duck farming areas every year due to miss identification with other co-infection. Therefore, a study was designed to detect R. anatipestifer at molecular level through polymerase chain reaction (PCR) from ducks of Mymensingh division and Sylhet division and to determine the antibiogram profile of the PCR positive isolates using disc diffusion method. A total of 52 samples were collected, comprising clinically sick (32) and dead ducks (20). PCR confirmation was accomplished and consistent findings were observed, employing R. anatipestifer specific PCR assay (546 bp), gyrB-based PCR (162 bp), as well as groEL (271 bp) gene as appropriate molecular markers. A total 21 samples, 8 from clinically sick birds and 13 from dead showed the positive results both conventional and at molecular assay out of 52 samples. The oropharyngeal swab from sick ducks, liver and heart from dead ducks revealed high prevalence rate of positive isolates. Antibiotic susceptibility test revealed that the isolates were 100% resistant against Beta-lactams (Penicillin G, Cephradin), Aminoglycosides (Streptomycin, Neomycin, and Gentamycin), Penems (Meropenem), and Macrolids (Erythromycin), however, 100% sensitive to Sulphonamides (Cotrimoxazol), Phenicols (Florfenicol), and Quinolones (Levofloxacin).