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Avian oncogenic or tumor diseases are common in poultry industry causing significant economic loss. Marek’s disease (MD), avian leukosis (AL) and Reticuloendotheliosis (RE) are the three major viral oncogenic infections that are difficult to differentiate with gross lesions. Multiplex PCR for simultaneous detection and differentiation of these three viruses was developed and validated. The primers targeting the genes of  pp38 ,  pol  and  LTR  for MDV, ALV and REV were designed to yield 206, 429, and 128 bp, respectively. The sensitivity of the PCR primers was checked with serial dilution of positive template DNA for each virus and found to be in the range of 10 −5  to 10 −7  of 1 µg/µl of initial template DNA. Out of 114 suspected tumor samples screened, 8 samples were positive for MDV, 13 samples were positive for ALV and 31 samples positive for REV. Five samples were positive for both MD and ALV; 3 samples were positive for MD and REV and 25 samples were positive for ALV and REV. Eight samples were positive for all three viruses. Multiplex PCR demonstrated to be a useful technique for simultaneous, rapid detection and differentiation of major tumor causing and immunosuppressive viral diseases of chicken.

Simultaneous detection and differentiation of three oncogenic viral diseases of chicken by use of multiplex PCR