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Quantitative analysis of Salmonella Enteritidis loads in ducklings after nasal inoculation

S. X. Deng^*,, A. C. Cheng^*,1, M. S. Wang^* and L. G. Ye

^* Avian Diseases Research Center, College of Veterinary Medicine of Sichuan Agricultural University, Yaan, Sichuan Province, 625014, China; and Agricultural Office of Dalingshan Town, Dongguan, Guandong Province, 523820, China

¹ Corresponding author: chenganchun{at}vip.163.com

The distribution patterns of Salmonella Enteritidis in systemic organs, which have not been described previously, should be studied to better understand its pathogenesis in vivo. We inoculated the ducklings with Salmonella Enteritidis via the nasal route and performed a real-time PCR assay for determining the concentration of Salmonella Enteritidis DNA and studied the histopathology of various tissues postinoculation. The results show that the Salmonella Enteritidis load in systemic organs has a close correlation with the progression of disease. Further, rapid dissemination and active replication of Salmonella Enteritidis in multiple systemic organs accelerated the progression of disease.

Key Words: Salmonella Enteritidis • quantification • pathogenesis • duckling