author(s)
S Krishna Kumar, M Sivakumar, P Selvaraj, S Yogeshpriya and M Veeraselvam

abstract
Nomadics depends on livestock and poultry for their livelihood. Duck keeping is common among nomadics in delta districts of Tamil Nadu. This research was carried in a duck flock having a history of in appetence, polydipsia, star grazing and inconsistent mortality of about 8-10 birds in a day. The clinical samples were collected and subjected to bacteriological examination and molecular diagnosis. This flock showed positive for Duck viral enteritis and E. coli infections. This research found that the epidemiological risk factor for the inconsistent mortality was possibly due to chronically infected and partially immune birds in flock.