Epidemiological, clinical pathological characteristics and gross lesion of Derzsy’s disease in ducks caused by Parvovirus in some northern provinces of Viet Nam

Abstract

Derzsy’s disease in duck is one of the acute infectious diseases, caused by Parvovirus, leading to high infection and mortality rates, and heavy economic loss in the duck production. This study aimed to determine some epidemiological, clinical, pathological characteristics and gross lesions
of the Derzsy’s infection ducks. The studied results demonstrated that from 96 sick duck samples collecting in 4 provinces Bac Ninh, Bac Giang, Ha Noi and Thai Nguyen; there were 51 positive samples (53.13%) determined by Polymerase chain reaction (PCR) method. The average infection and mortality rates of the Derzsy’s infection ducks were 32.60% and 71.57%, respectively, and different among the above investigation provinces. The ducks raised in Bac Ninh province showed the highest infection and mortality rates. The infection and mortality rates of the Derzsy’s infection ducks were the highest at the age of 2-3 weeks old and decreased from the age of 4-5 weeks old. The different seasons effected to the infection and mortality rate, the highest infection and mortality rates (37.08 and 84.27%, respectively) were in the summer. The ducks raised in household farms showed the highest infection and mortality rates (36.25 and 87.93%, respectively). The main clinic signs of the Derzsy’s infection ducks included: short beak, dwarfism, anorexia, uropygial glands and swollen eyelids. The main gross lesions in the Derzsy’s infection ducks consisted of fibrinous pseudomembrane tongue and oral cavity , swelled liver, spleen, kidney, pulmone oedema and haemorrhagic intestines.