Abstract
BackgroundPorcine epidemic diarrhoea (PED) is a highly contagious infectious disease with negative economic impacts on the swine industry. PED outbreaks were reported from 2009 to 2015, but sporadic infection has been observed until now in Vietnam. However, the seroprevalence of PEDV infection has not yet been reported for commercial pig farms in Vietnam. The aim of this study was to assess the seroprevalence of PEDV infection in Vietnamese pig farms to reveal the endemic status of PEDV in northern Vietnam.ResultsA serological survey of PEDV infection was carried out using indirect ELISA in commercial pig farms in Hai Duong, Hung Yen and Thai Binh provinces in northern Vietnam in 2019. Twenty sera were randomly collected from each of 10 commercial pig farms, from each province; none of the farms had vaccinated for PEDV. Serological evidence of natural PEDV infection, expressed as a high antibody titre, was observed in the pig farms in all 3 provinces. The OD values were significantly higher (p < 0.001) for pig sera from Thai Binh than from Hai Duong and Hung Yen. No significant differences (p > 0.05) were detected for seropositivity to PEDV based on locality, age, pig breed and farm size.ConclusionsThis study indicates serological evidence of natural PEDV infection with high antibody titre in commercial pig farms. PEDV infection was widespread among the pig population in these 3 provinces and that good management and strict biosecurity are needed at these pig farms.
Highlights
Porcine epidemic diarrhoea (PED) is a highly contagious infectious disease with negative economic impacts on the swine industry
Clinical survey for PED virus (PEDV) infection in northern Vietnam Only two of the 30 pig farms had active ongoing diarrhoea during sera collection; one farm was in Hung Yen and the other was in Thai Binh
The proportion of PEDV seropositivity based on locality Seropositivity to PEDV infection was detected in 9 of 10 (90 %) commercial pig farms in Hai Duong, in 10 of 10 (100 %) farms in Hung Yen and in 10 of 10 (100 %) farms in Thai Binh
Summary
Porcine epidemic diarrhoea (PED) is a highly contagious infectious disease with negative economic impacts on the swine industry. The seroprevalence of PEDV infection has not yet been reported for commercial pig farms in Vietnam. The aim of this study was to assess the seroprevalence of PEDV infection in Vietnamese pig farms to reveal the endemic status of PEDV in northern Vietnam. In Vietnam, a PED outbreak in piglets was first reported in 2009 [17] and a new variant PEDV infection occurred in 2013 [18]. The aim of the present study was to determine the seroprevalence of PEDV infection in pig farms to reveal the endemic status of PEDV in northern Vietnam by applying the developed ELISA protocol under field conditions.
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