Received: 23-03-2015 / Accepted: 19-06-2015
An epidemiological study on 3,600 pigs in three districs,Vo Nhai, Phu Luong and Dong Hy,of Thai Nguyen province was carried out from 2010 to 2013. Five species of nematode were detectedin the intestines of pigs. viz.: Gnathostoma doloresi, Ascaris suum, Trichocephalus suis, Strongyloides ransomi andOesophagostomum dentatum.The overall prevalence of gastrointestinal nematodes infections was 68.16%with 82.75% beingfound in pigs from 3 to 6 months of age, followed by pigs over 6 months old (72.25%) and lowest in less than 2 month-oldpigs (49.50%). The prevalence was found highest in mountainousarea (75.50%). The prevalence in summer-autum and winter-spring were 72.00% and 64.33%, respecvely. The highest prevalence was found in free - roaming pigs (96.25%) and the lowest in pigs kept inpens (30.75%).
