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Dogs have been bred since ancient times for companionship, hunting, protection, shepherding and other human activities. Some canine helminth parasites can cause significant clinical diseases in humans as  Opisthorchis viverrini  causing cholangiocarcinoma in Southeast Asian Countries. In this study, socio-cultural questionnaire, canine parasitological analysis, necropsy, parasite molecular confirmation and dog roaming data were evaluated in Savannakhet, Lao-PDR, a typical Mekong Basin area. Dog owners comprised 48.8% of the studied population, with 61.2% owning one dog, 25.1% 2 dogs, 8.5% 3 dogs and 1.8% owning more than 4 dogs. Data from GPS logger attached to dogs showed they walked from 1.4 to 13.3 km per day, covering an area of 3356.38m 2  average, with a routine of accessing water sources. Thirteen zoonotic helminth species were observed. Causative agents of visceral and cutaneous larva migrans occurred in 44.1% and 70% of the samples respectively.  Spirometra erinaceieuropaei  was detected in 44.1% of samples. Importantly,  O. viverrini  was found in 8.8% of samples. Besides the known importance of dogs in the transmission of  Ancylostoma  spp.,  Toxocara  spp. and  S. erinaceieuropaei , the observed roaming pattern of dogs confirmed it as an important host perpetuating  O. viverrini  in endemic areas; their routine access to waterbodies may spread  O. viverrini  eggs in a favorable environment for the fluke development, facilitating the infection of fishes, and consequently infecting humans living in the same ecosystem. Therefore, parasitic NTDs control programs in humans should be done in parallel with parasite control in animals, especially dogs, in the Mekong River basin area.

The role of domestic dogs in the transmission of zoonotic helminthes in a rural area of Mekong river basin