Integration of Microscopic, Serologic and Molecular Techniques for Detection of Filarial Parasites in Dogs in Malaysia.

Abstract

Canine filariosis in domestic dogs caused by several species of filarids is an emerging vector-borne disease and the spread of this disease remains a global veterinary and public health concern. However, information regarding these filarids and their epidemiological patterns remains scarce in Malaysia. The present study aimed to determine the infection rate and associated risk factors of filarial parasites in dogs in Malaysia. A total of 399 dog blood samples were collected from veterinary hospitals and animal shelters in Malaysia to determine the infection rate and associated risk factors via a combination of microscopic, serologic and molecular diagnostic techniques. Two species of canine filariae identified in this study were Dirofilaria immitis (6.5%) and Brugia pahangi (1.3%), and their infections were associated with cross breed, medium size and short hair (p < 0.05). A new pair of primers was developed to complement the recovery of the 12S rRNA gene fragment of filarial parasites. This study represents the first molecular evidence of B. pahangi in dogs in Malaysia.