Distinct morphological characteristics of zoonotic canine hookworm Ancylostoma ceylanicum circulating in dog in Ha Noi city area observed under scanning electron microscope

Abstract

The prevalence of zoonositic canine hookworm (Ancylostoma ceylanicum) in the Northern provinces, Viet Nam was confirmed basing on the result of CO1 mitochondrial gene segment sequence analysis (Duong Duc Hieu et al, 2016). In this study, some distinct morphological characteristics for A.ceylanicum parasiting in dog in Ha Noi city were also described by using SEM (scanning electron microscope). In detail, the size of A. ceylanicum species was gene-rally smaller than that of A. caninum species and ranging 7.38 ± 1.44 x 0.35 ± 0.03 mm. Especially,the buccal cavity of A.ceylanicum species had two sharp pairs of teeth. In the male tail of A.ceylanicum species having the externolateral ray incurred at the same base of the mediola-teral and posteriolateral rays which were nearly paralleled with each other. That was the distinct morphological characteristics for identifying the A.ceylanicum and A.caninum species - the 2 common hookworm species were normally transmitted in dog in Ha Noi city. Besides, result of testing the dog feces indicated that the prevalence of canine hookworm infection in raising dog in Ha Noi city was very high, with 41.67% warning that the high risk of canine hookworm transmission to human in this area.