We observed a case believed the peroral infection with the 151 worms of Anchylostoma duodenale. The results are as follow. 1. According to the distribution of Anchylostoma duodenale and Necator americanus, the probability of the both hookworm infections showed almost same percentage in this area. Inspite of the above situation, we observed the case, which could be clearly denied any chances of percutaneous infection, and which was a simple infection of Anchylostoma duodenale. The above facts may show that there are the biological differences on the infection ways of both Anchyolstoma duodenale and Necator americanus and the main infection way of the former is peroral and of the latter is percutaneous. 2. There are many reports on the mixed infection of both Anchyolstoma duodenale and Necator americanus, but almost no cases of Wakana Disease in this area including Southern Kyushu. But the case we observed showed having the possible history of Wakana Disease. We hereby, think the necessity observing more about Wakana Disease epidemiologically. 3. The treatment of raw vesitable juice being highly appriciated at the present time should be reinvestigated for the preventive purpose of not only Ascaris infections but also Anchylostoma infections.