Further Investigations on Natural and Experimental Hosts of Larvae of Gnathostoma Spinigerum in Thailand


Fifteen additional species of animals collected from central and northeastern Thailand were found naturally infected with the third-stage (infective) larvae of Gnathostoma spinigerum, bringing the total to 36 known species of natural second intermediate hosts, of which fresh-water fishes (Ophicephalus and Clarias), the domestic duck and the domestic chicken probably constitute the more important sources of infection in man. Experimental infections suggest 20 species of animals as potential second intermediate hosts even though not all have been found naturally infected. Infective larvae were usually first located in the liver, later in the muscles. The hamster, Norway rat, white rat, white mouse, guinea pig, domestic chicken and domestic duck are susceptible to the infection and can be used effectively as laboratory hosts.