1.2. Seroepidemiological Surveys
As a continuance of annual incidence surveys in the west shore at the Lake Naujan, serum samples were collected with the two methods that were the venous puncture and the capillary blood collection. The venous blood collection was done for 219 schoolchildren at Malabo Elementary School and the capillary blood collection were performed at San Pedro Elementary school and San Narciso Elementary Schools for the total 221 schoolchildren from grade I to grade III.
1.3. prevalence schitosomiasis japonica among schoolchildren and animal reservoirs in Oriental Mindoro
The results of epidemiological studies on the prevalences among schoolchildren and animal reservoirs in three endemic villages (San Pedro, San Narciso and Malabo) in Oriental Mindoro, Philippines, conducted in 1997 and 1998 are shown in alttached sheet. The data indicate that humans, dogs and fields rats have higher prevalence in Malabo than in San Pedro and San Narciso.
In the present survey, a total of 383 field rats were caught by village volunteers in the three barangays and sacrificed by cervical dislocation. At autopsy, the liver, mesentric and portal veins were thoroughly examined for flukes and foci due to schistosome infection, and the results obtained are as follows：
1.4. Snail survey and control in Malabo, Oriental Mindoro
Search for snails was done by the team in a boggy area located near the Malibaguhan creek (116 snails/man/hr). The boggy is about 200 meters long, and has average width of 20m.
Out of 116 snails examined 1 (0.9%) were infected with S. japonicum. Clearing followed by mollusciciding with niclosamide will be conducted soon by the teem and 7 volunteers from the barangay. The Malibaguhan creek were covered by dense grasses. Clearing operations with 2 sets of mowing machines and mollusciciding with niclosamide were done on 13, 14, 15 and 16 August. Seven temporary laborers were employed for the operations.
2. Bohol
2.1. Snail Survey
Snail surveys were conducted twice, on 10 and 11 August, at Casilion creek, Orvillo palawan and Noella palawan in Sto. Tomas, and Omaguin seepages, man-made canal and Bunaos palawan (seepage) in San Roque, and Apao palawan, Boncales boggy, and kanggabok creek in San Vicente. No Oncomelania quadrasi was found.
Clearing of vegetation will be carried out in Kanggabok creek, kanggabok tributary, Boncales boggy, Kasilion creek, Orevillo canal in San Vicente and Omaguing seepage, Omaguing pocket II, Omaguing pocket III and man-made canal in San Roque by the Bohol SCT staff with help from 6 temporary employees.
