Browsing by Author "Sornmani, S"

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    Biology of the snail-killing fly, Sepedon spangleri Beaver (Diptera: Sciomyzidae). II. Ability of the larvae to kill snails of medical importance in Thailand.
    (1976-12-01) Sucharit, S; Chandavimol, Y; Sornmani, S
    S. spangleri larvae preferred five species of non-operculate snails; Gyraulus convexiusculus Hutton, Segmentina hemisphaerula Benson, Hippeutis umbilicalis Benson, Indoplanorbis exustus Larambergue, and Trochobis trochoideus Benson. They occasionally consumed the operculate snails: Melanoides tuberculata Muller, Lithoglyphopsis aperta, Hubendickia siamensis Brandt, Lacunopis munensis Brandt, Tarebia granifera, Lamarch and Viviparus sp. but were innocuous to Bithynia laevis Lea.
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    Clinical study of Mekong schistosomiasis at Khong Island, Southern Laos.
    (1976-06-01) Sornmani, S; Vivatanasesth, P; Thirachantra, S
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    Community participation in the malaria control program in Thailand: a review.
    (1992-03-01) Okanurak, K; Sornmani, S
    The focus of this paper is on community participation in the Thai Malaria Control Program. Two projects concerned are reviewed. First, the Village Voluntary Malaria Collaborator Program has been established for case detection. Second, the Village Malaria Self-Reliance Project aims at malaria prevention. Both projects have been able to get community participation at a certain level. The success of the projects depend on the community, the structures of the projects and the malaria situation in the communities.
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    Comparative horizontal starch gel isoenzyme electrophoresis of Lymnaea (Bullastra) cumingiana (Pulmonata: Lymnaeidae) and related taxa in the Indo-Pacific region.
    (1994-03-01) Monzon, R B; Thammapalerd, N; Kitikoon, V; Temcharoen, P; Sornmani, S; Viyanant, V
    Foot muscle tissue extracts from six lymnaeid species of the Indo-Pacific region [Lymnaea (Bullastra) cumingiana and L. (Radix) quadrasi from the Philippines, L. (R.) rubiginosa from Indonesia and Thailand, and L. (R.) viridis from Guam and Hong Kong] were subjected to horizontal starch gel isoenzyme electrophoresis and assayed for seven isoenzymes (AcP, AlP, CA, EST, LAP, CAT and GOT) to elucidate their taxonomic relationships. L. cumingiana exhibited banding patterns for EST, LAP and CAT uniquely different from the rest, thus supporting the hypothesis that it is a distinct species. Zymogram patterns for AlP, CA, EST and LAP attest to the close affinity between L. quadrasi and L. rubiginosa (Indonesia and Thailand). Minor differences suggest a closer relationship between the two geographical strains of L. rubiginosa than with L. quadrasi, lending support to the hypothesis that L. quadrasi is inseparable as a race or variety from the typical L. swinhoei Adams, which in turn is but a race of L. auricularia, which also encompasses L. rubiginosa. The two geographical strains of L. viridis from Guam and Hong Kong showed the greatest consistency with regards to similarity and congruence in banding patterns. Non-specific esterases (EST) were the most useful in distinguishing the six species from each other.
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    Comparative radular morphology of Lymnaea (Bullastra) cumingiana (Pulmonata: Lymnaeidae) and related taxa in the Indo-Pacific region.
    (1993-09-01) Monzon, R B; Kitikoon, V; Thammapalerd, N; Temcharoen, P; Sornmani, S; Viyanant, V
    The radular morphology of Lymnaea (Bullastra) cumingiana was compared to that of five other Indo-Pacific lymnaeid "species", namely: L. (Radix) quadrasi (Philippines), L. (R.) rubiginosa (Indonesia and Thailand) and L. (R.) viridix (Guam and Hong Kong) in order to investigate the taxonomic relationship among the six species. Although all six species uniformly exhibited a unicuspid, slightly asymmetrical central (rachidian) tooth and tricuspid laterals, interesting differences were noted among the outer marginals. These were observed to be uniquely bicuspid in L. cumingiana, predominantly tricuspid in L. quadrasi, tetracuspid in L. rubiginosa (Indonesia and Thailand) and multicuspid in L. viridis (Guam and Hong Kong). Thus, the results support the hypotheses that L. cumingiana is a unique species compared to the rest, that L. quadrasi is closely related to L. rubiginosa (Indonesia and Thailand) and that the two geographical isolates of L. viridis have not diverged. Radular morphology was therefore found to have a limited significance in elucidating the taxonomic relationship between the six groups of lymnaeids studied.
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    Comparative shell morphology of Lymnaea (Bullastra) cumingiana (Pulmonata: Lymnaeidae) and related taxa in the Indo-Pacific region.
    (1993-09-01) Monzon, R B; Kitikoon, V; Thammapalerd, N; Temcharoen, P; Sornmani, S; Viyanant, V
    Comparative shell morphology using both quantitative and qualitative parameters was employed to investigate the taxonomic relationship between the endemic Philippine species, Lymnaea (Bullastra) cumingiana and five other lymnaeid "species" in the Indo-Pacific region, namely: L. (Radix) quadrasi (Philippines). L. (Radix) rubiginosa (Indonesia), L. (Radix) rubiginosa (Thailand), L. (Radix) viridis (Guam) and L. (Radix) viridis (Hong Kong). Fifty randomly chosen adult specimens of each species were studied and compared, although only field-collected specimens were studied for the first four groups and laboratory-raised specimens for the last two group. Results strongly suggested that L. cumingiana is a distinct species among the rest. L. quadrasi, L. rubiginosa (Indonesia) and L. rubiginosa (Thailand) exhibited great affinity towards each other. Likewise, the two geographical isolates of L. viridis were practically identical to each other except for some minor size differences.
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    The cost of dengue hemorrhagic fever in Thailand.
    (1997-12-10) Okanurak, K; Sornmani, S; Indaratna, K
    The economic burden of DHF patients and of the Thai government in providing treatment and prevention and control of dengue hemorrhagic fever were assessed. Patient burden was reported by caretakers who stayed with the patients when they were admitted to three hospitals: Children's Hospital in Bangkok; Suphan Buri Provincial Hospital and Don Chedi Community Hospital, Don Chedi District in Suphan Buri Province. The hospital costs--medicine and laboratory costs--were collected from the treatment forms and the routine service cost was estimated by the staff of the hospitals. Cost of prevention and control were compiled from the budget report of Departments of the Ministry of Public Health and the Ministry of Interior. Based on 184 DHF patients admitted at the three hospitals, the direct patient costs--treatment cost and the costs of travel, food and lodging--was 66.99 US$ and 61.02 US$ per patient for one episode of DHF in Bangkok and Suphan Buri, respectively. The total patient costs--direct patient costs and opportunity costs were 118.29 US$ for a child patient and 161.49 US$ for an adult patient in Bangkok, 102.82 US$ for a child patient and 138.02 US$ for an adult patient in Suphan Buri. The net hospital cost in providing treatment for each DHF patient was 54.6 US$ and 38.65 US$ in Bangkok and Suphan Buri, respectively. The total cost of prevention and control of DHF in Thailand from government agencies in 1994 was 4.8724 million US$. Based on these findings, the whole expenditure of Thailand for DHF in 1994, would be at least 12.596 million US$, of which 54.8% was from the government budget, the rest, 45.2%, was the expenses paid by 51,688 patients and their families. The study concluded that in recording the economic-loss of DHF both the expenditures of the government and also the patient costs--direct and indirect--should be taken into account.
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    Ecological observations on Lymnaea (Bullastra) cumingiana.
    (1993-09-01) Monzon, R B; Kitikoon, V; Thammapalerd, N; Temcharoen, P; Sornmani, S; Viyanant, V
    Field surveys conducted at Echague, Isabela and San Pablo, Laguna revealed that Lymnaea (Bullastra) cumingiana, the natural second snail intermediate host of Echinostoma malayanum in the Philippines, exhibits a moderate degree of diversity in its choice of habitats. Rice fields of all stages of development, stagnant shallow streams and springs are the main areas where the snail can be collected from at Echague, Isabela. However, they were absent in rice fields that had been extensively sprayed with molluscicides to control the "golden apple snail" (Ampullarius canaliculatus). In contrast, they were also very abundant in the highly eutrophic waters of Sampaloc lake, San Pablo, Laguna. L. cumingiana co-exists with various species of insects, snails, fish and plants in these habitats. Information on ecological characteristics affecting its distribution will be useful for those who wish to collect and study this species in the future.
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    The effect of controlled release copper sulfate and tributyltin fluoride on the mortality and infectivity of Schistosoma mansoni miracidia.
    (1982-06-01) Viyanant, V; Thirachantra, S; Sornmani, S
    The experiments were conducted to assess the effect of sublethal concentration of controlled release copper sulfate (EC-8) and tribultyltin fluoride (CBL-9B) on the mortality and infectivity of Schistosoma mansoni miracidia. It was found that LC50 and LC90 of EC-8 to the miracidia were 8.5 mg/l per hr and 15.75 mg/l per hr respectively. For CBL-9B, LC50 was 19.75 microgram/l per hr and LC90 was 32.0 microgram/l per hr. Exposing of the miracidia to 0.5 mg/l of EC-8 or 4.0 microgram/l of CBL-9B respectively, for only one hour can prevent their transmission to the snail host. The results indicate that immobilization of the free living stages of the schistosome parasite was not required to interrupt their transmission to the next hosts.
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    Epidemiological study of Schistosomiasis japonica on Khong Island, southern Laos.
    (1971-09-01) Sornmani, S; Kitikoon, V; Harinasuta, C; Pathammavong, O
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    An epidemiological survey of human intestinal parasites in Vientiane, Laos.
    (1974-12-01) Sornmani, S; Pathammavong, O; Bunnag, T; Impand, P; Intrakhao, C; Thirachantra, S
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    Health and nutritional problems in the NAM Pong water resource development scheme.
    (1981-09-01) Sornmani, S; Schelp, F P; Harinasuta, C
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    Health behavior, treatment-seeking patterns, and cost of treatment for patients visiting malaria clinics in western Thailand.
    (1986-09-01) Fungladda, W; Sornmani, S
    A clinic-based case-control study was conducted at two malaria clinics in western Thailand in order to investigate social and behavioral factors believed to be associated with malaria occurrence. The finding was that the malaria cases were predominantly male, under age 25 and single. The results showed a significant association for use of mosquito nets, conformance with DDT spraying and residing in forested areas two weeks before occurrence of illness with malaria. Analysis of symptoms revealed fever, headache and chills to be the major noticeable symptoms initiating treatment. Three basic treatment-seeking patterns were observed. The results of this study suggest that particular attention should be given to malaria health education for younger age groups and forest-related people. In addition, attention should also be given to ways of increasing awareness of symptoms, and motivation of people to use malaria clinics for malaria screening and treatment at onset of first symptoms in order to eliminate treatment-seeking at ineffective first sources. Malaria Voluntary Collaborators, Village Health Volunteers and Village Health Communicators have an important role in convincing people in malarious areas to use malaria clinics for malaria screening and treatment when the villagers develop malaria-like symptoms. This would reduce disease transmission and severity by reducing the delay for efficacious treatment and would also reduce the cost of malaria treatment.
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    Investigation on immunity induced by Schistosoma spindale against S. mekongi in experimental mice.
    (1988-03-01) Janecharut, T; Kitikoon, V; Usawattanakul, W; Sornmani, S
    An investigation on immunity induced by Schistosoma spindale cercariae (cattle and swamp buffalo schistosome) against S. mekongi (human schistosome) was conducted in Swiss albino mice. The studies comprised the development patterns of homologous immunity of S. spindale and heterologous immunity induced by S. spindale against S. mekongi. The development pattern of homologous immunity was studied in mice with an immunization of 100 S. spindale cercariae. At one week intervals, between 2 to 16 weeks after immunization, they were each challenged with 500 S. spindale cercariae. Significant homologous immunity, as judged by lung recovery assay five days after challenge, occurred from week 5 to week 16 with week 8 giving the highest homologous immunity (68.1% of schistosomular reduction). Using the above information mice, with an eight-week immunization period of 100 S. spindale cercariae, were tested for resistance to heterologous S. mekongi infection. The criteria used to evaluate their immune status was schistosomular lung recovery, daily egg output, worm recovery and tissue egg count. The results showed that mice immunized with S. spindale cercariae could develop heterologous immunity against S. mekongi infection. Manifestation of immunity was demonstrated by significant reduction in mean schistosomular recovery (31.4%), in mean daily egg output per female worm (16.7%), in mean worm recovery (64.2%) and in mean egg deposition in the liver tissue and intestines per female worm (37.05%).
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    Life cycle of Schistosoma japonicum-like trematode from Khong Island Southern Laos.
    (1973-06-01) Sornmani, S; Schneider, C R; Kitikoon, V