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Intestinal and blood parasites in the North Lore District, Central Sulawesi, Indonesia.

Over 1,000 stool specimens from residents of the Napu and Besoa Valleys, Central Sulawesi, Indonesia were examined. Schistosoma japonicum was detected in 31% of Napu Valley residents while in only 2% of the Besoa Valley residents. Hookworm infections were the most frequently encountered helminth parasitisms in both valleys. Other helminth parasites encountered were: Ascaris lumbricoides, Trichuris trichiura, Enterobius vermicularis, Strongyloides stercoralis, Physaloptera sp., Diphyllobothrium sp., echinostome and heterophyid trematodes. Intestinal protozoa endemic to the area were: Entamoeba histolytica, E. coli, E. hartmanni, Iodamoebe bütschlii, Giardia lamblia, Chilomastix mesnili and Trichomonas hominis. Plasmodium falciparum was responsible for malaria parasitaemias in 5% of 1353 specimens examined and Brugia malayi microfilaraemias were detected in 10% of 972 specimens examined.

Adolescent

Human parasitoses of the Malili area, South Sulawesi (Celebes) province, Indonesia.

A biomedical survey was conducted in 9 villages in the Malili area of South Sulawesi, Indonesia. Blood specimens were examined for malaria and microfilariae; stool specimens were examined for intestinal parasites. Malaria parasitemias were rare; Plasmodium falciparum was detected in 10 and P. vivax in 11 of 985 blood smears. Malayan filariasis was endemic to all villages surveyed. The overall prevalence of detectable microfilaremias was 15%, varying from 34% in Kawata to 1% in Nuha. Microfilarial densities, expressed as MfD50 averaged 8.0 and varied from 1.1 in Timampu to 16.0 in Karabbe. Intestinal parasites were common. Although Schistosoma japonicum was not found, 97% of the examined had one or more intestinal parasites as follows: Ascaris lumbricoides (74%), Trichuris trichiura (65%), hookworm (62%), Entamoeba coli (38%), Endolimax nana (10%), Entamoeba histolytica (6%), Iodamoeba bütschlii (4%), Entamoeba hartmanni (3%), Giardia lamblia (2%) Chilomastix mesnili (1%) and Enterobius vermicularis (1%). Strongyloides stercoralis larvae and Hymenolepis nana eggs were detected once each and heterophyid-like eggs were detected twice.

Adolescent

A controlled field trial of plain and aluminium hydroxide-adsorbed cholera vaccines in Surabaya, Indonesia, during 1973--75.

A controlled field trial comparing the effectiveness of a plain cholera vaccine with that of a vaccine adsorbed to aluminium hydroxide was carried out in a cholera-endemic area of Indonesia during 1973-75. Tetanus toxoid adsorbed to aluminium phosphate was used as the control. In vaccinees aged 1-4 years, the adsorbed cholera vaccine provided about 88% protection for 6 months following vaccination and still provided about 50% protection between 11 and 14 months after vaccination. In the same age group, the plain vaccine provided only 53% protection during the first 6 months and no appreciable protection beyond that period. In those aged 5 years and over, both vaccines provided 50-60% protection throughout the period of observation (14 months). Neither vaccine caused any serious side effects.

Adjuvants, Immunologic

Distribution and prevalence of cases of microfilaraemia in Indonesia.

Blood smear surveys were conducted in principal villages on the major islands of Indonesia to determine the microfilarial rates presently existing in the populations. A total of 163,454 persons were examined and 10.8 percent found positive for microfilariae of Wuchereria bancrofti, Brugia malayi or Brugia timori. The highest prevalence rates were found in Nusatenggara-Maluku-Irian Jaya (15.5%) followed by Sulawesi (13.7%) Kalimantan (10.8%) Sumatera (8.9%) and Jawa and Bali (1.7%). Many areas endemic for filariasis are used for the settlement of transmigrants from non-filarial endemic areas. Control program must therefore be implemented to prevent filarial infections in these new susceptible population groups.

Adolescent

Virological surveillance for dengue haemorrhagic fever in Indonesia using the mosquito inoculation technique.

A dengue haemorrhagic fever surveillance system in Indonesia, based on virological and clinical observations, is described. The system uses the mosquito inoculation technique for virus isolation and is simple, economical, and well suited for endemic areas where support and facilities are limited. The data suggest that with good cooperation between the hospital and the virology laboratory, new serotypes and possibly even new strains of virus can be identified before the onset of epidemic activity. This type of virological surveillance may make it possible to prevent major epidemics in the future.

Culicidae

Epidemic dengue hemorrhagic fever in rural Indonesia. I. Virological and epidemiological studies.

Virological studies were carried out during an epidemic of dengue hemorrhagic fever in Central Java, Indonesia in 1976. Dengue virus was isolated from the acute sera of 45 of 69 patients (65%). The isolation rate was higher in primary than secondary cases. Dengue 3 was the predominant serotype being transmitted (27 isolates), but both dengue 1 (8 isolates) and dengue 4 (10 isolates) were also being transmitted. A composite picture of magnitude and duration of viremia showed that many patients were circulating over 10(8) MID50 per milliliter dengue 3 virus for the first 3 days of illness and that viremia persisted for 5-6 days in some persons. If all shock cases were considered, there was no relationship between dengue serotype and severity of disease. All three confirmed fatal cases, however, were associated with dengue type 3 infections.

Antibodies, Viral

Epidemic dengue hemorrhagic fever in rural Indonesia. II. Clinical studies.

Clinical observations were made on 95 serologically or virologically confirmed dengue fever cases during an epidemic in a rural area of Indonesia in December 1976. The age distribution was similar to that observed in patients with dengue hemorrhagic fever in Jakarta, a highly endemic urban area. The observed disease ranged in severity from undifferentiated fever to shock and death. The majority of patients had acute onset of fever with nausea, vomiting, headache, and abdominal pain. Hepatomegaly was observed in only 19% of the patients. A positive tourniquet test was the most frequently observed hemorrhagic manifestation, but epistaxis was observed in 20% and hematemesis in 6% of the patients. Dengue shock syndrome was observed in 37% of the patients. There were four deaths, three of which were confirmed as due to dengue infection by virus isolation. The data suggest that one, and possibly two, of the fatal cases with virus isolation were primary infections, based on the results of hemagglutination-inhibition test using all four dengue antigens.

Antibodies, Viral

Intestinal and blood parasites in the Banggai Kabupaten, Central Sulawesi, Indonesia.

A survey for blood and intestinal parasites was carried out in the Banggai Kabupaten Central Sulawesi, Indonesia. A total of 336, stool specimens were obtained from 182 males and 154 females ranging in age from 2 to 90 years. Hookworm, Trichuris trichiura and Ascaris lumbricoides were the most common helminths encountered. Schistosoma japonicum was noticeably absent in the population sampled. The following intestingl protozoa were detected: Entamoeba coli, E.histolytica, Iodamoeba bütschlii, Giardia lamblia, Chilomostix mesnili and Endolimax nana. A total of 650 blood smears were examined and both Plasmodium falciparum and P. vivax were found in 5 % of the populations sampled. In addition, Brugia malayi microfilariae were detected in 3% of the blood smears examined.

Blood

Parasites of man in remote areas of Central and South Sulawesi, Indonesia.

A biomedical survey was conducted in 10 villages in remote, high mountain valleys of Central and South Sulawesi, Indonesia to learn whether Oriental schistosomiasis was endemic and to determine the prevalences of other intestinal parasites, malaria and filariasis in those areas. Although persons with Oriental schistosomiasis were found in three villages of South Sulawesi, follow-up inquiries revealed that these had recently migrated from a known schistosomiasis area in Central Sulawesi. Other intestinal parasites diagnosed were Ascaris lumbricoides (14%), Trichuris trichiura (7%), hookworm (68%), Entamoeba histolytica (3%), Entamoeba coli (17%), and Giardia lamblia (5%). Enterobius vermicularis, Strongyloides stercoralis, Trichostrongylus sp., Physaloptera sp., Diphyllobothrium sp. heterophyid, echinostome and dicrocoelid-like termatodes, Endolimax nana and Chilomastix mesnili were detected infrequently. Malaria parasitemias due to Plasmodium falciparum, P. vivax and P. malariae were detected in 4% of the sampled populations, Malayan filariasis was diagnosed in 21% of the subjects examined.

Adolescent

Unravelling the genomic potential of sponge-associated Streptomyces sp. BLC 17-3 from Indonesia for mannooligosaccharide production.

This research aims to show the promising capacity of Streptomyces sp. BLC 17-3 to produce high β-mannanase enzymes and generate mannooligosaccharide (MOS) such as mannobiose, mannotriose, mannotetraose and mannopentaose when exposed to mannan polymers. Streptomyces sp. BLC 17-3 was isolated from the sponge (Rhabdastrella globostellata) Put4 obtained from the marine waters of Putus Island in Bitung, North Sulawesi, Indonesia. The characterization results showed that the peak enzyme activity was achieved at 50 mM sodium acetate, 6.0 pH, and 60 °C temperature on the seventh day of production with a value of 155.77 ± 3.21 U/mL. The SDS-PAGE and zymograms also showed that the size of the enzyme molecule was approximately ±34.8-49.1 kDa. Moreover, whole-genome sequencing was conducted to identify the genetic basis of MOS-synthesizing capabilities in the selected strain, followed by functional annotation of genes encoding mannan degradation and associated functions. The results showed an 8,248,862 Mb complete draft genome of the strain which comprised 111 predicted gene models. Gene annotation also provided important information about the location and function of protein-encoding genes. A total of 6 mannan degradation-related genes encoding mannanase-related metabolism were identified and the three-dimensional structures were predicted using AlphaFold 3. This characterization and modeling further enhanced the bioprospecting and development of this strain which exhibited efficient mannose metabolism. The results showed Streptomyces sp. BLC 17-3 as a promising microorganism for the future bioproduction of MOS which were discovered to have the capability of serving as a potential prebiotic substance to enhance digestion and promote health.

Bioprospecting

Parasitology survey and seroepidemiology of amoebiasis in South Kalimantan (Borneo), Indonesia.

A parasitology surevy was conducted among inhabitants of 7 villages in 3 regencies in South Kalimantan Province, Indonesia. A total of 2,169 stool specimens, 2,756 blood smears and 1,027 serum specimens were obtained, representing samples from approximately 10%, 12% and 5% of the population, respectively. One to 8 different intestinal parasitic infections were detected in 97% of the people. Those parasites most frequently found were Trichuris trichiura (83%), Ascaris lumbricoides (79%), and hookworm (65%), followed by Entamoeba coli (37%), Endolimaxnana (12%), Entamoeba histolytica (12%), Iodamoeba bütschlii (11%), Giardia lamblia (5%), Entamoeba hartmanni (2%), Chilomastix mesnili (2%). Other parasites found were Enterobius vermicularis, Strongyloides stercoralis, Capillaria sp., Echinostoma sp., Hymenolepis diminuta, and Trichomonas hominis. Giardia lamblia was found more often in younger people and Entamoeba coli, Iodamoeba bütschlii and hookworm in the older age group. Ascaris lumbricoides occurred more frequently in females, and hookworm in males. Plasmodium vivax and Plasmodium falciparum were found in the blood smears of 4.4% of the people, mostly in the younger age groups. Seroepidemiological studies on amoebiasis were done by use of the indirect hemagglutination test with antigens prepared from the HK9 strain of Entamoeba histolytica maintained in axenic cultures. The frequency distribution of the reciprocal antibody titers showed a bimodal distribution with 34% of the population demonstrating positive reactions at titers of 1:128 or greater.

Adolescent

From sporulation to village differentiation: The shaping of the social microbiome over rural-to-urban lifestyle transition in Indonesia.

Despite established roles in human health and profound global diversity, microbiome datasets remain biased toward Western urban cohorts, with especial under-representation of Southeast Asia. Here, we present a gut microbiome dataset from 116 Indonesians spanning transitional hunter-gatherer, rural agricultural, and urban lifestyles. We identify 1,304 species and 3,258 subspecies by assembling 11,070 metagenome-assembled genomes, revealing substantial species- (15%) and subspecies- (50%) level novelty. Novel taxa are rare, often village specific, and depleted for sporulation genes, revealing a link between bacterial physiology, transmission, prevalence, and discovery. We identify rural-to-urban clines across multiple levels of biological organization, from species abundance to microbiome composition and diversity. Furthermore, between-community, but not within-community, diet variation is strongly predictive of microbiome composition, suggesting that microbiome divergence is driven by community-level differences. Our work highlights the interplay of host lifestyle, population structure, and bacterial physiology in shaping microbiome diversity and biogeography, at the key scale of human communities.

Humans