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Biomedical subjects

J H Cross

Publications and source records attributed to J H Cross.

At least 145 records · Page 8Linked to original sources
PubMed1978

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↗
PubMed1978

Further studies on Capillaria philippinensis: development of the parasite in the Mongolian gerbil.

Capillaria philippinensis larvae from the digestive tract of a Northern Luzon freshwater fish (Hypselotris bipartita) experimentally exposed to embryonated eggs, were given by stomach tube to Mongolian gerbils (Meriones unguiculatus). The larvae developed into adults within 10 to 11 days and female worms produced larvae within 13 to 14 days. These larvae developed into second generation adults by days 22 to 24 and the second generation females produced eggs that were present in the feces of the animal on the average 26 days after infection. Most females were oviparous but a few larviparous females were always present. The gerbils died on an average of 46 days after infection, with the highest numbers of worms recovered between days 36 and 46. All stages of the parasite were generally found at necropsy. Gerbils developed patent infections after receiving 2 or 3 laeval from fish, and 852 to 5,353 worms were recovered at necropsy. These studies show that autoinfection in an integral part of the life cycle of C. philippinensis, both initially and in maintaining the infection. The natural transmission of the parasite was demonstrated when H. bipartita from a lagoon in the endemic area were fed to gerbils and 3 became infected. The parasite can also be maintained in the laboratory by transfer of worms by stomach tube from the small intestines of an infected gerbil to a clean gerbil.

Animals↗
PubMed1978

Brugia malayi in Kresek, West Java, Indonesia: the effect of environmental changes of filarial endemicity.

A survey was conducted in Kresek, West Java, Indonesia and 813 persons from six villages examined for filariasis. Only eight had microfilaremia and one male person had elephantiasis. Comparing results obtained approximately ten years earlier and the present survey, there was a marked decrease in the microfilarial rate in Kresek, especially in Penameng, during the interim. There was no drug treatment, insecticide application or any dramatic population movement. The development of a well-organized irrigation system and the conversion of the swamps into rice-fields resulted in a decrease of breeding sites for Mansonia mosquitoes and subsequently a decrease in filariasis.

Adolescent↗
PubMed1978

Serological study of amoebiasis and toxoplasmosis in the Malili area, South Sulawesi, Indonesia.

Results of a serology survey in September 1972 for Entamoeba histolytica and Toxoplasma gondii antibodies among 915 volunteers from the Malili area of South Sulawesi (Celebes), Indonesia are presented. Indirect hemagglutination antibody titers for amoebiasis were found in 22.7% of the sampled population while 9.5% demonstrated antibody titers greater than or equal to 1:128. The frequency distribution of antibody titers were similar by sex and age. There was no significant correlation between stool positivity and seropositivity. Indirect hemagglutination antibody titers for T. gondii were detected in 62% of the population sampled, and titers greater than or equal to 1:32 were demonstrated in 29% of the samples tested. The distribution of antibody titers was similar in males and females. In both sexes the prevalence of IHA antibody titer against T. gondii increased with age. There was no consistent association between altitude and prevalence of seropositive samples.

Adolescent↗
PubMed1977

Biomedical survey in Irian Jaya (West Irian), Indonesia.

A biomedical survey was conducted in several areas of Irian Jaya, Indonesia in July 1972 in association with an investigation of reports of a cholera outbreak. Stool specimens, blood smears and sera were collected and examined for evidence of parasitic as well as other infectious diseases. A total of 114 stools were examined and the most commonly found intestinal parasites were Trichuris trichiura (94%), Ascaris lumbricoides (74%), hookworm (58%), Entamoeba coli (15%), Endolimax nana (8%), Entamoeba histolytica (7), Entamoeba hartmanni (4%), Giardia lamblia (3%) and Chilomastix mesnili (3%). A total of 513 blood smears were examined and Wucheria bancrofti microfilariae were detected in 4% and malaria in 4% (Plasmodium falciparum 3%, Plasmodium vivax 2%). The malaria and filarial positive individuals lived in Beeuw, Waigeo and Arar, Sorong. These parasitic infections were not detected in people from Biak City and Sburia, Biak. Sera were collected from 357 persons and significant antibody titers were found for Entamoeba histolytica (4%) Toxoplasma gondii (7%), Influenza A2 Hong Kong 68 (65%), Influenza B Taiwan 68 (78%), Japanese encephalitis virus (87%) and Dengue 1 virus (79%).

Adolescent↗
PubMed1977

Filariasis in West Kalimantan (Borneo), Indonesia.

A survey was carried out among persons residing in 8 villages in the Province of West Kalimantan, Indonesia to determine the prevalence of filariasis. Finger tip blood smears were obtained at night from over 3,000 people and microfilariae of Brugia malayi were found in 108 (3.5%) and Wuchereria bancrofti in 10 (0.3%). Most B. malayi (96 carriers) was found in Kakap, a village near the coast, 20 km from the provincial capital of Pontianak. Nine of 10 cases of W. bancrofti were located in Pahauman, a village 130 km northeast of the provincial capital. Periodicity studies indicate the strain of B. malayi to be subperiodic. In Kakap 18% of 226 persons examined had a clinical history of filariasis and elephantiasis was seen in 13%. This is the first report of rural bancroftian filariasis in the area. A few Mansonia species of mosquitoes were examined but none were infected with filarial larvae.

Adolescent↗
PubMed1977

Heat-labile enterotoxigenic Escherichia coli and intestinal protozoa in asymptomatic travellers.

Thirty-two asymptomatic travellers who had recently journeyed in the Near, Middle, and Far East and had experienced a high incidence of diarrhoeal disease were screened for heat-labile enterotoxigenic Escherichia coli (ent+ E. coli) and other bacterial and parasitic pathogens. Six percent were colonized with ent+ E. coli and while other bacterial pathogens were not found, the intestinal protozoa Giardia lamblia (13%), Entamoeba histolytica (6%), Entamoeba coli (6%), Endolimax nana (6%), and Entamoeba hartmanni (3%) were detected in the stools. Ent+ E. coli, G. lamblia and E. histolytica should be considered in the differential diagnosis of gastrointestinal disease in travellers returning from the Orient. Furthermore, these travellers may be a potential source for the introduction of ent+ E. coli into communities where such organisms are relatively rare.

Adult↗
PubMed1977

Brugia malayi in seven villages in South Kalimantan, Indonesia.

Seven villages in South Kalimantan were visited in 1971 and night peripheral blood smears from 2,764 people examined for microfilariae. Brugia malayi was found endemic in all villages with microfilarial rates of 12--46% (average 25%) and the median microfilarial density (MfD50) of 6 to 15 microfilariae per 20 microliter of blood. The microfilariae showed a typical subperiodic pattern. The disease was more common in males than females and the prevalence increased with age. Clinical manifestations of filariasis were found in 20% of 1,099 persons examined. Mansonia species are considered important vectors and cats important reservoir hosts. In addition to B. malayi, Dirofilaria repens and an unknown microfilaria were found in cats in the area and strains of the B. malayi and D. repens have been established in the laboratory.

Adolescent↗
PubMed1977

Malayan filariasis in Central Sulawesi (Celebes), Indonesia.

Seven villages in Central Sulawesi were surveyed in September 1971 and finger blood samples from 3,658 persons examined for microfilariae. Periodic, nocturnal Brugia malayi was endemic in all seven villages with microfilarial rates (Mf-rate) of 10-42% (av. 25%). The median microfilarial density (MfD50) averaged 5.4 and varied from 0.8 to 9.4 microfilariae per 20 microliter of blood. Males had higher Mf-rate and MfD50 value than females and in males Mf-rates and MfD50 values increased with age. In the female population, however, neither Mf-rates or MfD50 values varied significantly with age. Clinical manifestations of filariasis were found in 12% of 2,412 persons examined and only 2% had elephantiasis. Clinical signs of disease with the exception of elephantiasis, showed good correlations with Mf-rates but not with MfD50 values. Transmigrants experienced clinical manifestations of filariasis earlier and more often than the indigenous population.

Adolescent↗
PubMed1977

Biomedical survey in North Samar Province, Philippine Islands.

A biomedical survey was carried out in North Samar Province, Philipines to update information on the prevalence of parasitic and other infectious diseases. A total of 1,394 stool specimens, 1,859 blood smears and 1,274 sera were collected from persons living in 8 barrios. Stools were examined for intestinal parasites, bloods smears for malaria and filariasis and sera tested for antibodies to Schistosoma japonicum, Entamoeba histolytica, Toxoplasma gondii, influenza A and B, and Japanese encephalitis virus. The prevalence rates for intestinal parasites were: Trichuris trichiura 90%, Ascaris lumbricoides 78%, hookworm 65%, Schistosoma japonicum 15%, Strongyloides stercoralis 1%, Entamoeba coli 16%, Endolimax nana 6%, entamoeba histolytica 5%, Giardia lamblia 3%, Entaemoeba hartmanii 1%, Chilomastix mesnili 1%. No malaria was found but microfilariae of Wuchereria bancrofti were detected in 4% of the blood smears; the MfD50 was 12.9. The circumoval precipitin test (COPT) was used to detect antibodies to Schistosoma japonicum and 65% of 994 sera was considered positive. The indirect hemagglutination test (IHA) was used for detecting antibodies to Entamoeba histolytica and Toxoplasma gondii and 5% and 3% of 1,274 sera tested were positive at titers equal to or greater than 1:128 and 1:256, respectively. Hemagglutination inhibition tests (HI) were used to detect antibodies to Influenza A2HK68, Influenza A2HK68, Influenza B2T62 and Japanese encephalitis virus and 72%, 12% and 78%, respectively, of 1201 sera were considered positive at titers equal to or greater than 1:20.

Adolescent↗
PubMed1977

Brugia timori sp. n. (nematoda: filarioidea) from Flores Island, Indonesia.

Brugia timori sp. n. from experimentally-infected Mongolian jirds (Meriones unguiculatus) is described. The adult male differs from other Brugia species, except Brugia malayi, in having a spicular ratio of 3 : 1; it differs from B. malayi in having greater numbers of subventral adanal papillae (up to 5 on each side) that are loosely spaced and irregularly positioned about the cloaca, a greater diameter of the capitulum of the left spicule, greater lengths of the proximal- and midsections of the left spicule, and a greater length of the proximal section of the right spicule. The adult female has an ovejector of greater length and width than that of B. malayi. Microfilariae in the blood of persons from whom the parasite lines of this study originated were typical of the Timor type, having a greater total body length than other Brugia spp., a length to width cephalic space ratio of about 3 : 1, and a sheath which did not stain when processed in the usual manner with Giemsa.

Animals↗