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Biomedical subjects

J van den Ende

Publications and source records attributed to J van den Ende.

At least 55 records · Page 3Linked to original sources
PubMed1988

The prevalence and transmission of hepatitis B virus infection in urban, rural and institutionalized black children of Natal/KwaZulu, South Africa.

The sera of statistically selected urban (805), rural (238) and institutionalized (127) black children were tested for markers of hepatitis B virus (HBV) infection. The age-standardized (6-14 years) prevalence rates of HBs antigenaemia for comparison between urban, rural and institutionalized children were 10%, 18.5% and 25.1% and the HBV exposure rates were 31.4%, 62.1% and 72.0% respectively. In the newborn to six years age group the prevalence rates of HBsAg and HBV exposure were 2.5% and 7.1% for urban children and 53.1% and 70.3% for institutionalized children. Peak prevalences of HBsAg occurred in the 6-8 year age group and were 14.4% and 22.6% in urban and rural children respectively. Hepatitis Be Antigen (HBeAg) was detected in 46.5% and antibodies to hepatitis Be antigen (HBeAb) in 10.0% of all HBsAg positive children. Multiple mechanisms involving horizontal rather than vertical transmission appeared to be important in urban children, with HBV exposure in females being significantly associated with ear-piercing (p less than 0.001) and scarification (p less than 0.05). In addition, HBsAg was detected in 25 of 29 pools of bloodfed mosquitoes caught at the children's institution and was negative in all four pools of unfed mosquitoes, suggesting that these arthropods may also be one factor in the horizontal spread of HBV infection. Familial clustering of HBV infection was suggested by a significantly higher (p less than 0.01) prevalence of HBsAg amongst family contacts of HBsAg positive urban children (17.7%) than in the control groups of family contacts of HBsAb positive children (8%) and children who were negative for all HBV markers (2.4%). The significance and implications of these findings are discussed.

Adolescent↗
PubMed1987

Cryptosporidium-associated diarrhoea in children.

Over a 3-month period during summer, 30 out of a group of 194 children admitted with a primary diagnosis of gastro-enteritis with dehydration were found to excrete cryptosporidium oocysts in their stools. On retrospective analysis, children with cryptosporidia in their stools had a significantly higher mortality than those without. They spent a longer time in hospital and were more likely to have intestinal salmonella infection. They also had a higher incidence of bronchopneumonia. They were not significantly different from the group of children without cryptosporidia in respect of age, mass for age, duration of symptoms prior to hospitalization, prior treatment, or severity of metabolic derangement on admission. Since cryptosporidiosis has a recognized association with immune deficiency, the presence of cryptosporidium oocysts in the stools of our children with diarrhoea may be a pointer to morbidity and mortality.

Cryptosporidiosis↗
PubMed1987

Meningitis caused by vancomycin-resistant Leuconostoc sp.

A rare case of purulent meningitis caused by vancomycin-resistant Leuconostoc sp. is reported. The patient was treated successfully with penicillin G, and there were no neurological sequelae. We recommend that all gram-positive cocci isolated from cerebrospinal fluid and blood be fully identified so as not to confuse Leuconostoc spp. with more commonly isolated pathogens such as pneumococci and other alpha-hemolytic streptococci.

Adolescent↗
PubMed1986

An analysis of blood culture isolates from 7 South African teaching hospital centres.

The data on blood culture isolates for 1983 and January - July 1984 reported by the Antibiotic Study Group of South Africa have been analysed to determine national and regional prevalences of different micro-organisms and resistance to certain antibiotics. Although there are significant differences in isolation frequencies between the various centres, overall the five most frequent isolates are Staphylococcus aureus (1983 - 15%; 1984 - 14%), Escherichia coli (13%), Klebsiella spp. (11%; 10%), Streptococcus pneumoniae (9%), and Salmonella typhi (7%; 13%). Staph. aureus ranks first in most centres for 1983 but is displaced in some in 1984 by enteric Gram-negative bacilli. In Durban S. typhi is the most common isolate for the entire period. Methicillin resistance among Staph. aureus is common (approximately 30% overall), especially in the Transvaal. Gentamicin resistance among certain Gram-negative bacilli is a problem in many centres and is especially disturbing in the case of Klebsiella spp., of which over 30% of total isolates are resistant. Ampicillin resistance for Haemophilus influenzae varies from nil to over 30% in different centres, and penicillin-resistant pneumococci are still encountered (nil to over 10%).

Ampicillin↗
PubMed1985

[Positive serological tests for syphilis in black primary school children in Bloemfontein: a pilot study].

Sera from 1575 black primary school children in Bloemfontein were subjected to serological screening tests for syphilis. Forty-six (2,92%) were found to be seropositive on screening; 32 (2,03%) of these were confirmed as true-positive reactions and 10 (0,64%) manifested only biological false-positive reactions. Four sera were insufficient for confirmatory tests. From published reports covering a period of over 60 years, it is evident that syphilis is widespread in South Africa, especially in black communities. There is no evidence of a decline in the prevalence of the disease but rather of an increase, including endemic syphilis affecting children. A nationwide survey is recommended to determine the magnitude of the problem and the need for a sustained treatment campaign.

Adolescent↗
PubMed1985

Pharmacokinetic study of a paediatric formulation of amoxycillin and clavulanic acid in children.

A combination of amoxycillin and clavulanic acid 4:1 was administered to 35 children (aged 2 to 10 years) with infections. The combination was administered orally as a suspension, every 8 h for 5 to 7 days. Sixteen children (aged 2 to 5 years), received 125 mg amoxycillin and 31.25 mg clavulanic acid, and 19 (6 to 10 years) received 250 mg amoxycillin and 62.5 mg clavulanic acid per dose. Following the first dose serum concentrations of amoxycillin and clavulanic acid were determined by microbiological assay. In the younger group receiving the lower dosage (mean: amoxycillin 9.11 mg/kg and clavulanic acid 2.34 mg/kg), the mean peak concentration of amoxycillin was 3.5 mg/l and of clavulanic acid 1.2 mg/l, occurring 1.32 h and 1.39 h, respectively, after administration. In the older group receiving the higher dosage (mean: amoxycillin 12.35 mg/kg and clavulanic acid 3.14 mg/kg) the mean peak serum level of amoxycillin was 4.0 mg/l and of clavulanic acid 1.3 mg/l, occurring 1.43 h and 1.23 h, respectively, after administration. The higher dose per kilogram body weight resulted in a higher peak serum concentration both of amoxycillin and clavulanic acid. The formulation was well tolerated by all the children and no serious side-effects were recorded. Treatment was considered clinically effective in all cases.

Amoxicillin↗
PubMed1983

Efficacy of ampicillin and cefoxitin in the treatment of acute pelvic inflammatory disease. A comparative study.

Sixty patients with acute uncomplicated pelvic infection were treated with cefoxitin or ampicillin alone, the purpose being to show that a relatively cheap antimicrobial agent (ampicillin) could be used. The groups (30 patients in each) were clinically comparable (P greater than 0,01--Hotelling T-square test). In the first group 2 g ampicillin was administered intravenously on admission followed by 1 g intravenously 4-hourly, and in the second group 2 g cefoxitin was administered intravenously on admission followed by 1 g intravenously every 8 hours. A good response was obtained in both groups. On the basis of cost ampicillin would seem to be the treatment of choice in uncomplicated acute pelvic infection.

Acute Disease↗
PubMed1981

[The formulation of objectives in a medical faculty].

As a starting point in a process of curriculum reevaluation, the Faculty of Medicine of the University of the Orange Free State prepared a document stating the objectives of its undergraduate medical training. Seventeen general faculty objectives stating the broad educational aims of the Faculty were formulated. From these general objectives intermediate objectives were derived. These intermediate objectives are intended to serve as a guide to departments in the planning of individual courses during the various phases of the curriculum.

Curriculum↗
PubMed1981

Patent coverage by abstracting services. 4. Coverage of microbiological patents.

The paper reports a study on the coverage by seven major abstracting services in the field of microbiology in regard to patents. Only three of the services--Chemical Abstracts, Microbiology Abstracts, Section A, and Food Science and Technology Abstracts--cover patents at all. We assessed the three services in terms of the information they provide about patents and then in terms of their performance in retrieving patents taken from a master list of patents on genetic engineering and Vitamin D, obtained by searches on World Patents Index. Timeliness of the three services was also assessed. We found that none of the standard abstracting services in the field cover patents satisfactorily and they are slow in picking up patents. The research demonstrates that by scanning just Japanese, Soviet, U.S., and British patents, both timely and comprehensive coverage of the microbiological patent literature can be obtained.

Abstracting and Indexing↗
PubMed1980

Cholecystojejunocholecystostomy: a new method of biliary drainage in auxiliary liver allotransplantation.

A subhepatic, whole auxiliary liver allotransplant technique, previously developed in the pig, was assessed for technical feasibility in 26 human cadaver transplants. All technical aspects of the subhepatic technique were feasible, with the exception of donor to recipient gallbladder-to-gallbladder anastomosis, which could only be performed in 50% of subjects due to excessive separation of the two gallbladders. To oversome the problem, an original technique was developed--namely, the use of an isolated, vascularized, isoperistaltic loop of jejunum to act as a conduit between donor and recipient gallbladders (cholecystojejunocholecystostomy). Cholecystojejunocholecystostomy was subsequently developed and studied in a series of live porcine auxiliary allografts. The local, reginal, and general effects seen in 14 allografted pigs with cholecystojejunocholecystostomy were compared with those seen in a parallel and identical series of 14 allografts with cholecystocholecystostomy. The subhepatic transplantation technique is described in detail for the first time. Liver biopsies, blood samples, and clinical data were obtained at weekly intervals and at 28 days all survivors were killed. Cholecystojejunocholecystostomy proved to be a successful method of biliary drainage in the pig. Thirteen of the 14 interposed jejunal loops were viable and essentially normal at autopsy, leaks and naked eye stasis were infrequent, and the histological incidence of intrahepatic cholangitis and cholestasis minimal. The local, regional, and general effects were comparable in every way with those obtained with cholecystocholecystostomy.

Animals↗
PubMed1977

The incidence of infections in compromised patients at Groote Schuur hospital. An autopsy study.

The results of a retrospective autopsy study of 115 adult patients with haematological or lymphoreticular malignancies or who had undergone transplantation procedures, are presented. The overall incidence of infection was 65%, 123 infections being detected in 75 patients. The bulk of the infections involved the gastro-intestinal and respiratory systems, other systems being considerably less frequently affected. Patients who had received allografts and subsequent immunosuppression had the highest incidence of viral inclusions, especially cytomegalovirus. Candida infections were more common than aspergillosis, and severe fungal infections were most frequent in patients with acute leukaemia who had been treated aggressively. The only other mycosis detected was cryptococcosis. Bacterial pneumonia was the most frequent infection over-all (36%). Tuberculosis, pyelonephritis and Pneumocystis pneumonitis were also encountered.

Heart Transplantation↗
PubMed1977

A multicentre study of the susceptibility of a variety of bacteria to cephalothin, cefamandole, tobramycin and gentamicin.

A multicentre study of antibiotic susceptibility was performed in South Africa. Sensitivity to cephalothin, cefamandole, tobramycin and gentamicin was tested on a variety of aerobic and anaerobic bacteria. Two disc susceptibility techniques were used, i.e. the Kirby-Bauer technique (aerobes) and the broth-disc method (anaerobes); minimum inhibitory concentrations (MICs) were determined according to the International Collaborative Study techniques, and regression lines for individual centres were constructed. Satisfactory lines were obtained for cephalosporins, but, in some centres, problems were experienced with the aminoglycosides. Variations in MICs for Haemophilus influenzae were probably due to an inoculum effect. Accumulative percentage tables of the number of strains inhibited were compiled, and the comparative performance of the antibiotics was assessed.

Anti-Bacterial Agents↗
PubMed1977

The use of counter-immuno-electrophoresis to identify causative organisms in bacterial meningitis: experience in Cape Town.

Crebrospinal fluid (CSF) from 142 patients was tested for the presence of Haemophilus influenzae, pneumococcal and meningococcal antigens by counter-immuno-electrophoresis with commercial antisera. Group- or type-specific antigen was detected in the CSF of 67% of 64 patients with meningitis proved by culture to be due to these organisms, and in 10 of 25 patients with purulent meningitis but negative cultures. No false positive results were obtained in 24 normal CSF specimens, or in the CSF of 29 patients with meningitis caused by other organisms. The diagnostic usefulness of this specific, relatively simple and rapid procedure is confirmed.

Antigens, Bacterial↗