PubMed Health⌕ Search

Biomedical subjects

D Danielsson

Publications and source records attributed to D Danielsson.

At least 19 recordsLinked to original sources
PubMed1992

Early development in healthy children of serum opsonins against nonpathogenic Neisseria meningitidis.

In an earlier study, with the use of chemiluminescence (CL) and phagocytic killing, we could show that in the presence of serum from healthy adults polymorphonuclear leukocytes (PMNL) efficiently handle nonpathogenic Neisseria meningitidis strains, in sharp contrast to those associated with clinical disease. The major part of this difference was dependent on serum factors. In the present study 84 serum samples from children 1-3, 4-6, 7-9, and 10-14 years old were studied by the CL technique according to their ability to opsonize meningococci. There was a highly significant difference (p less than 0.001) in all four age groups when the CL indexes obtained with the pathogenic meningococci of the serogroups A, B and C were compared with those of the nonpathogenic menigococci: serogroup 29E and nongroupable meningococci. These findings imply that the ability to opsonize so-called nonpathogenic meningococci is developed early in life and may explain why they are only occasionally able to cause disease.

Adolescent↗
PubMed1992

Experimentally induced ileal ulcers in rats. Formula diet is a preventive factor.

We recently described an experimental model in the rat to create recurring chronic ileal inflammation including ulceration. This model is dependent on an "in vivo culture" of normal intestinal contents. In the present experimental study we examined the effect of a polymeric and a hydrolyzed formula diet on the formation of ulcerating lesions using our rat model. Two groups of rats (twenty in each group) were fed either one of these formula diets eight weeks prior to the experimental procedure and this diet was continued until sacrifice eight weeks later. Twenty control rats also underwent the experimental procedure but were fed standard rat pellets for the same time periods. At sacrifice 60% of the control rats had developed ileal ulcers. None of the rats fed the formula diets developed macroscopic ileal inflammation or ulceration. The effectiveness of formula diets in inducing remission in Crohn's disease in humans may be linked to alterations in the intestinal microflora. We hypothesize that the formula diets in this experiment exerted a protective effect against ileal ulceration by altering the ileal microflora. Preliminary studies support this hypothesis but need to be expanded.

Animals↗
PubMed1992

IgG subclass distribution in serum and rectal mucosa of monozygotic twins with or without inflammatory bowel disease.

Serum samples from 26 monozygotic twin pairs concordant or discordant with regard to inflammatory bowel disease, and rectal biopsies from 42 twins of the same subject group, were examined for IgG subclasses. They were all compared with normal controls. Almost all affected twins were in clinical remission. Paired immunofluorescence staining of the rectal mucosa showed that those with ulcerative colitis had a significantly higher (p < 0.01) proportion of IgG1 producing mucosal immunocytes than normal controls (78.1% v 55.9%). Conversely, the IgG2 cell fraction was significantly reduced (15.9% v 34.6%). Healthy twins from ulcerative colitis pairs tended to show a raised proportion of IgG1 cells and the IgG2 cell fraction was significantly reduced (p < 0.05). In discordant ulcerative colitis twin pairs, no difference appeared in the cellular IgG subclass pattern between healthy and affected twins. Furthermore, the proportion of IgG1 in these healthy and diseased twins showed good correlation (T = 0.867). The results in rectal mucosa of twins with Crohn's disease were widely scattered and affected twins did not differ significantly from normal controls. Healthy twins, however, showed a marginally raised IgG1 cell proportion, but no correlation was seen between the IgG subclass fractions in discordant Crohn's disease twin pairs. The serum concentrations of IgG1 and IgG2 did not differ from normal controls in twins of either category. These results suggested that in ulcerative colitis, the aberrant mucosal production of IgG1 and IgG2 does not depend on active disease, but is apparently at least partially explained by a genetic impact. Conversely, the mucosal IgG subclass pattern in Crohn's disease appears to be determined mainly by exogenous variables.

Adult↗
PubMed1991

Atopic allergy to chloramine-T and the demonstration of specific IgE antibodies by the radioallergosorbent test.

Chloramine-T is a small molecular oxidizing agent that has been widely used as a disinfectant since the beginning of this century. It is generally used in a 5% solution but it is also supplied in powder form. Sporadic case reports of immediate-type sensitization to this agent associated with symptoms of asthma, rhinitis and urticaria have appeared during recent decades. In one of the reports, specific IgE antibodies in sera of four patients who developed asthmatic symptoms after exposure to chloramine-T were demonstrated using a radioimmuno-assay. Three cases of bronchial asthma in workers who had handled chloramine-T powder are described in the present report. Positive skin-prick test reactions to chloramine-T were observed and specific IgE antibodies to human serum albumin treated with chloramine-T were detected using the classic radioallergosorbent (RAST) technique in all three patients.

Adult↗
PubMed1991

Mobiluncus species in bacterial vaginosis: aspects of pathogenesis.

Mobiluncus is an anaerobic motile rod associated with bacterial vaginosis. In this work, luminol-enhanced chemiluminescence was used to study the ability of Mobiluncus spp. from the vaginas of women with bacterial vaginosis to induce, in the presence of normal adult serum, oxidative metabolism of polymorphonuclear leukocytes, which is an indirect measure of phagocytic activity. M. curtisii induced a significantly (p less than 0.05) lower response than M. mulieris, which indicates that M. curtisii escapes phagocytosis more easily. Indirect immunofluorescence assays showed IgG antibodies to M. curtisii at significantly (p less than 0.01) higher titres than to M. mulieris in women with bacterial vaginosis. The titres were higher in patients with bacterial vaginosis than in women without vaginosis and healthy men. No antibodies to Mobiluncus spp. of secretory IgA type were found in vaginal washings. These results indicate that M. curtisii is a more virulent species than M. mulieris, and agree with reports of M. curtisii found in postoperative and extragenital infections.

Adult↗
PubMed1990

Current status of serotyping of Neisseria gonorrhoeae.

Protein I has become the basis of serotyping of N. gonorrhoeae. A panel of 12 anti-protein I monoclonal antibodies is supplied by Syva Company, Palo Alto, CA, through distributors for research purposes only. These distributors are responsible for storing the monoclonal antibodies, supplying research groups and training new users, particularly in the interpretation of coagglutination reactions. A European Workshop was held in Heidelberg, Federal Republic of Germany in July 1988 to discuss serotyping with these antibodies. The current uses of serotyping of N. gonorrhoeae include epidemiological studies, clinical purposes and surveillance of antibiotic resistance and plasmid carriage. Predominant serovars may be subtyped either by additional antibodies or with the use of another technique, such as auxotyping, determination of antibiotic sensitivities, plasmid analysis or genetic fingerprinting. Conversely, there is growing evidence that it may be appropriate to group certain serovars together. Data collected during prevalence studies could be combined with clinical information and an international data bank set up. This supposes a close future collaboration of all groups involved in the epidemiology of N. gonorrhoeae.

Antibodies, Monoclonal↗
PubMed1990

Characterization of epidemic and nonepidemic Neisseria meningitidis serogroup A strains from Sudan and Sweden.

A random selection of 25 strains isolated during an epidemic caused by serogroup A Neisseria meningitidis in Sudan (1988), 3 preepidemic meningococcal strains (1985), and 26 serogroup A strains isolated from sporadic cases of meningitis in Sweden (1973 to 1987) were assessed for multilocus enzyme genotypes (ETs), DNA restriction enzyme patterns, outer membrane proteins, lipopolysaccharides, pilus formation, and antibiograms. All of the 25 Sudanese epidemic isolates and 22 of the Swedish strains were of the same or closely related ETs (ETs 3, 4, and 5), corresponding to clone III-1, which has been responsible for two pandemic waves in the last three decades. The earlier pandemic involved Scandinavia, and the last one caused an outbreak during the pilgrimage to Mecca, Saudi Arabia (August 1987), spreading to Sudan, Chad, and Ethiopia. The three Sudanese preepidemic isolates (1985) were clone IV-1 (sulfonamide susceptible), which has been resident in the African meningitis belt for the last 25 years. The uniformity of clone III-1 strains (all sulfonamide resistant) from Sudan and Sweden was confirmed by DNA restriction enzyme patterns. ETs 3, 4, and 5 from Sudan and Sweden had 86 to 100% similarity to a Swedish clone III-1 reference strain, whereas ETs 1, 2, 6, and 7 showed 50 to 80% similarity. Class 1 protein for clone III-1 showed serosubtype antigens P1.9 and P1.x, whereas ET6 strains (clone IV-1) had serosubtype P1.7. Lipopolysaccharides were variable in the Sudanese and Swedish strains. Pili were expressed in all clone III-1 isolates from Sudan and Sweden but in none of the clone IV-1 isolates (Sudan, 1985).

Antigenic Variation↗
PubMed1990

Epidemiology and aetiology of acute non-tuberculous salpingitis. A comparison between the early 1970s and the early 1980s with special reference to gonorrhoea and use of intrauterine contraceptive device.

More patients were hospitalised for acute salpingitis at the Department of Obstetrics and Gynaecology, Orebro Medical Centre, Orebro, Sweden, during the 5 year period 1970-1974 (period I) as compared with that of 1980-1984 (period II), 666 patients and 524 respectively, a decrease of 22%. The majority of cases, 92% in period I and 85% in period II, occurred among women 15-34 years of age, that is a relative increase of patients aged over 34 from 8% in period I to 15% in period II. Concomitant urogenital gonorrhoea occurred in 26.2% of the patients in period I compared with 12.0% in period II, a highly significant decrease (p less than 0.001) mainly confined to the age group 15-24, whereas there was no relative difference for the two periods in the age group 25-34 years. The number of patients using intrauterine contraceptive device (IUCD) was 96/666 (14.4%) in period I compared with 113/524 (21.6%) in period II (p less than 0.001). There were also relatively more IUCD users among the patients with gonorrhoea and acute salpingitis in period II (15.5%) compared with period I (10.4%) but this difference was not statistically significant. From 1981 to 1984 370/424 patients were cultured for Chlamydia trachomatis and 27.8% (103/370) were positive. Thus Chlamydia trachomatis is at present, at least in the Orebro area, the most frequently isolated STD agent among acute salpingitis patients while gonorrhoea is of much less importance.

Acute Disease↗
PubMed1990

Gonorrhea: diagnostic and therapeutic strategies in the era of resistance to antibiotics.

Culture procedures are the methods of choice for the diagnosis of gonorrhea, and they also allow for antibiotic susceptibility testing of isolated gonococcal strains. This is important because of the growing frequency in many countries of infections with antibiotic-resistant strains. The present report discusses the diagnosis, epidemiology, and various modes for treatment of infections with plasmid-mediated high-level penicillin- and high-level tetracyclin-resistant gonococcal strains, as well as infections with gonococcal strains with chromosomally mediated resistance to penicillin, spectinomycin, and other antibiotics, such as the quinolones. The importance of subjecting treated patients to tests of cure is stressed, as well as the need for continous surveillance studies and strategies for control.

Anti-Bacterial Agents↗
PubMed1990

Gonorrhoea and syphilis in Sweden--past and present.

Gonorrhoea and syphilis that belong to our oldest recognized sexually transmitted diseases (STD) are also the prototypes of curable STDs. After the discovery of the causative organisms, Neisseria gonorrhoeae in 1879 and Treponema pallidum in 1905, diagnostic tests were developed and by this, in conjunction with instituted regulations and legislation, means were created for public health authorities to collect statistical data. Sweden has fairly reliable statistics of both syphilis and gonorrhoea from 1912 and onwards, and these data show many interesting characteristics. Syphilis was prevalent in Sweden among both males and females during World War (WW) I and peaked in 1920 with an incidence rate of 150 and 75 per 100,000 population, respectively. The incidence figures fell rapidly after 1920 and reached a low of less than 30 cases per 100,000 in the mid 1920s, probably as a result of systemic treatment with Salvarsan in conjunction with vigorous contact tracing, two important measures to bring an infectious disease under epidemiological control. There was a slight increase of male syphilis in the late 1920s and early 1930s, and of both male and female cases during WW II which never reached the incidence figures of WW I. Penicillin was introduced in the mid 1940s for treatment and was proved superior to Salvarsan. The incidence figures have been very low ever since the early 1950s.(ABSTRACT TRUNCATED AT 250 WORDS)

Female↗
PubMed1989

Rapid diagnosis of bacterial meningitis by an enzyme immunoassay of cerebrospinal fluid.

A total of 250 cerebrospinal fluid (CSF) specimens were analyzed using a rapid enzyme immunoassay (Pharmacia Meningitis EIA-Test) (EIA) for the detection of antigens of Haemophilus influenzae type b, Neisseria meningitidis (serogroups A,B,C) and Streptococcus pneumoniae (25 selected types). The test is performed in less than 1 h and read by the naked eye. EIA and coagglutination (CoA) were compared with a constructed reference that comprised samples which were either positive by culture and/or on direct microscopy (DM), or in which there were positive results with both EIA and CoA for the bacteria covered by the assays. Using this reference for CSF samples assayed in a period between two meningococcal meningitis epidemics, the sensitivity was 0.86 for EIA and 0.69 for CoA, the specificity 0.95 (EIA) and 0.97 (CoA), the predictive value for a positive result 0.81 (EIA) and 0.87 (CoA) and, the predictive value for a negative result 0.96 (EIA) and 0.93 (CoA). Antibiotics had been given to 54% of the patients before admission. All of the 56 samples that were positive in any of the tests taken during an epidemic of group A meningococcal disease were detected by EIA; CoA was negative in 45% and culture/DM was negative in 32%. Sequential dilutions of two CSF samples from which H. influenzae type b had been isolated, showed the EIA to be 16-32 times more sensitive than CoA. With both technical feasibility and good sensitivity and specificity, the EIA seems to be useful and reliable for the rapid diagnosis of bacterial meningitis, especially in situations where pretreatment with antibiotics are likely.

Antigens, Bacterial↗
PubMed1989

Serum immunoglobulins and IgG subclasses in patients with glomerulonephritis.

The serum concentrations of IgG, IgA, IgM and of the four subclasses of IgG were determined by radial immunodiffusion in 103 patients, mean age 42 (range 16-72), with various types of glomerulonephritis. Forty-nine healthy blood donors, mean age 41 years (range 19-65), served as controls. Kidney biopsies were obtained from all the patients for examination by histopathology and by immunofluorescence. The glomerulopathies were classified according to WHO criteria. The serum immunoglobulin patterns were different for the various clinical groups of patients. Patients with Wegener's granulomatosis, rapidly progressive glomerulonephritis and SLE had a significant increase in total IgG and of IgG4 (P less than 0.05-0.001). Patients with minimal change disease had low concentrations of IgG (P less than 0.001) with a significant decrease in IgG1 and IgG2 (P less than 0.001 and 0.01, respectively). Highly significant increases in IgA were noted for patients with IgA nephritis (P less than 0.001) but high levels were also seen in patients with chronic glomerulonephritis. The findings might have diagnostic implications.

Adolescent↗
PubMed1989

Increased adherence to vaginal epithelial cells and phagocytic killing of gonococci and urogenital meningococci associated with heat modifiable proteins.

Urogenital Neisseria meningitidis were characterized with regard to serogroup, colony morphology, the presence of heat modifiable proteins (HMP), attachment to human vaginal and buccal epithelial cells, and phagocytic killing by polymorphonuclear leukocytes. The findings were compared with those on gonococci, and with those on meningococci isolated from blood or cerebrospinal fluid, with regard to colony morphology, HMP and piliation. The opacity colony morphology characteristic could be used to predict the presence of HMP in gonococci but not in meningococci, and sodium dodecyl sulphate polyacrylamide gel electrophoresis had to be used to demonstrate this surface protein. The urogenital meningococci, serogroup Y, attached significantly more efficinetly to vaginal epithelial cells in the presence of HMP and behaved in this respect like those of gonococci. Gonococci and meningococci containing HMP were more sensitive to phagocytic killing than those without HMP. Meningococci from opaque and transparent colonies and isolated from patients with meningococcal disease had no demonstrable HMP. They showed low adherence to vaginal and buccal epithelial cells, with no difference between organisms from opaque or transparent colonies.

Bacterial Adhesion↗
PubMed1989

Detection of antibody responses in rabbits hyperimmunized with Campylobacter pylori. Enzyme immunoassay indicates extensive antigenic similarities.

Acid glycine extracts from four Campylobacter pylori strains and one GCLO strain were used as antigens in enzyme immunoassay (EIA). Immune responses of rabbits immunized with C. pylori strains, the GCLO-strain and other campylobacter strains were studied. All 14 rabbit antisera against C. pylori reacted with all four C. pylori extracts and there were extensive cross-reactions between these extracts. Antisera against C. jejuni and C. coli strains did not react with a C. pylori extract but reached with the GCLO antigen. Acid glycine extracts proved to be very satisfactory in C. pylori serology and the use of an extract prepared from only one strain instead of a combination of strains seems justified.

Animals↗