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PubMed1978

Clinical aspects on 64 cases of juvenile and adult listeriosis in Sweden.

In 1958-74 altogether 64 cases of bacteriologically verified infections of Listeria monocytogenes were diagnosed in Sweden in children, aged more than 27 days, and in adults. Immunosuppression predisposed to the disease. Thus, many patients had co-existing disorders, such as leukemia and alcoholism. Sixteen patients had been treated with corticosteroids, which were combined with cytostatic drugs in nine. Meningoencephalitis was diagnosed in 52 patients and was fatal in 16. The clinical symptoms did not differ from those in purulent meningitis caused by other bacteria. In the cerebrospinal fluid the cellular response was dominated by polymorphonuclear cells in 29 patients and by mononuclear cells in 20. Ten patients had septicemia, which was fatal in four. Clinical symptoms were dominated by chills, high fever and general prostration. One patient had pleurisy and one an abscess of the neck; both recovered. Serotypes 1 and 4b prevailed and were equally common. Many patients developed raised antibody titers in both the O-agglutination test and the complement fixation test. The titers were often not positive until after a month. Moderate granulocytosis was the rule and monocytosis was rarely seen. Ampicillin alone or combined with an aminoglycoside seemed to be the drug of choice in the treatment of listeriosis. An alternative drug was tetracycline. Most deaths occurred within six days of onset of the illness. Early diagnosis and treatment were imperative. Most patients recovered and serious sequelae were rare.

Abscess↗
PubMed1996

Immunological studies on venereal spirochetosis of rabbits (rabbit syphilis).

White rabbits in a family, which were clinically diagnosed as moderately or severely diseased with spirochetosis, were bacteriologically and immunologically examined. The specimens from the diseased rabbits, including affected prepuces, scrotum, or skins with an occasional presence of the spirochetes, did not, however, result in growth in six conventional culture media. Serological tests, including quantitative complement fixation test, rapid plasma reagin card test, Treponema pallidum hemagglutination test, and microscopic agglutination test for leptospires using sera from diseased rabbits showed no differences when compared with those of pooled normal rabbit sera. Immunoblot analysis of the polypeptides from three human oral treponemes and three non-oral spirochetes demonstrated that antibodies against several treponemal polypeptides were detected.

Animals↗
PubMed1987

Detection of antibodies to Anaplasma marginale by an improved enzyme-linked immunosorbent assay with sodium dodecyl sulfate-disrupted antigen.

Sensitivities of two enzyme-linked immunosorbent assays (ELISAs) with particulate and sodium dodecyl sulfate (SDS)-disrupted Anaplasma marginale antigen were compared. The quotient of positive reference sera divided by the absorbance quotient of a negative reference serum at identical dilution was termed the signal-to-noise ratio. Optimal signal-to-noise ratios were dependent on both pretreatment of antigen and antigen concentration. SDS disruption of anaplasmal antigen resulted in a markedly improved signal-to-noise ratio of ELISA compared with ELISA with untreated antigen at identical antigen and serum dilutions. This represented higher sensitivity and lower background absorbance of the ELISA with disrupted antigen. SDS-disrupted A. marginale antigen was standardized by protein determination, and antigen, as well as precoated microtiter wells, was stored frozen without apparent loss of antigenic properties. ELISA results were in agreement with results of positive and negative control sera tested by the complement fixation test or by light microscopy Anaplasma diagnosis in Giemsa-stained blood films.

Anaplasma↗
PubMed1994

Evaluation of a new reagent for anti-cytomegalovirus and anti-Epstein-Barr virus immunoglobulin G.

The Enzygnost alpha method was tested against the complement fixation test and anti-VCA immunofluorescence to determine the respective titers of anti-cytomegalovirus and anti-Epstein-Barr virus immunoglobulin G antibodies. For cytomegalovirus, the Enzygnost results showed 97.99% agreement with the readings obtained by the alternative method, with 100% sensitivity and 93.7% specificity. For Epstein-Barr virus, Enzygnost showed 97.71% agreement, 100% sensitivity, and 91.11% specificity.

Adult↗
PubMed1999

Competitive enzyme immunoassay for diagnosis of human brucellosis.

The methods commonly used for human brucellosis serological testing are agglutination tests and the complement fixation test (CFT). Among the newer serological tests, primary binding assays were developed to improve sensitivity and specificity. The competitive enzyme immunoassay (CELISA) for the detection of serum antibody to Brucella is a multispecies assay which appears to be capable of differentiating vaccinal and cross-reacting antibodies from antibodies elicited by field infection in cattle. The competing monoclonal antibody used in this assay is specific for a common epitope of smooth lipopolysaccharide (S-LPS). In this study, we compared the CELISA to the classical tests for the diagnosis of human brucellosis. The CELISA cutoff value was determined to calculate its diagnostic specificity and sensitivity. A survey was performed with 911 sera. Of the sera, 341 were from an asymptomatic population that tested negative with conventional serological tests (screening and confirmatory). Based on these samples, the CELISA specificities were determined to be 99.7 and 100% with cutoff values of 28 and 30% inhibition (%I), respectively. In a further study with 393 additional sera from an asymptomatic population found negative by the conventional screening tests, the CELISA specificities were calculated to be 96.5 and 98.8% with cutoff values of 28 and 30%I. The CELISA sensitivities were determined to be 98.3 and 94.8% with cutoff values of 28 and 30%I, respectively, for sera from 116 individuals found positive by the classical tests. For the 51 culture-positive patients, CELISA was positive for 100%, the CFT was positive for 92%, and the standard tube agglutination test (TAT) was positive for 100%. The CELISA specificity was 100% for 31 sera from patients found negative by conventional serological tests but with brucellosis-like symptoms. The CELISA is fairly rapid to perform, somewhat faster than TAT, and cross-reacts less with other antigens (or antibodies) than the conventional tests. Further, the CELISA is simpler to perform that the CFT and may readily be standardized by the use of purified S-LPS antigen and monoclonal antibody for competition.

Antibodies, Bacterial↗
PubMedDate not supplied

Trends of T. cruzi infection based on data from blood bank screening.

Between October 1988 and April 1989 a cross-sectional survey was carried out in six out of eight blood banks of Goiánia, Central Brazil. Subjects attending for first-time blood donation in the mornings of the study period (n = 1358) were interviewed and screened for T. cruzi infection as a part of a major study among blood donors. Tests to anti-T. cruzi antibodies were performed, simultaneously, by indirect hemagglutination test (IHA) and complement fixation test (CFT). A subject was considered seropositive when any one of the two tests showed a positive result. Information on age, sex, place of birth, migration and socio-economic level was recorded. Results from this survey were compared with seroprevalence rates obtained in previous studies in an attempt to analyse trend of T. cruzi infection in an endemic urban area. The overall seroprevalence of T. cruzi infection among first-time donors was found to be 3.5% (95% confidence interval 2.5%-4.5%). The seroprevalence rate increased with age up to 45 years and then decreased. Migrants from rural areas had higher seroprevalence rates than subjects from urban counties (1.8%-16.2% vs. 0%-3.6%). A four fold decrease in prevalence rates was observed when these rates were compared with those of fifteen years ago. Two possible hypotheses to explain this difference were suggested: 1. a cohort effect related with the decrease of transmission in rural areas and/or 2. a differential proportion of people of rural origin among blood donors between the two periods. The potential usefulness of blood banks as a source of epidemiological information to monitor trends of T. cruzi infection in an urban adult population was stressed.

Adult↗
PubMed2000

[Experience with simple ELISA test systems for Brucella serology in cattle, sheep and goats].

The objective of this work was to use the ELISA technique for the serological surveillance for freedom of brucellosis of cattle, sheep and goats. By comparing 28 cattle sera taken after a brucellosis outbreak, 15 bovine sera supplied by the Federal Institute for Health Protection of Consumers and Veterinary Medicine (BgVV) and 497 serum slow agglutination test (SSAT) and complement fixation test (CFT) negative bovine sera from herds officially declared free of brucellosis, the ELISA technique not only shows higher sensitivity as compared to SSAT and CFT but also distinguishes clearly between positive and negative reactions. The serological comparison by SSAT, CFT and ELISA of 615 cattle, 624 sheep and 630 goat sera from herds acknowledged as brucellosis free showed equivalent specificities for both CFT and ELISA. The specificity of the SSAT was much lower, 81.1% in cattle and 96.2% in goat sera. The examination of 5796 cattle, 1337 calf, 5031 sheep and 1796 goat sera demonstrates the advantage of the ELISA technique as routine method. The possible application of the ELISA technique as a screening method for serological brucellosis tests in sheep, goats and possibly also in pigs is discussed.

Animals↗
PubMed1999

Typing for human platelet alloantigens.

Antibodies to platelet alloantigens, and sometimes to isoantigens, induce severe clinical problems such as neonatal alloimmune thrombocytopenia (NAIT), post-transfusion purpura (PTP) and refractoriness to platelet transfusions (PTR). For example, NAIT affects approximately 1 in 5,000 live births. It is essential, therefore, to screen pregnant women for platelet antibodies in order to save babies' lives. Almost 40 years ago, two platelet alloantigen systems were discovered using relatively simple methods, namely the platelet agglutination test and the complement fixation test. However, these methods were not sensitive enough to identify all antibodies in mothers and patients, even in those with severe clinical problems. Tremendous effort has been devoted to establish more sensitive and reliable methods. In recent years, excellent new serological and immunochemical methods have been established and several new platelet antigen systems have been discovered. Simultaneously, newly developed molecular genetic techniques have been introduced for the typing and analysis of human platelet alloantigen systems. These methods allow DNA typing for cases in which serological typing is not available. In this article, the history of studies on human platelet alloantigen systems and isoantigens, the nomenclature of platelet alloantigen systems and their alleles, the present status of antibody detection and typing techniques and, finally, ethnic variations in platelet antigen profiles are reviewed.

Alleles↗
PubMed1953

Recent studies on the immunity response to administration of different plague vaccines.

Evaluation of the immunity produced by plague vaccines was made by measurement of the reactions in the body fluids of man and different animals to demonstrate altered refractoriness. Four serological methods were used: the agglutination test, the complement-fixation test, the passive mouse-protection test, and the haemagglutination test. Results showed that the majority of animal and human hosts, in response to injections of Pasteurella pestis, vigorously develop antibodies which may persist in the peripheral blood serum for several months.Critical tests to establish the correlation between antibody response following inoculation with plague antigens or vaccines and resistance to infection showed that inoculation of 30mug of Fraction I antigen consistently protected mice against P. pestis infection and that there is a definite correlation between the appearance of serum antibodies and the immunity state of the mice. There is a similar correlation in guinea-pigs, although the immunogenicity of antigens and vaccines for these animals is very variable. Primates are rendered resistant to massive infection with 1,000,000,000 to 2,000,000,000 viable P. pestis by suspensions of formalin-killed bacilli and by heat- or chemically-killed broth vaccine administered in the customary human dose; basic immunization with Fraction I renders approximately 60% of monkeys immune.Evidence from experiments carried out on groups of human volunteers points to the conclusion that any plague vaccine containing 2-3 mg of Fraction I or capable of producing that amount when inoculated into the body will favourably alter the susceptibility of 50% of inoculated persons. But, to alter favourably the responsiveness of a greater percentage and to enhance the moderately effective immunity, re-inoculation at intervals of 3-6 months is essential.

Animals↗
PubMed1992

[Occurrence of Toxoplasma gondii antibodies in blood donors 1980-1990].

In 1980-1990 in the Strakonice district parallel serological examinations, using the Sabin-Feldman test (SFT) and complement fixation test (CFT), were made in 2,758 blood donors for the presence of antibodies against toxoplasmosis. The total number of examinations was 8,245. In the course of the mentioned time interval no significant increase or decrease of the serological prevalence occurred. During the first examination of blood donors the SFR antibodies (titre > or = 4) were detected in 45.4%, CFT (titre > or = 10) in 24.6% donors. 651 blood donors were examined four times or more frequently after 6-month intervals. 22.9% donors lacked antibodies (SFT and CFT) permanently, a rarely present low titre was recorded in another 22.9% donors, a repeated low titre in 43.6% and a repeatedly encountered medium or high titre in 10.6% of blood donors.

Animals↗
PubMed1975

[Diagnostic possibilities for the prevention and identification of intrauterine infections (author's transl)].

The demonstration of antibody titer movements in the hemagglutination inhibition test, in the complement fixation test and a differentiation between IgM and IgG antibodies allow information to be obtained on the age of an intra-uterine rubella infection. Specific IgM antibodies in neonates are reliable evidence, because the maternal IgM antibodies cannot cross the placenta. A rise in total IgM level in cord blood does not, on the other hand, indicate an embryopathy in every case. In contradistinction to rubella, cytomegaly and herpes simplex virus can be comparatively easily and quickly cultivated, so that identification of the virus is of use for clinical purposes. Of 2360 children investigated in our laboratory from 1969-1974, 120 certainly and 57 extremely probably showed rubella embryopathies.

Cytomegalovirus Infections↗
PubMed1977

A mixed outbreak of epidemic keratoconjunctivitis due to adenoviruses types 29 and 8.

An outbreak of epidemic keratoconjunctivitis (EKC) occurred in northern Bohemia in the summer of 1975. One hundred and four patients were treated. Four strains of adenovirus type 29 with low or strong pronounced cross-neutralization against anti-Ad 15 reference serum, and 2 adenovirus type 8 were isolated of 4 patients. Type 8 strains were only obtained from conjunctiva, type 29 also from stools. From one patient, type 8 from conjunctiva and type 29 from stool were isolated simultaneously. Out of 22 patients with demonstrable antibody rise, a monotypic response in virus-neutralization test against type 29 was detected in 13 and a mixed response against types 29 and 8 in nine. An antibody rise was most frequently demonstrated by virus-neutralization test, the frequence for VNT alone being equal to the frequency of antibody rise as detected by VNT, hemagglutination-inhibition test and complement-fixation test in combination.

Adenoviridae↗
PubMed1978

Agents affecting health of mother and child in a rural area of Kenya. XI. Antibodies against rotavirus in sera from children living in the Machakos District of Kenya.

207 sera from children under 5 years of age and living in the Machakos District in Kenya were tested in the Complement Fixation Test for antibodies against rotavirus. Two different antigens were used. The superiority of 'O' antigen over Nebraska calf diarrhoea virus antigen was confirmed. After a fall to 29 percent in the 6-8 months age group, the percentage of children with antibodies quickly rises with age to 80 percent at the age of 24 months and to practically 100 percent at the age of 30 months. This age-immunity curve suggests that the majority of children contract infections with rotavirus between 6 and 23 months of age. This is conform the pattern usually found in temperate climate countries.

Antibodies, Viral↗
PubMed1979

Serological studies on the antigenic relationship between herpes simplex virus and varicella-zoster virus.

If crossreacting antibodies between varicella-zoster virus (VZV) and herpes simplex virus (HSV) exist, one would expect more positive reactions with VZV in a group of HSV positive patients than in a group of HSV negative patients. This statement can only apply to a group of individuals where positive and negative reactions with respect to HSV and VZV are evenly distributed. Such a distribution can only be found among children. Therefore, the relationship between HSV-1 and VZV was the only one which was considered in this investigation, since the incidence of HSV-2 antibodies in children is very rare. The sera from 197 children were examined using the neutralization test (NT), the complement fixation test (CFT) and the indirect immunofluorescent assay (IFT) and could be classified as either HSV positive (80) or HSV negative (117). The children's ages were similar in both groups. Approximately the same proportion of VZV positive sera was found in both groups when examined using IFT (53% in the HSV positive and 47% in the HSV negative group). However, when the CFT was applied the proportion of VZV positive sera in the two groups differed markedly (22% of the HSV positive sera and 38% of the HSV negative sera). These findings suggest that crossreactivity observed between HSV and VZV in acute HSV and VZV infections is evidently not dependent on crossreacting antibodies but is apparently confined to the cellular level of the immune response.

Adolescent↗
PubMed1985

[Erythrocyte test preparations for standardizing fluorescent antibodies and the serological diagnosis of influenza].

An erythrocytic diagnostic preparation, obtained by the sandwich method and intended for the standardization of antivirus fluorescent antibodies (FA) and the determination of specific IgM in the blood sera of patients with a view to the early serological diagnosis of influenza, has been proposed. The loading of immunosorbents with influenza virus, achieved in this preparation, approaches its theoretical limit, the virions being arranged in a single layer, and constitutes up to 0.4 hemagglutinating units per 1000 red blood cells. The investigation made on 9 commercial and 4 experimental lots of FA has demonstrated that the newly developed test preparations serve as a convenient model for the standardization of FA and the choice of their optimum working dilution in practical diagnostic procedures. In the study of 153 paired blood sera from patients with acute respiratory diseases and clinically healthy persons the proposed variant of the early diagnosis of influenza has proved to be not inferior to the hemagglutination inhibition test and the complement fixation test with respect to the main characteristics of their diagnostic value, while having the advantage over these tests due to the fact that exact laboratory diagnosis can be made by the study of single blood samples as early as on the fourth day of the disease.

Animals↗