Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 17

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  immunoglobulina M
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The aim of the study was to investigate the level of IgM and IgG class antibodies, specific to selected pathogens in foals at particular stages during their nursing period. The tests were conducted in a thoroughbred stable. Twelve sera from mares and 12 sera from foals were examined and total protein and gamma globulin fraction levels were estimated as well as the relative level of specific antibodies in IgM and IgG class using the ELISA test and expressed as the value of optical density (OD) against the following strains of bacteria antigens: Staphylococcus sciuri (1), Staphylococcus sciuri (2), Staphylococcus sciuri (3), Staphylococcus xylosus (4), Staphylococcus xylosus (5), Staphylococcus aureus (6), Staphylococcus aureus (7), Streptococcus equi subsp. Zooepidemicus (8), Streptococcus equi subsp. Zooepidemicus (9), Enterobacter aglomerans (10), Rhodococcus equi (11), Salmonella enterica ser Typhimurium (12). Traces of specific Ig R. equi were indicated in the foals sera before suckling whereas the OD value increased to 0.35 in sera following the absorption of colostrum. The profile of specific humoral response against environmental pathogens in nursing foals is dependent not only on antigenic moiety of the pathogen but also on the immunological status of the individual.
Antibodies (immunoglobulins, Ig) were first discovered in mammals, as IgM, IgD, IgG, IgE and IgA. These molecules are responsible for humoral immunity. The reptiles are the last major group of vertebrates in which the organization of the IgH locus and its encoded Ig H chain isotypes has not been well characterized. The reptile expresses three Ig H chain isotypes (IgM, IgD and IgY). The presence of the delta gene demonstrates an evolutionary continuity of IgD. Interestingly. A new study of the leopard gecko shows the presence of a gene that is the orthologue of IgA and IgX.
Sera of 51 cows, including 8 cows with a nodular form of epizootic bovine leukemia, from cowsheds of a high percent of BLV infection (more than 80%) and their foetuses have been examined. The presence and content of IgG, IgM and IgA in sera of cows and their foetuses was determined by the method of a radial single immunodiffusion using standard kits (Miles). The highest content of IgG (1946 mg/100 ml) was noted in sera of cows with a subclinic form of leukemia and the lowest one (1579 mg/100 ml) in seropositive cows. However, these differences were not statistically significant. The level of serum IgM was significantly higher in healthy cows (536 mg/100 ml) and in sera of seropositive cows (486 mg/100 ml) comparing to cows with a permanent lymphocytosis (419 mg/100 ml) and with histopathological lesions (446 mg/100 ml). The content of IgA ranged in all groups from 57 to 60 mg/100 ml. In a group of foetuses from cows with a permanent lymphocytosis the level of serum IgM was higher (13.9 mg/100 ml) comparing to other groups (16.5—17.6 mg/100 ml). A slightly higher level of all immunoglobulin classes was observed in seropositive foetuses against EBL.
Immunocapture assays ISAGA PLUS IgA/IgM (bioMerieux) and IgE ISAGA were used to determine their usefulness in the diagnosis of acquired and congenital toxoplasmosis. Specific IgM, IgA and IgE antibodies were tested in 134 patients, namely pregnant women who seroconverted during gestation (n= 20), children with congenital toxoplasmosis (n= 5), patients with toxoplasmic lymphadenitis (n= 56) and immunocompetent individuals with chronic Toxoplasma gondii infection (n= 53). Altogether 172 sera were examined. Specific IgM antibodies were detected in all sera from pregnant women (100%) with recent T. gondii infection (1- 8 weeks after seroconversion), in all patients with toxoplasmic lymphadenopathy (1-3 months after onset of symptoms) and in their control examinations after 2 and 5 months (100%) and also in 35 (66%) out of 53 patients with chronic infection. In infants with congenital toxoplasmosis IgM were found only in one new-born; equivocal results were obtained in 3 children during the asymptomatic serological reactivation in the second year of life. Specific IgA antibodies were present in sera from 15 (75%) out of 20 women seroconverted during pregnancy; in 3 cases the results were equivocal. IgA antibodies were detected in sera from 30 (81.1%) out of 37 patients with toxoplasmic lymphadenitis examined once; in 19 patients examined 3 times IgA antibodies were present in all the cases in the first serological examination performed when clinical symptoms were first observed (100%), in 17 patients after 2 months (89.5%) and in 11 patients after 5 months (57.9%). IgA antibodies were also detected in 21 sera (39.6%) from patients with chronic T. gondii infection. In children with congenital toxoplasmosis IgA antibodies were found in 3 cases during serological reactivation after discontinuation of pyrimethamine-sulfadiazine therapy; in these cases equivocal results of IgM antibodies were present, and positive result of IgE antibodies in one case. Specific IgE antibodies were detected in sera from 17 (85%) out of 20 women with seroconversion and in 18 patients with lymphadenopathy (32.1%); in the last group IgE antibodies were not present in the follow-up examination after 5 months. IgE antibodies were detected only in 5 cases (9.4%) with chronic infection. IgA and IgE antibodies in ISAGA begin to appear about a week later than IgM antibodies; in sera collected between the 2nd and 3rd week after invasion the positive results were obtained in all cases (100%). Therefore, ISAGA PLUS IgA/IgM (bioMerieux) is useful for the diagnosis of recent T. gondii infection especially in women with suspected seroconversion during pregnancy. ISAGA PLUS IgA/IgM is more sensitive than any conventional method routinely used and so far is a specially eflicient technique for newborns and infants suspected for congenital infection and/or in diagnosing congenital toxoplasmosis during immunological recrudescence. This test has a limited value in toxoplasmosis with lymphadenopathy by reason of possibility of a long persistence of IgM and IgA antibodies detected by ISAGA. Detection of specific IgE antibodies using ISAGA technique may be useful for differential diagnosis of acute and chronic phase of T. gondii infection and also in some cases of serological reactivation of congenital toxoplasmosis.
The aim of the study was to isolate the most common pathogenic strains from calves, cows and the environment, as well as estimating the intensity of (OD) of IgG₁, IgG₂ and IgM reactions to those microorganisms. The study was held in a large commercial dairy farm over the course of 1 year, and included 100 calves and their mothers. OD of IgG₁, IgG₂ and IgM to bacteria isolated from cows, calves and the environment were examined in the investigated serums using the ELISA test. Higher levels of OD were obtained in relation to Salmonella Dublin, Pasteurella multocida, Escherichia coli O26 K6 and Haemophilus som. The above bacteria were also considered to be the most dangerous microorganisms for young calves in the studied farm.
Occurrence of Pneumocystis carinii DNA aod anti-Pneumocystis antibodies in sera of infants at the age of humoral response natural degradation. The polymerase chain reaction (PCR) and indirect immunofluorescent test (IF) were used for examination of serum samples obtained from infants with respiratory tract infections. Sixty (11,9%) out of the 503 examined infant samples were positive for anti-P. carinii IgM and 354 (70,4%) contained anti-Pneumocystis IgG. P. carinii DNA was found in 6 (6,7%) sera from 90 of infected infants. Five out these 6 samples were for anti-Pneumocystis antibodies positive; 4 contained both IgG and IgM classes and one bad only IgG. The sixth sample had neither IgG nor IgM, despite of P. carinii DNA presence. The results of the studies indicated that for diagnosis Pneumocystis carinii pneumonia (PCP) in infants on serum specimens detection of antibodies by IF test is of greater value than Pneumocystis DNA amplification by PCR method.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.