Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0043167 (pertussis)
 19,595 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Injection of certain cellular constituents of mycobacteria into mice simultaneously with, or shortly after, infection with Staph. aureus or with Myco. fortuitum, markedly shortened the life of the infected animals. This infection-enhancing effect could be achieved by injecting the cellular constituents by either the intravenous, the intraperitoneal, or the subcutaneous route. Suspensions of killed mycobacteria were injected into mice which had been infected several months before with small doses of various bacterial pathogens and which still harbored small numbers of living organisms in their organs. Under these conditions, a marked increase in the numbers of living bacteria in the organs of the treated mice could be detected within a very few days after treatment with the mycobacterial products, and a certain percentage of the animals died rapidly. One of the first and most constant manifestations of the change in the infectious process from the chronic to the acute state was the appearance of a large microbial population in the liver. This happened even though Staph. aureus and Myco. fortuitum are rapidly cleared from the liver of normal mice. In addition to killed cells of BCG and of Myco. fortuitum, pertussis vaccine and the purified lipopolysaccharide (endotoxin) of Gram-negative bacilli also proved capable of converting chronic bacterial infections into acute infectious processes.
 ...
PMID:Effects of cellular constituents of mycobacteria on the resistance of mice to heterologous infections. II. Enhancement of infection. 1347 26

Infant immunization is the most cost-effective strategy to prevent infectious diseases in childhood, but is limited by immaturity of the immune system. To define strategies to improve vaccine immunogenicity in early life, the role of genetic and environmental factors in the control of vaccine responses in infant twins was studied. Immune responses to BCG, polio, hepatitis B, diphtheria, pertussis and tetanus vaccines were measured at 5 months of age in 207 Gambian twin pairs recruited at birth. Intrapair correlations for monozygous and dizygous pairs were compared to estimate the environmental and genetic components of variation in responses. High heritability was observed for antibody (Ab) responses to hepatitis B (77%), oral polio (60%), tetanus (44%) and diphtheria (49%) vaccines. Significant heritability was also observed for interferon-gamma and interleukin-13 responses to tetanus, pertussis and some BCG vaccine antigens (39-65%). Non-HLA genes played a dominant role in responses to Ab-inducing vaccines, whereas responses to BCG were predominantly controlled by genes within the HLA class II locus. Genetic factors, particularly non-HLA genes, significantly modulate immune responses to infant vaccination. The identification of the specific genes involved will provide new targets for the development of vaccines and adjuvants for young infants that work independently of HLA.
 ...
PMID:Genetic regulation of immune responses to vaccines in early life. 1473 96

In order to develop a combined recombinant Mycobacterium bovis BCG (rBCG) vaccine against diphtheria, pertussis and tetanus (DPT), we have constructed different strains of rBCG expressing tetanus toxin fragment C (FC), driven by the up-regulated M. fortuitum beta-lactamase promoter, pBlaF*. Tetanus toxin FC was expressed in comparable levels in native form or in fusion with the beta-lactamase exportation signal sequence; however, in both constructs it was localized to the cytosol. Immunization of mice with rBCG-FC or its combination with rBCG expressing CRM197, induced anti-tetanus toxin antibodies with a Th2 immunoglobulin profile. Administration of a subimmunizing dose of the diphtheria-tetanus toxoid vaccine showed that rBCG-FC primed mice for production of an intense humoral response. Interestingly, the combination of rBCG-FC and rBCG-CRM197 reduced the time required for maturation of the immune response and increased anti-tetanus toxin antibody levels, suggesting adjuvant properties for rBCG-CRM197; this combination induced 75% protection in mice challenged with 100 minimum lethal doses (MLD) of tetanus toxin. Antisera from guinea pigs immunized with this combination were shown to neutralize tetanus toxin and diphtheria toxin. Our results suggest reciprocal adjuvant effects of rBCG-FC and rBCG-CRM197, which may contribute to induction of a more effective immune response against both diseases.
 ...
PMID:Adjuvant activity of Mycobacterium bovis BCG expressing CRM197 on the immune response induced by BCG expressing tetanus toxin fragment C. 1474 Nov 67

Beta-Lactoglobulin (BLG) is a clinically important antigen in cow's milk and one of the major allergens causing cow's milk allergy. Bacillus Calmette-Guerin (BCG) vaccination has been suggested to modify immune response possibly decreasing the risk of allergy to some antigens in both human and experimental animals. In the present study, we have analyzed whether the early BCG vaccination has any effect on the markers of systemic and gastrointestinal (GI) sensitization to BLG. We immunized two groups of Hooded-Lister rat puppets with intraperitoneal injections of native BLG at 43 and 62 days with pertussis vaccine as adjuvant, one group receiving additionally BCG. The animals were then fed native and denatured milk products twice weekly from 73 to 131 days of age, when they were killed. Control group was not vaccinated and received normal rat forage. Total immunoglobulin E (IgE) levels and BLG-specific IgG(1) and IgG(2a) concentrations were determined in serum samples. Spontaneous interleukin (IL)-4 and interferon (IFN)-gamma production from duodenal specimens were measured, and the inflammatory cells were quantitated in specimens from different sections of the GI tract. Administration of BCG simultaneously with BLG resulted in reduced IgE concentration in serum, while the specific IgG(1) and IgG(2a) antibody responses and the spontaneous secretion of IL-4 and IFN-gamma were not affected. Furthermore, BCG-induced eosinophilic infiltration and increase of intraepithelial lymphocytes (IEL) in the GI mucosa, and a trend toward increased number of lamina propria mononuclear inflammatory cells in the colon (BCG compared with BLG, p = 0.09; BCG compared with controls, p = 0.02). Controls showed increment of IgG(1) response in comparison with the BLG group (p = 0.04) and increase of mucosal eosinophilic infiltration. The BCG modified the response to BLG both at the systemic level as shown by decrease of total IgE and at GI mucosa where increase of eosinophilic infiltration and increased number of IEL were seen. Increment of IgG(1) level and eosinophils in the controls might be related with the lack of modulatory effect of pertussis vaccination. A shift of response toward the lower GI tract after BCG immunization as shown by a trend for increase of mononuclear inflammatory cells in colon lamina propria mimics disease development in some cases of clinical food allergy, and emphasizes the need for evaluation of the changes in the whole GI tract in food allergy models.
 ...
PMID:BCG vaccine modulates intestinal and systemic response to beta-lactoglobulin. 1548 15

Two recombinant Mycobacterium bovis BCG (rBCG) vaccine strains were developed for the expression of cytoplasmically located S1 subunit of pertussis toxin, with expression driven by the hsp60 promoter of M. bovis (rBCG/pPB10) or the pAN promoter of Mycobacterium paratuberculosis (rBCG/pPB12). Both strains showed stable expression of equivalent levels of recombinant S1 in vitro and induced long-term (up to 8 months) humoral immune responses in BALB/c mice, although these responses differed quantitatively and qualitatively. Specifically, rBCG/pPB12 induced markedly higher levels of IgG1 than did rBCG/pPB10, and mice immunized with the former strain developed specific long-term memory to S1, as indicated by the production of high levels of S1-specific IgG in response to a sublethal challenge with pertussis toxin 15 months after initial immunization. When considered in combination with previous studies, our data encourage further evaluation of rBCG as a potential means of developing a low-cost whooping cough vaccine based on defined antigens.
 ...
PMID:Induction of humoral immunity in response to immunization with recombinant Mycobacterium bovis BCG expressing the S1 subunit of Bordetella pertussis toxin. 1646 59

An increasing number of internationally adopted children is coming to Italy, and their immunization status is unknown. We evaluated the immunization status of such children in Palermo, Italy. We searched for the presence of a BCG scar in 88 children, 49 boys and 39 girls (mean age 76+/-32 months), most of whom (98%) came from Eastern Europe. Presence of BCG scar was observed in 59 (67.1%) of them, included five children without any pre-adoptive medical records. Twenty-three out of 29 children without any evidence of BCG scar were tested by Mantoux. Seven (30.4%) of 23 were tuberculin positive and diagnosed as having latent tuberculosis infection. We also examined immunization status against poliovirus 1-3, tetanus, diphtheria, pertussis, measles, mumps, rubella and hepatitis B of 70 internationally adopted children and we compared it with the pre-adoptive immunization records of their birth country. Protective titers (>1:8) against poliovirus 1-3, were found respectively in 67.1%, 91.4%, 42.8% of 70 immunized children, and only 38.5% of them had at the same time full protection against all three types of poliovirus. Protective titers against tetanus and diphtheria were found in 91.4% and 95.7% of 70 vaccinated children. Presence of antibodies against pertussis, measles, mumps and rubella was observed respectively in 16 (32.6%) of 49, 40 (62.5%) of 64, 28 (56%) of 50 and 24 (85.7%) of 28 children who had received the vaccine. As regards hepatitis B, only 20 of 29 vaccinated children had detectable hepatitis B surface antibodies, while four of 29 vaccinated and two of 41 not vaccinated children were positive for both hepatitis B surface antibodies and hepatitis B core antibodies. Finally three of 41 not vaccinated children were both hepatitis B surface antigen and hepatitis B core antibodies positive. No relation was found between health status and immunization and between age and antibody positiveness of vaccinated children except for hepatitis B, therefore the youngest immunized children were more likely to be hepatitis B surface antibodies positive. Our data suggest that internationally adopted children should be tested for their immunization status on arrival in the adopting country, because they are not protected in a sufficient way against vaccine-preventable diseases and their pre-adoptive immunization records sometimes are lacking and frequently are scarcely reliable.
 ...
PMID:Immunization status of internationally adopted children in Italy. 1654 5

Bordetella pertussis adenylate cyclase (CyaA) toxoid is a powerful nonreplicative immunization vector targeting dendritic cells, which has already been used successfully in prophylactic and therapeutic vaccination in various preclinical animal models. Here, we investigated the potential of CyaA, harboring strong mycobacterial immunogens, i.e., the immunodominant regions of antigen 85A or the complete sequence of the 6-kDa early secreted antigenic target (ESAT-6) protein, to induce antimycobacterial immunity. By generating T-cell hybridomas or by using T cells from mice infected with mycobacteria, we first demonstrated that the in vitro delivery of 85A or ESAT-6 to antigen-presenting cells by CyaA leads to processing and presentation, by major histocompatibility complex class II molecules, of the same epitopes as those displayed upon mycobacterial infection. Importantly, compared to the recombinant protein alone, the presentation of ESAT-6 in vitro was 100 times more efficient upon its delivery to antigen-presenting cells in fusion to CyaA. Immunization with CyaA-85A or CyaA-ESAT-6 in the absence of any adjuvant induced strong antigen-specific lymphoproliferative, interleukin-2 (IL-2) and gamma interferon (IFN-gamma) cytokine responses, in the absence of any IL-4 or IL-5 production. When used as boosters after priming with a BCG expressing ESAT-6, the CyaA-85A and CyaA-ESAT-6 proteins were able to strikingly increase the sensitivity and intensity of proliferative and Th1-polarized responses and notably the frequency of antigen-specific IFN-gamma-producing CD4+ T cells. However, immunization with these CyaA constructs as subunit vaccines alone or as boosters did not allow induction or improvement of protection against Mycobacterium tuberculosis infection. These results question the broadly admitted correlation between the frequency of IFN-gamma-producing CD4+ T cells and the level of protection against tuberculosis.
 ...
PMID:An increase in antimycobacterial Th1-cell responses by prime-boost protocols of immunization does not enhance protection against tuberculosis. 1655 42

An essential role for zinc in development of the fetal immune system has been documented. However, the effect of antenatal zinc supplementation on infants' postnatal immune response to vaccinations is unknown. The objective of this study was to evaluate the effect of zinc supplementation during pregnancy on immune response to the Bacillus Calmette-Guerin (BCG) vaccine and the Haemophilus influenzae type b (Hib) component of the combined diphtheria, tetanus toxoid and pertussis (DTP)-Haemophilus influenzae type-b (Hib)- conjugate vaccine in poor Bangladeshi infants. We immunized 405 infants whose mothers were supplemented daily with 30 mg elemental zinc or placebo beginning at 12-16 weeks gestation with the standard BCG vaccine at birth. A subcohort of 203 infants were in addition immunized at 1-month intervals with three doses of DTP-Hib vaccine starting at 9 weeks of age. The delayed hypersensitivity (PPD) skin test was performed in 345 infants at 24 weeks of age. Hib polysaccharide (PRP) antibodies were assessed for 91 infants at 4 and 24 weeks of age. In infants born with low birth weight (LBW) a lower proportion of negative responses to PPD skin test were observed in the zinc (66.2%) compared to placebo (78.5%) group (p = 0.07). No differences were observed in normal birth weight infants. There were no differences in proportion of infants above the protective thresholds for anti-PRP antibodies between zinc (81%) and placebo (89%) group. Geometric mean PRP antibody titres at 4 and 24 weeks of age were not different between groups. Zinc supplementation during pregnancy did not enhance immune response to Hib-conjugate vaccine but there was a suggestion of improved delayed hypersensitivity immune responses to BCG-vaccine in Bangladeshi LBW infants.
 ...
PMID:The effect of zinc supplementation during pregnancy on immune response to Hib and BCG vaccines in Bangladesh. 1662 58

TB10.4 is a newly identified antigen of Mycobacterium tuberculosis recognized by human and murine T cells upon mycobacterial infection. Here, we show that immunization with Mycobacterium bovis BCG induces a strong, genetically controlled, Th1 immune response against TB10.4 in mice. BALB/c and C57BL/6 strains behave as high and low responders to TB10.4 protein, respectively. The TB10.4:74-88 peptide was identified as an immunodominant CD4+ T-cell epitope for H-2d mice. Since recent results, as well as the present study, have raised interest in TB10.4 as a subunit vaccine, we analyzed immune responses induced by this antigen delivered by a new vector, the adenylate cyclase (CyaA) of Bordetella pertussis. CyaA is able to target dendritic cells and to deliver CD4+ or CD8+ T-cell epitopes to the major histocompatibility complex class II/I molecule presentation pathways, triggering specific Th1 or cytotoxic T-lymphocyte (CTL) responses. Several CyaA harboring either the entire TB10.4 protein or various subfragments containing the TB10.4:20-28 CTL epitope were shown to induce TB10.4-specific Th1 CD4+ and CD8+ T-cell responses. However, none of the recombinant CyaA, injected in the absence of adjuvant, was able to induce protection against M. tuberculosis infection. In contrast, TB10.4 protein administered with a cocktail of strong adjuvants that triggered a strong Th1 CD4+ T-cell response induced significant protection against M. tuberculosis challenge. These results confirm the potential value of the TB10.4 protein as a candidate vaccine and show that the presence of high frequencies of CD4+ T cells specific to this strong immunogen correlates with protection against M. tuberculosis infection.
 ...
PMID:High frequency of CD4+ T cells specific for the TB10.4 protein correlates with protection against Mycobacterium tuberculosis infection. 1671 70

A survey was conducted in Dhaka District to measure the level of routine immunization coverage of children (12-23 months), to assess the tetanus toxoid (TT) immunization coverage among mothers of children (12-23 month), to evaluate EPI program continuity (dropout rates) and quality (percent of Invalid doses, vaccination card availability etc.) For this purpose, a thirty cluster cross-sectional survey was conducted in October 2002 to assess the immunization coverage in Dhaka. In this survey 30 clusters were randomly selected from a list of villages in 63 Unions of Dhaka following probability proportion to size (PPS) sampling procedure. A total of 210 children was studied using pre-tested structured questionnaire. Descriptive statistics was employed using software SPSS package for data analysis. The study showed that the routine immunization coverage in Dhaka among children by 12 months of age by card + history was 97% for BCG, 97% for Diphtheria, Pertussis Tetanus (DPT 1) and Oral Polio Vaccine (OPV 1), 75% for DPT3 and OPV3 and 67% for measles. Sixty six percent of all children surveyed had received valid doses of all vaccines by 12 months (fully immunized child). Programme access as measured by crude DPT1 coverage was better in Keranigonj (97%). Vaccination cards retention rate for children was 84%. Invalid DPT (1,2 or 3) doses were given to 25% of vaccinated children; 18% of measles doses were invalid. Surprisingly, major cause for invalid doses were not due to early immunizations or due to card lost but for giving tick in the card, instead of writing a valid date. DPT1 and DPT3 and DPT1- Measles drop out rates were 5% and 13% respectively. Major reason parents gave for never vaccinating their children (zero dose children) was (43%), major reasons for incomplete vaccination was lack of knowledge regarding subsequent doses (46%). TT surveys were also conducted for mothers of the children surveyed for vaccination coverage (mothers between 15-49 year old). Valid TT 1-5 coverage by card+ history was 97%, 55%, 44%, 24% and 11%, respectively. Card retention rate for TT was 67%. The findings of this study revealed that access to child and TT immunizations were good. But high dropouts and invalid doses reduced these percentages of fully immunized child to 66%. Programmatic strategy must be undertaken to reduce the existing high dropout rate in both child and TT immunizations.
 ...
PMID:Vaccination coverage survey in Dhaka District. 1696 9


<< Previous 1 2 3 4 5 6 7 8 9 10