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The prevalence of maternal antibodies (Abs) and an immature neonate immune system, which is inclined to a T-helper 2 (Th2) response, are factors that counteract active immunization in early life. In a mouse model, the maternal influence on an active immunization of 2-day-old offspring with Sendai virus (SV) envelope proteins was explored. Maternal immunizations were conducted with the same SV antigen...
Three different prime-boost immunization protocols were tested in rabbits and their immune response was evaluated and compared with the final aim of identifying a vaccine strategy that might be able to protect non-human primates from infection with the pathogenic chimera simian/human immunodeficiency virus (SHIV) 89.6P . Protocols were based on priming with two fowlpox...
Aims: To estimate Haemophilus influenzae type b (Hib) disease burden in Fiji in children under the age of 5 years (under-5s) prior to vaccine introduction. To compare estimates from WHO's Hib rapid assessment tool (RAT), with that from decline in disease after vaccine introduction.Methods: Laboratory data (meningitis), hospitalization and mortality data (pneumonia and meningitis) before and after...
To investigate the immunogenicity of plasmid DNA encoding dog zona pellucida glycoprotein-3 (dZP3), the cDNA corresponding to dZP3, was cloned in mammalian expression vector VR1020 downstream of tissue plasminogen activator signal sequence under cytomegalovirus promoter (VRdZP3). In vitro transfection of COS-1 mammalian cells with VRdZP3 plasmid DNA led to its cytosolic expression. The expressed dZP3...
A serogroup B meningococcal outer membrane vesicle (OMV) vaccine was delivered either intranasally or intramuscularly to 12 and 10 volunteers, respectively. The mucosal vaccine was given as four weekly doses followed by a fifth dose after 5 months; each dose consisted of OMVs equivalent to 250μg of protein. The intramuscular (i.m.) vaccine, consisting of the same OMVs but adsorbed to Al(OH) 3...
Despite the availability of safe and effective rabies vaccines, the incidence of dog rabies has been increasing throughout much of sub-Saharan Africa. Here we describe a vaccination strategy that has resulted in successful control of rabies in a rural dog population of Northwestern Tanzania. From October 1996 to February 2001, four central-point dog vaccination campaigns were conducted in villages...
The immune response induced by a DNA construct expressing the E2 envelope glycoprotein of bovine viral diarrhoea virus (BVDV) was studied in cattle. Four groups of five calves, were immunised by intradermal injection with a total of 1mg of plasmid DNA on each of two occasions, with a 3-week dose interval. Group 1 received non-coding plasmid DNA only (control), group 2 received the E2 coding plasmid...
Protective immunity against Streptococcus pyogenes can be induced by intranasal vaccination with the fibronectin-binding domain (H12 fragment) of the fibronectin-binding protein I (SfbI) co-administered with the B subunit of the cholera toxin (CTB) as mucosal adjuvant. However, intranasal administration of A-B moiety bacterial toxins or their derivatives has been associated with potentially severe...
As part of an ongoing effort to develop a vaccine against Leishmania mexicana, we tested DNA vaccines encoding L. mexicana GP63, CPb, and LACK, and L. amazonensis GP46, to evaluate this strategy and define the best antigen candidates. Immune responses and vaccine efficacy were evaluated in BALB/c mice immunized with plasmid DNA encoding the different antigens. All four DNA vaccines induced Leishmania-specific...
Applicability of the endotoxin test to diphtheria-tetanus-acellular pertussis combined (DTaP) vaccines was examined. We found some DTaP vaccines that strongly interfered with Limulus amoebocyte lysate (LAL) activity of endotoxin without affecting lethal activity of endotoxin in d-galactosamine-treated mice. LAL activity that was interfered in such vaccines increased apparently after the treatment...
The purpose of the NIAID/FDA joint workshop, ''correlates of immunity for pneumococcal conjugate vaccines (PCVs),'' was to discuss the present understanding of protective immunity against invasive pneumococcal disease and identify in vitro measures that may represent immunologic correlates in future clinical trials. Animal and clinical data support functional antibody as the basis for protection,...
Hepatitis B is a serious cause of mortality and morbidity worldwide. The prevalence of hepatitis B surface antigen in Iran is about 1.7% but little is known about the high-risk occupations. This study was conducted to investigate the prevalence of HBsAg and assess risk factors of infection in Iran's large vehicle drivers as a high-risk group. The population studied included 1113 large vehicle drivers...
An on-going Streptococcus pneumoniae surveillance in Uruguay furnished national information on serotype distribution of isolates from invasive infections in children =<5 years. The adequacy of 7-, 9- and 11-valent conjugate vaccine formulations was evaluated, in comparison with the prevalence of the serotypes causing disease in this target population. From 1994 to 2001, 506 isolates were submitted...
Secreted recombinant sialoglycoprotease fusion protein (Gcp-F) of Mannheimia (Pasteurella) haemolytica A1 was examined for its ability to protect cattle from experimental challenge with M. haemolytica A1. Five M. haemolytica vaccines were compared including Gcp-F, logarithmic phase culture supernate (Presponse ( R)) and Presponse ( R) enriched with Gcp-F, recombinant leukotoxin (rLkt)...
Gene-based and protein-based vaccines are two distinct types of vaccines. In this report, we examined if combined use of DNA and protein vaccines would increase their own abilities to induce neutralizing antibody in murine models for Japanese encephalitis (JE) or dengue type 2 (DEN2). DNA vaccines for JE (pcJEME) or DEN2 (pcD2ME) were inoculated intramuscularly, and protein vaccines consisting of...
The objective of this study was to measure the effect of two variables (pig age and virus strain) on selected responses (clinical signs, viraemia, virus excretion and seroconversion) of pigs following exposure to porcine reproductive and respiratory syndrome (PRRS) virus. Therefore, young (6 till 8 weeks old) and old (6 months old) pigs were infected with 3 different PRRSV strains, i.e. LV ter Huurne...
An effective vaccination strategy against human immunodeficiency virus type 1 (HIV-1) should include the induction of potent cellular immune responses against conserved HIV-1 antigens. We have generated five replication competent recombinant influenza viruses (rFlu/SIV Gag nos. 1-5) expressing different portions of Gag of simian immunodeficiency virus (SIV). Single intranasal immunizations in mice...
The study of antigen specific IgG subclass distribution during disease, or during any other natural or artificial immunisation, can provide useful information on the kind of the immune response and the expected levels of protection. This is particularly true for diseases, such as pertussis in which the mechanisms underlying specific defence are still not completely understood. An investigation was...
Objective: To assess the efficacy and safety of whole-cell and acellular pertussis vaccines administered to children singly or within diphtheria, tetanus and pertussis (DTP) vaccines. Data sources: We searched the Cochrane Library, MEDLINE, EMBASE, Biological Abstracts and Science Citation Index to December 2001. Specialised websites and bibliographies of retrieved articles and reviews were assessed...
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