Protection against anthrax and plague by a combined vaccine in mice and rabbits.
The protective antigen (PA) of Bacillus anthracis and the Fraction 1 Capsular Antigen (F1 antigen), V antigen of Yersinia pestis have been demonstrated to be potential immunogens and candidate vaccine sub-units against anthrax and plague respectively. In this study, the authors have investigated the antibody responses and the protective efficacy when the antigens were administered separately or in combination intramuscularly formulation adsorbed to an aluminum hydroxide adjuvant. Results show that immunized rF1 + rV and rPA antigen together was as effective as separately for induction of serological antibody response, and these titers were maintained for over 1 year in mice. An isotype analysis of the serum indicates that the co-administration of these antigens did not influence the antigen-specific IgG1/IgG2a ratio which was consistent with a Th2 bias. Furthermore, the combined vaccine comprising the protein antigens rF1 + rV + rPA has been demonstrated to protect mice from subcutaneous challenge with 10(7) colony-forming units (CFU) virulent Y. pestis strain, and to fully protect rabbit against subcutaneous challenge with 1.2x10(5) colony-forming units (CFU) virulent B. anthracis spores. These data show that the protective efficacy was unaffected when the antigens were administered in combination.
Ren
Jun
J
State Key Laboratory of Pathogens and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 FengTai Dongdajie Street, Beijing 100071, PR China.
Dong
Dayong
D
Zhang
Jinlong
J
Zhang
Jun
J
Liu
Shuling
S
Li
Bing
B
Fu
Ling
L
Xu
Junjie
J
Yu
Changming
C
Hou
Lihua
L
Li
Jianmin
J
Chen
Wei
W
D000818:Animals; D000881:Anthrax / Q000276:immunology / Q000517:prevention & control*; D022122:Anthrax Vaccines / Q000276:immunology*; D000907:Antibodies, Bacterial / Q000097:blood; D057134:Antibodies, Neutralizing / Q000097:blood; D000942:Antigens, Bacterial / Q000276:immunology; D001426:Bacterial Proteins / Q000276:immunology; D001427:Bacterial Toxins / Q000276:immunology; D005260:Female; D007074:Immunoglobulin G / Q000097:blood; D051379:Mice; D008807:Mice, Inbred BALB C; D018832:Molecular Chaperones / Q000276:immunology; D009500:Neutralization Tests; D010930:Plague / Q000276:immunology / Q000517:prevention & control*; D010931:Plague Vaccine / Q000276:immunology*; D011817:Rabbits; D017778:Vaccines, Combined / Q000276:immunology
D022122:Anthrax Vaccines; D000907:Antibodies, Bacterial; D057134:Antibodies, Neutralizing; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D007074:Immunoglobulin G; D018832:Molecular Chaperones; D010931:Plague Vaccine; D017778:Vaccines, Combined; C030325:anthrax toxin; C070195:CAf1M protein, Yersinia pestis