Healthy adults (n=330) were randomized to receive either a bivalent vaccine composed of Vibrio cholerae CVD 103-HgR and Salmonella typhi Ty21a or a placebo. The combined vaccine was well tolerated. Approximately 80% of vaccines manifested a significant rise in anti-S. typhi immunoglobulin G or immunoglobulin A lipopolysaccharide antibody levels. Significant (fourfold or greater) rises in anti-Inaba or anti-Ogawa vibriocidal antibody titer were achieved by 94 and 80% of vaccine recipients, respectively. Elevated baseline vibriocidal antibody titers showed a modest suppressive effect on the rate of seroconversion.

Randomized, double-blind placebo-controlled trial to evaluate the safety and immunogenicity of combined Salmonella typhi Ty21a and Vibrio cholerae CVD 103-HgR live oral vaccines

The safety and immunogenicity of the live oral attenuated vaccine strains vibrio cholerae CVD 103-HgR and Salmonella typhi Ty21a were evaluated alone or in a combined bivalent formulation in four groups composed of 185 healthy European adults. All presentations were well tolerated. The serum anti-S. typhi lipopolysaccharide immunoglobulin G and immunoglobulin A antibody responses were comparable for all groups (66 to 72% seroconversion). The serum vibriocidal antibody seroconversion rate ranged from 78 to 92.5% (P > 0.05) among the groups. However, the peak and geometric mean vibriocidal antibody titers were significantly higher (P < 0.005) in the groups which received the bivalent formulation along with two doses of Ty21a than in the group which received CVD 103-HgR followed by two doses of killed Escherichia coli K-12 placebo. The ingestion of a placebo shortly after CVD 103-HgR may have suppressed the magnitude of the immune response. These findings demonstrate the feasibility of producing multivalent live oral attenuated vaccines.

Safety and immunogenicity of a live oral bivalent typhoid fever (Salmonella typhi Ty21a)-cholera (Vibrio cholerae CVD 103-HgR) vaccine in healthy adults.

More than 80% of all the worlds children have been covered by immunization. The scientific community must expand the range of communicable diseases covered by immunization programs and streamline vaccination procedures. Trans-disease vaccinology is a new immunology specialty aimed at improving vaccine efficiency and streamlining vaccine delivery systems. Genetic engineering is used to develop vaccines consisting of very attenuated harmless viruses or bacteria to transport antigens from a pathogen into the body. For example scientists can affix a gene or picked of DNA from a malaria parasite onto the cowpox virus. When the modified virus divides it makes the malarial protein. Engineering can also combine several key genes thus attacking the malaria parasite from different fronts. Another area of trans-disease vaccinology is incorporation of at least 1 gene designed to enhance the immune response in a transplanted gene package. For example scientists can transplant interleukin genes and vaccine genes into a live virus vector to induce immunity in animals with a weakened immune system. This type of vaccine would be helpful in countries with widespread malnutrition. Research in a single-shot vaccination involves controlling the release of antigens after injection thereby eliminating the need for a booster shot. Research needs to examine ways to invoke the immune response where it is most needed e.g. a cholera vaccine should target the intestines. WHO/UND Development Programme (UNDP) is testing group B and group A/C meningococcal vaccines to fight meningitis epidemics new measles vaccines for early infancy vaccines for diarrheal diseases and improved tuberculosis vaccines WHO/UNDP/WB coordinates research in vaccines for malaria and schistosomiasis. Various clinical trials of AIDS vaccines are underway. The leading obstacles for many pathogens is that they are capable of mutation and variation resulting in dodging immune defenses. The Childrens Vaccine Initiative centers on research and development.

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