Immunogenicity of a new Salmonella Typhi Vi polysaccharide vaccine--vax-TyVi--in Cuban school children and teenagers.
A randomized, controlled, double blind study was carried out in Cuban children and teenagers aged 9-13 years to evaluate the immunogenicity of vax-TyVi-Salmonella Typhi Vi polysaccharide vaccine-with respect control vaccines. Serum samples were taken before and 21 days after the immunization, and ELISA was used for the determination of antibodies to Vi polysaccharide. Subjects who received vax-TyVi and TYPHIM Vi (Pasteur-Mérieux) showed seroconversion rates of 85.61 and 78.36%, respectively. The geometric mean titer (GMT) values for Vi antibodies induced after vaccination were 6.27 microg/ml (5.40-7.38 microg/ml) and 5.97 microg/ml (5.01-7.10 microg/ml), respectively. In contrast, subjects receiving the tetanus toxoid vaccine showed 0% seroconversion.
Azze
Rolando Felipe Ochoa
RF
Instituto Finlay, DACTA, Avenida 27 No. 19805, La Lisa, AP 16017, CP 11600 Ciudad de La Habana, Cuba. ochoa@finlay.edu.cu
Rodríguez
Juan Carlos Martínez
JC
Iniesta
Mónica Ginebra
MG
Marchena
Xenia Rosa Ferriol
XR
Alfonso
Vivian María Rodríguez
VM
Padrón
Franklin Tomás Sotolongo
FT
D000293:Adolescent; D000907:Antibodies, Bacterial / Q000097:blood; D002648:Child; D003462:Cuba / Q000453:epidemiology; D004311:Double-Blind Method; D006801:Humans; D007273:Injections, Intramuscular; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D012485:Salmonella typhi / Q000276:immunology*; D014435:Typhoid Fever / Q000453:epidemiology / Q000276:immunology / Q000517:prevention & control; D014436:Typhoid-Paratyphoid Vaccines / Q000008:administration & dosage / Q000009:adverse effects / Q000276:immunology*; D014611:Vaccination
D000907:Antibodies, Bacterial; D011135:Polysaccharides, Bacterial; D014436:Typhoid-Paratyphoid Vaccines