Re-evaluation of the immunogenicity of meningococcal serogroups A and C polysaccharide vaccine among a healthy population aged 5 to 59 / 中华微生物学和免疫学杂志

Objective To re-evaluate the immunogenicity of meningococcal serogroups A and C polysaccharide vaccine among a healthy population of age 5 to 59.Methods Pre and post-vaccination ser-um samples were collected from the subjects involved in a randomized , controlled clinical trial conducted in 2005 at Hechi, Guangxi, China.Enzyme-linked immunosorbent assay (ELISA) was performed for the quan-titative detection of specific anti-capsule IgG antibody against meningococcal serogroups A and C in serum samples.Serum bactericidal assay ( SBA) was used to measure the bactericidal antibody activity against se-rougroups A and C bacterial strains .Results Geometric mean concentrations (GMCs) of specific anti-cap-sule IgG antibody were 23.66 μg/ml and 78.83 μg/ml for serogroup A (P0.05).The percentage of serum sam-ples with serogroup C-specific IgG concentration ≥2 μg/ml rose from 20%to 99% after vaccination ( P0.05), and from 14%to 96%for serogroup C (P<0.05) after vaccination.The rSBA GMTs with at least four times of in-creases after vaccination were detected respectively in 53% and 100% of serogroups A and C vaccinated subjects.Pearson correlation coefficient between IgG concentration and rSBA GMTs was r=0.15 (pre) and r=0.23 (post) for serogroup A, and r=-0.14 (pre) and r=0.58 (post) for serogroup C (P<0.05). Conclusion This study has demonstrated an efficient and sustained immunogenicity with meningococcal sero -groups A and C polysaccharide vaccine as evidenced by the data from standardized assays of ELISA and SBA .

Avaliação da resposta imunológica em animais quando inoculados com Neisseria Miningitidis dos grupos "A"e "C" / Evaluation of the immune response in animals when inoculated with Neisseria Miningitidis from groups "A" and "C"

Para o estudo do comportamento da resposta imune Neisseria Meningitidis dos grupos "A"e "C, fora feitas inoculação em quarenta coelhos e quatro carneiros, com bacterias vivas e mortas, bem como com polissacarídeos especificos dos grupos A e C com ou sem adjuvante, em diferentes doses e vias de inoculação. Foram feitas várias séries de inoculações para verificar o efeito secudário e terciário da resposta, bem como tipo de anticorpos envolvidos. O nível de anticorpos e a permanencia dos mesmos no soro foi medido através da reação de hemaglutinação passiva e da imunoeletroforese cruzada; esta última técnica foi utilizada nestes soros para detecção de antigenos polissacarídicos de N. animais quando com Meningitidis. A análise dos resultados obtidos mostra que não existe diferença nas respostas imunes, nas concentrações variadas de 5,6 x 107 a 2,4 x 10 10 bactérias por coelhos. Os anticorpos, tanto (AU).