Brown J, Farnsworth R, Wannamaker L W, Johnson D W
Infect Immun. 1974 Feb;9(2):377-83. doi: 10.1128/iai.9.2.377-383.1974.
Quantitative assay methods for CAMP factor activity of group B streptococci and for neutralization of this activity by animal sera are described. The course of the CAMP reaction is influenced by preincubation of red cells with staphylococcal beta-hemolysin and the rate of the reaction by the concentration of CAMP factor. The production of CAMP factor is enhanced by substitution of maltose for glucose in culture broth. Rising inhibitory titers to CAMP activity in sera of rabbits injected with sterile culture supernates of group B streptococci suggest that CAMP factor is an antigen in the rabbit. Cows with experimentally induced group B streptococcal mastitis also demonstrated significant rises in neutralizing titers for CAMP activity.
本文描述了B族链球菌CAMP因子活性的定量测定方法以及动物血清对该活性的中和作用。红细胞与葡萄球菌β-溶血素的预孵育会影响CAMP反应的进程,而CAMP因子的浓度则会影响反应速率。在培养基中用麦芽糖替代葡萄糖可增强CAMP因子的产生。给兔子注射B族链球菌无菌培养上清液后,其血清中对CAMP活性的抑制效价升高,这表明CAMP因子在兔子体内是一种抗原。实验性诱发B族链球菌乳腺炎的奶牛,其血清中对CAMP活性的中和效价也显著升高。