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What is Diphtheria antibody titer considered optimally protective is and explain in detail?
Diphtheria antibody titer considered as optimally protective is >0.1 IU/ml. Titers of IgG antibody against diphtheria toxoid vaccine reflect various levels of protection against the disease as follows: <0.01 IU/ml: No protection 0.01 IU/ml: Basic protection >0.1 IU/ml: Optimal protection. Ref: Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; Pg; 245