Which of the following is not a feature of secondary immune respone to an antigen when compared to the first immune response to the same antigen?

Which of the following is not a feature of secondary immune respone to an antigen when compared to the first immune response to the same antigen? Correct Answer Antibody is generated without T-cell help

The features of the secondary immune response are: More antibodies are generated and the generation is fast. Antibody produced has a greater affinity for the antigen.

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When compared to the first immune response to the same antigen, which of the following is not a hallmark of the secondary immune response?
In an experiment you develop immune response in mice against salmonella flagellar antigen. However, you observe the infection still persisted. Which if a likely possibility if immune system is functioning properly?