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In which of the following does the microbe never get completely eliminated, and exists in host tissues held in check by body defenses without causing signs and symptoms?

The term pathogen refers to 

The actual number of pathogenic microbes it takes to establish infection is called the infectious dose 50 (ID50)

Neisseria gonorrhoeae has antigenic variation which means

Central tolerance indicates that as lymphocytes mature, the ones that do not recognize self molecules 

Once a B cell is activated and proliferates into a clone, some differentiate into 

One T cell contains receptors for numerous different antigens.

The type of cell that stops the immune system from overreacting and responding to harmless substances is the 

The T helper cell that directs a response against multicellular pathogens by attracting eosinophils is

The actual cell that makes and releases antibodies is called a