A couple questions about human immunity?

If you can answer any it would be very helpful. Do helper T cells always activate cytotoxic T and plasma B cells during an infection? Or is it just with a viral infection? Are antibodies made against bacterial infections? What is the difference between an antigen and a mitogen exactly? Can macrophages... show more If you can answer any it would be very helpful.

Do helper T cells always activate cytotoxic T and plasma B cells during an infection? Or is it just with a viral infection?

Are antibodies made against bacterial infections?

What is the difference between an antigen and a mitogen exactly?

Can macrophages and other phagocytic cells present viral antigens?

What cells do dendritic cells present antigens to? Does it vary?

Thanks for any help I get!
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