*'''"Immune reseponses"''' contain various kinds of immunological functions, thus a single immune biomarker cannot necessarily be CoP
**Serum antibodies with multiple isotypes and multiple functions
**Mucosal antibodies with multiple isotypes and multiple functions
**Killer T cells
**Regulatory T cells
**Natural killer cells
**Phagocytes and antigen-presenting cells
**etc.
*'''Protection against infection''' is generally different from '''protection against disease'''
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<div class="toccolours mw-collapsible mw-collapsed" style==="margin-left:40px; max-width:650px; overflow:auto;">'''An example of measles===='''<div class="mw-collapsible-content" style="margin-left:40px">
{{Quote|content=
<div class="csl-entry">Chen, R. T., Markowitz, L. E., Albrecht, P., Stewart, J. A., Mofenson, L. M., Preblud, S. R., & Orenstein, W. A. (1990). Measles Antibody: Reevaluation of Protective Titers. In <i>The Journal of Infectious Diseases</i> (Vol. 162). https://doi.org/10.1093/infdis/162.5.1036</div>}}