What are the advantages of Immunohistochemistry over other Diagnostic methods?

Whenever the need to detect diseases in a population and to describe the pathogenesis of a disease (i.e., viral infection), diagnostic protocols may often calls for conducting immunohistochemistry. On this note, what are the advantages of Immunohistochemistry on characterizing a disease proces, albeit detecting (or confirming) a disease case, compared to other diagmostic tests or procedures (database protocol). Citing a meta-analysis reference will be greatly appreciated.

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