different between serology vs seroprevalent

English

sero- +? -logy

serology (countable and uncountable, plural serologies)

The science that studies the blood serum, and especially the reaction between antigens and antibodies in serum.
The characteristics of the blood serum in a particular disease or organism.
(countable, informal) A blood test to detect the presence of, and often to measure the amount of, various components of the serum (such as electrolytes, antibodies, and antigens).

sero- +? prevalent

seroprevalent (comparative more seroprevalent, superlative most seroprevalent)

(medicine) That gives a positive response to a blood test for a specific disease

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