case-to-infection ratio is a noun meaning "the number of cases of a disease divided by the number of infections with the agent that causes the disease". It carries one recorded sense.
the number of cases of a disease divided by the number of infections with the agent that causes the disease
Definitions, synonyms and semantic relations for case-to-infection ratio come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.