Incidence
Number of new cases of illness commencing, or of persons falling ill, during a given period in a specific population: usually expressed as a rate.
Glossary Source
JRC EU CBRNe Glossary
(
EU Glossary on Chemical, Biological, Radiological, Nuclear, and Explosive risks
)
https://publications.jrc.ec.europa.eu/repository/bitstream/JRC128863/JRC128863_01.pdf