Asymptomatic
A disease is considered asymptomatic if the host (human, animal or plant) is a carrier of the disease or infection but experiences or shows no symptoms.
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