An infection, or phase of infection, without readily apparent symptoms or signs of disease.
An infection with few or no obvious symptoms
The presence of infection without symptoms. Also known as inapparent or asymptomatic infection.
a low-grade asymptomatic infection.
Infection without any apparent symptoms
In medicine, a subclinical infection refers to an inapparent, asymptomatic infection, or an infection that has such a mild course that it doesn't alert the patient enough to consult with a physician.