Time period before a diagnostic test can detect the presence of a disease. An individual may still be infectious during this period of time.


Intervention to reduce the risk of exposure or the susceptibility (likelihood of getting infected with a pathogen after exposure) of an individual to a pathogen.


A measure of the immune response (antibody titre) of an individual against a pathogen, based on a 50% reduction in disease upon exposure to infection. When an individual is seroprotected, there is at least moderate (50%) chance that the individual is clinically protected against the disease.


Measures taken to reduce the likelihood of getting infected after exposure, or methods employed to lessen the severity of the disease after getting infected.