Breakthrough Infection
An infection occurring in someone who is fully vaccinated.
CADR (Clean Air Delivery Rate)
A measure of an air purifier’s effectiveness.
Carrier State
A person harboring a pathogen without showing symptoms.
Case Control Study
An observational study comparing individuals with a disease to those without.
Case Definition
Criteria used to define and classify disease cases.
Case Fatality Rate (CFR)
The percentage of deaths among those diagnosed with a disease.
Case Reporting
Notifying public health authorities of disease cases.
CFR (Case Fatality Rate)
The proportion of deaths among confirmed cases of a disease.
Clean Air
Air free of pollutants, including viruses, bacteria, and harmful particles.
Cluster
A group of cases linked by time and place.
