The case-to-infection ratio refers to the number of cases of a disease in a population compared to the number of people infected with that disease. Other synonyms for this term include the incidence rate, prevalence rate, and infection rate. These terms are often used interchangeably in epidemiology to describe the occurrence and distribution of a disease in a population. The case-to-infection ratio is an important measure in public health as it helps to understand the magnitude of an outbreak and the effectiveness of interventions to control the spread of the disease. Accurate and timely reporting of these ratios is essential for effective disease surveillance and response.