What is the term for the proportion of occurrences of a specific disease within a particular geographical area?

The correct term for the proportion of occurrences of a specific disease within a particular geographical area is "morbidity." Morbidity refers to the incidence or prevalence of a disease within a certain population or location, quantifying how many individuals are affected by the disease at a given time. This data is essential for public health officials as it helps in understanding the burden of the disease on a community and guiding health interventions.

The other terms listed do not fit this definition. Mortality pertains to the number of deaths caused by a disease, thereby focusing on the death rate rather than incidence. Risk typically relates to the likelihood of experiencing a particular health outcome or condition, rather than measuring how widespread the disease is. Virulence describes the severity or pathogenicity of a disease, indicating how harmful the disease can be but not its prevalence or incidence in a specific area. Thus, morbidity is specifically the measure that corresponds to the question's focus on the occurrence of disease within a geographical area.