GC: n
S: WHO – https://www.who.int/bulletin/volumes/86/10/07-046128-ab/en/ (last access: 7 November 2020); NIH – https://www.nimh.nih.gov/health/statistics/what-is-prevalence.shtml (last access: 7 November 2020 ).
N: 1. It comes from french prévalence and this comes from Medieval Latin praevalentia meaning “superior force”. It was incorporated in the 1590s. The Classic Latin praevlere means “to be more able”. The prefix prae- means “before” and the verb valere means “to have power”. This verb comes from the PIE root wal-, meaning “to have power”. The meaning of “condition of being general or widespread” is from 1763.
2. The proportion of a population who have a specific characteristic in a given time period.
3. Prevalence is based on both incidence and duration of illness. High prevalence of a disease within a population might reflect high incidence or prolonged survival without cure or both. Conversely, low prevalence might indicate low incidence, a rapidly fatal process, or rapid recovery.
4. Prevalence rather than incidence is often measured for chronic diseases such as diabetes or osteoarthritis which have long duration and dates of onset that are difficult to pinpoint
5. Do not substitute prevalence with incidence. Prevalence and incidence are frequently confused. Prevalence refers to proportion of persons who have a condition at or during a particular time period, whereas incidence refers to the proportion or rate of persons who develop a condition during a particular time period. So prevalence and incidence are similar, but prevalence includes new and pre-existing cases whereas incidence includes new cases only. The key difference is in their numerators.
S: 1. OED – https://www.etymonline.com/search?q=prevalence (last access: 4 November 2020). 2. NIMH – https://www.nimh.nih.gov/health/statistics/what-is-prevalence.shtml (last access: 4 November 2020). 3 to 5 CDC – https://www.cdc.gov/csels/dsepd/ss1978/lesson3/section2.html (last access: 4 November 2020).
SYN:
S:
CR: coronavirus, COVID-19, incidence, virus.
