Measles is also referred to as which of the following?

Measles is commonly referred to as the "first disease." This term stems from historical classification systems used to categorize the common childhood exanthems (rashes). In this classification, diseases such as measles (first disease), scarlet fever (second disease), rubella or German measles (third disease), and chickenpox (fourth disease) were distinguished based on their clinical presentations and epidemiological characteristics.

Understanding these historical terms helps in the study of infectious diseases and provides context to the evolution of pediatric medicine and terminology. The term "first disease" particularly emphasizes the prominence and impact of measles in pediatric infectious diseases historically. In contrast, the other terms refer to different diseases that do not pertain to measles.