Disease
Measles
Rubeola: 3 C's, Koplik spots, descending rash
High-yield clue
Cough, coryza, and conjunctivitis (the 3 C's) with Koplik spots preceding a face-to-body maculopapular rash is the classic measles clue.
Overview
A highly contagious viral exanthem, studied for its prodrome, pathognomonic Koplik spots, characteristic rash progression, and extreme transmissibility.
Classification
- Viral exanthem syndrome
- Measles morbillivirus (paramyxovirus)
- Airborne, very high transmissibility
- Vaccine-preventable
Lab & identification clues
- Koplik spots on buccal mucosa vocabulary
- Measles IgM serology concept
- Rash begins at hairline/face then descends
Associations
- Airborne spread with roughly 90% secondary attack in susceptibles
- At-risk: unvaccinated, infants, malnourished
- Complication vocabulary: pneumonia, encephalitis, SSPE
- Vitamin A deficiency association
Commonly confused with
- Rubella
- Roseola (HHV-6)
- Scarlet fever
Frequently asked questions
What is Measles?
A highly contagious viral exanthem, studied for its prodrome, pathognomonic Koplik spots, characteristic rash progression, and extreme transmissibility.
What is the high-yield clue for Measles?
Cough, coryza, and conjunctivitis (the 3 C's) with Koplik spots preceding a face-to-body maculopapular rash is the classic measles clue.
What is Measles associated with?
Measles is associated with Airborne spread with roughly 90% secondary attack in susceptibles; At-risk: unvaccinated, infants, malnourished; Complication vocabulary: pneumonia, encephalitis, SSPE; Vitamin A deficiency association.
What is Measles commonly confused with?
Measles is commonly confused with Rubella, Roseola (HHV-6), and Scarlet fever.
Original student-study summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment, dosing, or specimen-handling guidance.