Measles (Rubeola)
Reportable by Laboratories and ProvidersAbout this Reportable Disease
Infectious Agent: Measles is a virus belonging to the Morbillivirus genus within the Paramyxoviridae family. The virus is a single-stranded, enveloped RNA virus. Measles is a highly contagious viral infection that spreads through the air via respiratory droplets from infected individuals.
Description of Illness: The incubation period for measles averages 11–12 days from exposure to onset of prodrome; rash usually appears approximately 14 days after exposure. Prodromal symptoms can include fever, with temperature ≤40.6°C (≤105°F); conjunctivitis; coryza (i.e., runny nose); cough; and small spots with white or bluish-white centers on an erythematous base appearing on the buccal mucosa (Koplik spots). A characteristic red, blotchy (maculopapular) rash appears 3–7 days after onset of prodromal symptoms. The rash begins on the face and subsequently becomes generalized to the trunk and extremities and typically lasts 4–7 days.
Current Cases
Interactive Disease Data
Laboratory Reporting for this Disease
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Measles Case Report Form | TDH |
Information about this Reportable Disease for Healthcare Providers
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TNHAN Measles |
Information about this Reportable Disease for the Public
Measles is a highly contagious viral infection that causes a red, blotchy rash which commonly appears on the face and behind the ears, spreading down the chest and back to the feet, arms, and legs. It usually affects babies and young children, but even in previously healthy children, measles can cause serious illness requiring hospitalization. Fortunately, it is easily preventable through vaccination.
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Additional Guidance
This Page Last Updated: February 20, 2026 at 1:51 PM