Rash fever, often referring to **Measles** (Rubeola), is a highly contagious viral infection caused by the measles virus. It primarily affects unvaccinated individuals, especially children, worldwide and is characterized by a distinctive red rash and high fever. It remains a significant health threat in areas with low vaccination rates.
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Measles has been documented for centuries, with the first clear description by Persian physician Rhazes in the 9th century. Historically, it was a common and severe childhood disease responsible for widespread epidemics and significant mortality. The development of the measles vaccine in the 1960s revolutionized public health, dramatically reducing its incidence and impact globally.
Measles spreads primarily through the air via respiratory droplets when an infected person coughs or sneezes. The virus can remain active in the air or on infected surfaces for up to two hours. It is extremely contagious; 9 out of 10 susceptible people exposed to an infected person will contract the disease, making it one of the most infectious human viruses.
Contagious Period: Varies by disease
Local health department information and state-specific prevention guidance
Our AI-powered surveillance continuously monitors rash fever activity across Arizona. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.
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For official state health alerts, vaccination locations, and public health guidance specific to Arizona, visit your state health department's website.
Whether you live in Arizona or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.
Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.
Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.
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Trusted information from leading health organizations
Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-07-18
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