Measles: Symptoms, Causes, Treatment, and Prevention

Overview

Measles is a highly contagious viral infection that primarily affects children but can occur at any age. It is caused by the rubeola virus and spreads through respiratory droplets when an infected person coughs or sneezes. Despite the availability of a safe and effective vaccine, measles remains a significant global health concern.

Who Does Measles Affect?

Measles can affect individuals of all ages, but it is most common in:

• Unvaccinated children under 5 years old
• Adults who have not been vaccinated or previously infected
• People traveling to areas with ongoing measles outbreaks
• Individuals with weakened immune systems, even if vaccinated

Prevalence

According to the World Health Organization (WHO):

• Measles cases surged nearly 80% worldwide in 2022 compared to 2021.
• In 2021, an estimated 128,000 people died from measles, mostly children under 5.
• The U.S. saw a 18% increase in measles cases in 2023, with outbreaks linked to unvaccinated travelers (CDC).

Symptoms

Measles symptoms typically appear 10–14 days after exposure and develop in stages:

Early Symptoms (First 2–4 Days)

• High fever (often spiking to 104–105°F / 40–40.5°C)
• Cough (dry, persistent)
• Runny nose (coryza)
• Red, watery eyes (conjunctivitis)
• Sore throat
• Fatigue and general discomfort

Koplik Spots (2–3 Days After Early Symptoms)

Small white spots with bluish centers appear inside the mouth (cheek lining). These are a hallmark of measles but may be overlooked.

Measles Rash (3–5 Days After Early Symptoms)

• Begins as flat red spots on the face (often near the hairline) and spreads downward to the neck, trunk, arms, and legs.
• Spots may merge into larger red patches.
• Rash lasts 5–6 days before fading.
• Fever may spike again when the rash appears.

Note: A person with measles is contagious from 4 days before to 4 days after the rash appears (CDC).

Causes and Risk Factors

Cause

Measles is caused by the rubeola virus, a paramyxovirus. It spreads through:

• Direct contact with infected respiratory droplets (coughing/sneezing).
• Airborne transmission (virus can linger in the air for up to 2 hours).
• Touching contaminated surfaces (less common).

Risk Factors

Factors that increase the risk of measles include:

• Unvaccinated status: The MMR (measles, mumps, rubella) vaccine is 97% effective after two doses (CDC).
• International travel: Outbreaks are common in Europe, Africa, and Asia.
• Vitamin A deficiency: Increases severity, especially in developing countries.
• Weakened immune system: Due to HIV/AIDS, chemotherapy, or steroid use.
• Living in close quarters: Such as dormitories, military barracks, or refugee camps.

Diagnosis

Measles is diagnosed based on:

1. Clinical evaluation: A doctor will check for the characteristic rash, Koplik spots, and fever.
2. Laboratory tests: To confirm the diagnosis:
   • Viral culture: A throat or nasopharyngeal swab.
   • Serology: Blood test to detect measles-specific IgM antibodies.
   • PCR test: Detects viral RNA in urine or respiratory samples.
3. Exposure history: Recent travel or contact with infected individuals.

Early diagnosis is critical to prevent spread. The Mayo Clinic recommends testing for suspected cases, especially in outbreak areas.

Treatment Options

There is no specific antiviral treatment for measles. Care focuses on relieving symptoms and preventing complications:

Medications

• Fever reducers: Acetaminophen (Tylenol) or ibuprofen (avoid aspirin in children due to Reye’s syndrome risk).
• Vitamin A supplements: Recommended by the WHO for all children with measles, as deficiency worsens outcomes.
• Antibiotics: Only if a bacterial infection (e.g., pneumonia or ear infection) develops.

Home Care

• Rest and hydration (offer fluids like water, oral rehydration solutions, or broth).
• Humidifier to ease cough and sore throat.
• Dim lighting if eyes are sensitive.
• Isolate the patient to prevent spread (stay home for 4 days after rash appears).

Hospitalization

Required for severe cases, such as:

• Pneumonia or breathing difficulties.
• Encephalitis (brain inflammation).
• Dehydration or severe diarrhea.

Living with Measles

Recovery from measles typically takes 7–10 days. During this time:

• Monitor for complications: Watch for high fever, difficulty breathing, or confusion.
• Stay hydrated: Offer small, frequent sips of fluids.
• Rest: Limit physical activity until fever subsides.
• Skin care: Keep the rash clean and dry; avoid scratching to prevent infection.
• Nutrition: Offer soft, easy-to-digest foods (e.g., soups, applesauce).

Prevention

The MMR vaccine is the most effective way to prevent measles. The CDC recommends:

• First dose: 12–15 months old.
• Second dose: 4–6 years old (or at least 28 days after the first dose).
• Catch-up vaccination: For unvaccinated older children and adults (especially college students, healthcare workers, and international travelers).

Additional Prevention Tips

• Avoid contact with infected individuals.
• Wash hands frequently with soap and water.
• Cover coughs/sneezes with a tissue or elbow.
• If exposed and unvaccinated, the MMR vaccine may prevent illness if given within 72 hours. Immune globulin (IG) may help if given within 6 days (CDC).

Complications

Measles can lead to serious complications, especially in children under 5, adults over 20, and immunocompromised individuals:

Common Complications

• Ear infections: Affect ~1 in 10 children with measles (NIH).
• Diarrhea: Can lead to dehydration.
• Pneumonia: The most common cause of measles-related death (1 in 20 cases).

Severe Complications

• Encephalitis: Brain swelling (1 in 1,000 cases), which can cause seizures, deafness, or intellectual disability.
• Subacute sclerosing panencephalitis (SSPE): A rare, fatal brain disease occurring 7–10 years after infection.
• Pregnancy complications: Miscarriage, preterm labor, or low birth weight.

When to Seek Emergency Care

Key Takeaways

• Measles is preventable with the MMR vaccine.
• Early symptoms mimic a cold but progress to a characteristic rash.
• Complications can be life-threatening; seek care for warning signs.
• Isolate infected individuals to prevent outbreaks.

References

• Centers for Disease Control and Prevention (CDC)
• World Health Organization (WHO)
• Mayo Clinic
• National Institutes of Health (NIH)